Mike "Wuzzy121". Rest in peace, brother

Go Back   Tacoma World Forums > Tacoma Discussion > 2nd Gen. Tacomas

Notices

Is this a simple question ?

Reply
 
Thread Tools Search this Thread
Old 12-19-2007, 08:26 PM   #1
StinkyTaco [OP] StinkyTaco is offline
Junior Member
StinkyTaco is on a distinguished road
Joined: Dec 2007, #3896
Location: socal-santa monica
Posts: 12
StinkyTaco's Tacoma Gallery
Is this a simple question ?

On the 2008 2 wheel drive with the locking diff. it says not to drivre over 5 MPH. Why can't you just peddle it through the gear box ?
  Reply With Quote
Old 12-20-2007, 10:36 AM   #3
nd nd is offline
Radical Town. It's a hell of a place!
nd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these parts
 
nd's Avatar
Name: Nate
Joined: Mar 2007, #1047
Location: Greenville, SC
Age: 32
Gender: Guy
Posts: 12,740
nd's Tacoma Gallery
i could be wrong, but i think it is because cornering or turning at high speeds can be dangerous with the back locked. The binding can cause the truck to flip easier. not sure if this is the reason but it made sense when it was explained to me
  Reply With Quote
Old 12-20-2007, 10:51 AM   #4
Zoom-Zoom
gdawg25 has much to be proud ofgdawg25 has much to be proud ofgdawg25 has much to be proud ofgdawg25 has much to be proud ofgdawg25 has much to be proud ofgdawg25 has much to be proud ofgdawg25 has much to be proud ofgdawg25 has much to be proud ofgdawg25 has much to be proud ofgdawg25 has much to be proud of
 
gdawg25's Avatar
Joined: Oct 2006, #136
Location: Victoria, BC
Age: 32
Gender: Dude
Posts: 1,030
gdawg25's Tacoma Gallery
Also, cornering with the locker on can cause damage to the diff. While cornering the tires rotate at different speeds - the outside tire rotates faster. So when you lock the diff, your tires are unable to rotate at different speeds. That's why you shouldn't go more than 5mph with the diff locked.
  Reply With Quote
Old 12-20-2007, 10:56 AM   #5
Big Cat Chew Toy
GTiVR6r is on a distinguished road
 
GTiVR6r's Avatar
Joined: Sep 2007, #2805
Location: Carpentersville, IL
Age: 46
Posts: 212
GTiVR6r's Tacoma Gallery
Then why doesn't Toyota build a failsafe circuit into the locking diff system to dis-engage at speeds over 6 MPH???

If a Toyota car's rear defoster turns off automagically after 10 minutes, then the electronic diff should dis-engage when speeds reach 6 MPH.
  Reply With Quote
Old 12-20-2007, 12:25 PM   #6
Old & Forgetful
Janster is one of the sharper tools in the shedJanster is one of the sharper tools in the shedJanster is one of the sharper tools in the shedJanster is one of the sharper tools in the shedJanster is one of the sharper tools in the shedJanster is one of the sharper tools in the shedJanster is one of the sharper tools in the shedJanster is one of the sharper tools in the shedJanster is one of the sharper tools in the shedJanster is one of the sharper tools in the shedJanster is one of the sharper tools in the shed
 
Janster's Avatar
Name: Jandy
Joined: Mar 2007, #1138
Location: Lancaster, PA
Age: 46
Gender: Female
Posts: 12,982
Janster's Tacoma Gallery
Quote:
Originally Posted by ndcouch View Post
i could be wrong, but i think it is because cornering or turning at high speeds can be dangerous with the back locked. The binding can cause the truck to flip easier. not sure if this is the reason but it made sense when it was explained to me
I understand the binding aspect of it....

The fact the 2WD guys can engage the locker anytime and the 4WD guys can't - is the confusing part to me. I mean - I can't imagine what they were thinking. Is there really any difference ?
  Reply With Quote
Old 12-20-2007, 05:43 PM   #7
nd nd is offline
Radical Town. It's a hell of a place!
nd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these partsnd is infamous around these parts
 
nd's Avatar
Name: Nate
Joined: Mar 2007, #1047
Location: Greenville, SC
Age: 32
Gender: Guy
Posts: 12,740
nd's Tacoma Gallery
Quote:
Originally Posted by Janster View Post
I understand the binding aspect of it....

