TRD Sport LSD questions...

Correct.

 

And I just remembered that that front body harness is integrated with the big fuse box so fuck that. You're right, not even worth it

 

yeah nope. Pretty sure there is a FATTY fuse as well for the electric pump on the electric master cylinder.

 

The LSD on my ‘06 XRunner was bad ass! Had no problem laying down 2 patches...man I miss that truck. I’m hoping to find one in the next couple of years as my weekend toy/project.

 

Is an SR5 4X4 equipped the same as the TRD sport in regards to the different driving modes? I have a 2015 and I'm trying to see if buying a truetrac would make a big difference in my capabilities. I've already gotten it stuck once where a locker would have saved me, but I'm thinking maybe the truetrac could help as well?

 

It's open differential with brake assist. AKA ALSD. So no, no LSD.

 

All 2013's have open differentials. Correct, the OR has E-Lock to lock the diffs.

 

Yes, even with the OEM clutch driven LSD the wheels lock. I have no idea why people say that with the mechanical LSD if one wheel is off the ground you get no traction. You do, unless you have too much additive in the rear differential. Truetrac is gear driven, even better. Put a 2005-2008 TRD sport on Jack stands and leave one rear tire on the ground and lay under it, I dare you! It will get traction and take off when you put it in gear!

 

Trutrac is the shiznet I’ve got one an luv it. Would I rather have a selectable locker of course but for the price, smoothness of operation an set it an forget it can’t beat it.
It has tremendously increased my trucks abilities traction wise where I needed 4wd before I can go 2WD hassle free for the most part. No more peeling out at the boat ramp, spinning in wet grass etc.
You could go mechanical locker but there is a lot of noise associated with it for DD an somewhat unpredictable it wet conditions from things I’ve read..no personal experience there.

 

So according to you there's no difference between a locker and a limited slip

 

Never said that. A locker and mechanical LSD or 2 completely different differentials.

With LSD the wheel on the ground will only free spin so many times before the other wheel kicks in. A locker spools the diffential, there will be no free spin on either wheel. I think, this is a guess, people with OEM LSD diffential's just hammer down on the gas and don't pay attention to wheel spin.

If you stay steady, let the LSD engage, it's 'locked' then you hammer down. You can't expect to run 5000RPMS and have the clutches engage, bam! Locked!

 

You have one on the rear only? Is it possible to have front and rear?

 

They don't make a truetrac for the front. Currently I believe the only traction option for the front are lockers.

A member on here recently figured out tho how to use the Torsen Rear diff from a Scion with land cruiser gears in the front diff of a Tacoma which is pretty dope

 

OK, let's put this to bed once and for all about the 2005-2008 mechanical LSD!

Jesus, I spend waaaay too much time on my Tacoma, it's 11PM, lol!


Summary, I admit I am half right and half wrong. Going by wheeling experience, I'm right, going by pure technical aspects I am wrong.

I literally just did these experiments...

1. Placed floor Jack on rollers under the rear axle on the right side. Lifted the rear right tire off of the ground. Started the truck, put it in drive. The rear right tire spun freely, no movement from left rear tire, BUT, rear differential was making noises I didn't like. Like clutches trying to grab. I tried reverse. Same thing. I tried applying the brakes, right rear tire stopped. Tried emergency brake, right rear tire (as expected) kept turning. Left rear tire did not move.

2. Placed floor Jack on rollers under the rear axle on the left side. Lifted the left rear tire off of the ground. Put it in drive, the left rear tire free spin, truck did not move. I applied the brakes, truck did not move. I put the truck in park, applied the emergency brake in full, no tires moved. Put the truck in park. Applied emergency brake at half of the way down. Put the truck in drive, with the left rear tire off of the ground, axle resting on the Jack with rollers, the truck started to roll forward, both wheels spin at the same rate, but with the left rear tire in the air.

3. I used the same floor Jack on rollers, jacked up the left rear tire so that it was off of the ground several inches. I placed 2 2"x6"x 10' boards on top of each other, nailed together under the left rear tire. I placed a trash can weighted down with a weekends worth of cut up scrap wood at the end of the boards so they would not move. I Lowered the Jack just enough to where the left rear tire was resting on the 2"x6" boards to have some traction, but still pull the Jack along with it. I placed the truck in drive, at idle speed I let it run down the boards, when it got to the