The fact the 2WD guys can engage the locker anytime and the 4WD guys can't - is the confusing part to me. I mean - I can't imagine what they were thinking. Is there really any difference ?
that i'm not sure about. that confuses me too. i dont know why it would be ok for a 2wd to engage the locker, but a 4x4 in 2wd cant. No idea what toyota was thinking when they decided that made sense.... You're one of our resident wheelers, with all the answers, i'm actually surprised you dont know
  Reply With Quote
Old 12-20-2007, 07:39 PM   #8
Carolina Alliance: Lead, follow, or get the hell outta my way
tacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shed
 
tacomaman06's Avatar
Name: Will
Joined: May 2007, #1475
Location: York,South Carolina
Age: 35
Gender: Male
Posts: 26,352
tacomaman06's Tacoma Gallery
drive with the diff locked as fast as you want to, nothing bad will happen. just dont run it locked on pavement, as that is where there would be too much strain on it and something may break, or you could wreck. i've had my diff locked and ran it up around 40-45 mph on dirt/grass and it was fine......kinda fun actually.

toyota only says dont run it over 5 mph while its locked for liability reasons....basically to save their own ass.
  Reply With Quote
Old 12-20-2007, 08:05 PM   #9
StinkyTaco [OP] StinkyTaco is offline
Junior Member
StinkyTaco is on a distinguished road
Joined: Dec 2007, #3896
Location: socal-santa monica
Posts: 12
StinkyTaco's Tacoma Gallery
Quote:
Originally Posted by tacomaman06 View Post
drive with the diff locked as fast as you want to, nothing bad will happen. just dont run it locked on pavement, as that is where there would be too much strain on it and something may break, or you could wreck. i've had my diff locked and ran it up around 40-45 mph on dirt/grass and it was fine......kinda fun actually.

toyota only says dont run it over 5 mph while its locked for liability reasons....basically to save their own ass.
thats what i thought, thanks
  Reply With Quote
Old 12-21-2007, 03:24 AM   #10
Senior Member
ERdept is a name known to allERdept is a name known to allERdept is a name known to allERdept is a name known to allERdept is a name known to allERdept is a name known to all
Joined: Oct 2007, #3187
Location: Kali
Age: 48
Gender: Male
Posts: 996
ERdept's Tacoma Gallery
Quote:
Originally Posted by tacomaman06 View Post
drive with the diff locked as fast as you want to, nothing bad will happen. just dont run it locked on pavement, as that is where there would be too much strain on it and something may break, or you could wreck. i've had my diff locked and ran it up around 40-45 mph on dirt/grass and it was fine......kinda fun actually.

toyota only says dont run it over 5 mph while its locked for liability reasons....basically to save their own ass.
OK, but I have friends who are into drag racing. They've got built hot rodded but streetable Camaro's and Roadrunners.

They install Posi to prevent it from "peg legging", where only one wheel turns, and the other is left to slip.

They want both wheels to turn. They're exclusively on the street. So, how come they/their cars can do it.

I see them go around corners and all I see is chirping. Not arguing here, just trying to get to the bottom of this.
  Reply With Quote
Old 12-21-2007, 06:58 AM   #11
Carolina Alliance: Lead, follow, or get the hell outta my way
tacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shed
 
tacomaman06's Avatar
Name: Will
Joined: May 2007, #1475
Location: York,South Carolina
Age: 35
Gender: Male
Posts: 26,352
tacomaman06's Tacoma Gallery
Quote:
Originally Posted by ERdept View Post
OK, but I have friends who are into drag racing. They've got built hot rodded but streetable Camaro's and Roadrunners.

They install Posi to prevent it from "peg legging", where only one wheel turns, and the other is left to slip.

They want both wheels to turn. They're exclusively on the street. So, how come they/their cars can do it.

I see them go around corners and all I see is chirping. Not arguing here, just trying to get to the bottom of this.
the only thing i can really say here is dirt and grass give alot more that pavement or asphalt does. plus it may be a big variance with their tires.....all terrrain tires on a truck are way different that slicks or street tires on a car set up for racing.
  Reply With Quote
Old 12-21-2007, 09:47 AM   #12
Living vicariously through myself
mjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shed
 
mjp2's Avatar
Name: Milton Juevos Portimous II
Joined: Feb 2007, #924
Location: NJ
Gender: Dude
Posts: 17,081
mjp2's Tacoma Gallery
Quote:
Originally Posted by ERdept View Post
OK, but I have friends who are into drag racing. They've got built hot rodded but streetable Camaro's and Roadrunners.

They install Posi to prevent it from "peg legging", where only one wheel turns, and the other is left to slip.

They want both wheels to turn. They're exclusively on the street. So, how come they/their cars can do it.

I see them go around corners and all I see is chirping. Not arguing here, just trying to get to the bottom of this.
Posi != locker. A posi is a limited slip, which means there are friction plates/springs/stuff to encourage both wheels to turn at the same rate, but as the axle shafts on either side of the differential are not mechanically bound to one another they do have the ability to turn at different rates.

I believe the 2wd Tacomas have a limited slip rear, not a locker.

The TRD offroad package comes with the electronic locker which can be turned on and off. Off = open differential. On = true locked differential, which functions the same as a spool. (spools have no spider gears -- the ring gear drives a simple shaft into which the two axles shafts are inserted. Virtually unbreakable offroad, but terrible on dry pavement.

Standard lockers (Detroit, for instance) try to balance offroad and onroad performance by locking and unlocking based on the forces exerting the most leverage on the differential. If the driveline is applying power (acceleration), the locker engages and the differential locks solid. If the ground is applying power (coasting), the teeth disengage and the differential opens. The trick with this is to know how and when things will lock up and anticipate it or your vehicle will do some weird things. Basically, let off the gas around turns and apply power once you're straight and things will be fine.

As far as asking Toyota to automatically disengage the locker above 5mph, bite your tongue! It's bad enough I have to hack the wiring to get it to engage in 4wd-hi and 2wd.
  Reply With Quote
Old 12-21-2007, 01:09 PM   #13
Devout Atheist
piercedtiger is one of the sharper tools in the shedpiercedtiger is one of the sharper tools in the shedpiercedtiger is one of the sharper tools in the shedpiercedtiger is one of the sharper tools in the shedpiercedtiger is one of the sharper tools in the shedpiercedtiger is one of the sharper tools in the shedpiercedtiger is one of the sharper tools in the shedpiercedtiger is one of the sharper tools in the shedpiercedtiger is one of the sharper tools in the shedpiercedtiger is one of the sharper tools in the shedpiercedtiger is one of the sharper tools in the shed
 
piercedtiger's Avatar
Name: Jon
Joined: Oct 2007, #3284
Location: B.F.E., NY
Age: 34
Gender: Male
Posts: 6,229
piercedtiger's Tacoma Gallery
Send a message via AIM to piercedtiger
Thanks for explaining Posi! I always thought it was the same as a locked axle.

I'm with Tacomaman. Trucks and cars have had lockers for years, but mostly for racers or offroaders who KNOW what to expect. Put one in a truck that any schmuck can buy without knowing how it works could spell trouble. Toyota doesn't want to get sued cuz some idiot locked up and power slid around a corner into a bus load of kids. Even Detroit lockers could do that from what I understand. Heard some guy talking about how he'd get on the gas going around a corner. The locker would engage with a BANG, scare the crap out of the people on the sidewalks, and light up the tires!

And I second the comment to bite your tongue about Toyota auto-disabling it above 6mph!! I've used mine at 35-45mph on snowy roads to help hold the truck straight. It would fishtail slightly in 4wd cuz my tires suck and one would spin. With the locker on at least both tires spun equally fast and the truck didn't try to break loose. There was lots of snow/slush on the roads so binding wasn't a problem. If toyota interfered then I'd have to disable yet another nanny system to do that.
  Reply With Quote
Old 12-21-2007, 01:09 PM   #14
StinkyTaco [OP] StinkyTaco is offline
Junior Member
StinkyTaco is on a distinguished road
Joined: Dec 2007, #3896
Location: socal-santa monica
Posts: 12
StinkyTaco's Tacoma Gallery
Quote:
Originally Posted by tacomaman06 View Post
the only thing i can really say here is dirt and grass give alot more that pavement or asphalt does. plus it may be a big variance with their tires.....all terrrain tires on a truck are way different that slicks or street tires on a car set up for racing.

some of my buddies that have full blown locker rear ends on their pre runners,
drive the shit out of em' on all types of road surfaces.
On tighter turns the tires chirps.

????????
  Reply With Quote
Old 12-21-2007, 01:47 PM   #15
LRH LRH is offline
Senior Member
LRH is on a distinguished road
Joined: Jul 2007, #2159
Location: GA USA
Posts: 303
LRH's Tacoma Gallery
Quote:
Originally Posted by StinkyTaco View Post
some of my buddies that have full blown locker rear ends on their pre runners,
drive the shit out of em' on all types of road surfaces.
On tighter turns the tires chirps.

????????
--------------------------------------------------------------------

These are still not (most likely) spools, but gear or clutch types that are not totally street friendly, but do allow some varying speeds between the L and R axles.
  Reply With Quote
Old 12-21-2007, 02:08 PM   #16
Living vicariously through myself
mjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shed
 
mjp2's Avatar
Name: Milton Juevos Portimous II
Joined: Feb 2007, #924
Location: NJ
Gender: Dude
Posts: 17,081
mjp2's Tacoma Gallery
Quote:
Originally Posted by StinkyTaco View Post
some of my buddies that have full blown locker rear ends on their pre runners,
drive the shit out of em' on all types of road surfaces.
On tighter turns the tires chirps.

????????
It they're running spools then they most likely beefed up the rest of the rear to handle the stress. With a spool, factory axle shafts will tend to load like a torsion bar when turning. When they unload (untwist) you'll hear the tires chirp. Thicker, stronger axle shafts will resist loading and will tend to squeal around turns more than chirp. They'll also last a whole lot longer.

Anything can be made to survive if it's beefed up enough.

If they're running an automatic locker (Detroit, for instance), the rest of the rear end will be more likely to hold together without needing excessive building. They'll also tend to chirp more than squeal as the locker engages and disengages.
  Reply With Quote
Old 12-21-2007, 03:08 PM   #17
Carolina Alliance: Lead, follow, or get the hell outta my way
tacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shedtacomaman06 is one of the sharper tools in the shed
 
tacomaman06's Avatar
Name: Will
Joined: May 2007, #1475
Location: York,South Carolina
Age: 35
Gender: Male
Posts: 26,352
tacomaman06's Tacoma Gallery
Quote:
Originally Posted by mjp2 View Post
Posi != locker. A posi is a limited slip, which means there are friction plates/springs/stuff to encourage both wheels to turn at the same rate, but as the axle shafts on either side of the differential are not mechanically bound to one another they do have the ability to turn at different rates.

I believe the 2wd Tacomas have a limited slip rear, not a locker.

The TRD offroad package comes with the electronic locker which can be turned on and off. Off = open differential. On = true locked differential, which functions the same as a spool. (spools have no spider gears -- the ring gear drives a simple shaft into which the two axles shafts are inserted. Virtually unbreakable offroad, but terrible on dry pavement.

Standard lockers (Detroit, for instance) try to balance offroad and onroad performance by locking and unlocking based on the forces exerting the most leverage on the differential. If the driveline is applying power (acceleration), the locker engages and the differential locks solid. If the ground is applying power (coasting), the teeth disengage and the differential opens. The trick with this is to know how and when things will lock up and anticipate it or your vehicle will do some weird things. Basically, let off the gas around turns and apply power once you're straight and things will be fine.

As far as asking Toyota to automatically disengage the locker above 5mph, bite your tongue! It's bad enough I have to hack the wiring to get it to engage in 4wd-hi and 2wd.

awesome explanation mjp!!!!
  Reply With Quote
Old 12-24-2007, 07:05 AM   #18
Living vicariously through myself
mjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shedmjp2 is one of the sharper tools in the shed
 
mjp2's Avatar
Name: Milton Juevos Portimous II
Joined: Feb 2007, #924
Location: NJ
Gender: Dude
Posts: 17,081
mjp2's Tacoma Gallery
Thanks! Usually I'm good for little more than a snarky comment around here, but every now and then a topic comes up that I actually understand.
  Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Simple Question chasgrips45 Wheels & Tires 7 02-10-2011 08:20 AM
Simple Question kris77 2nd Gen. Tacomas 8 04-27-2010 03:53 AM
Simple question palicea 2nd Gen. Tacomas 1 02-03-2010 09:26 PM
simple question's. toni87 Lighting 3 01-13-2009 06:56 PM
Simple question? JahFtb 2nd Gen. Tacomas 8 12-19-2008 04:47 PM


Copyright © 2014 Tacoma Forum. Tacoma World is not owned by, or affiliated with Toyota Motor Corporation.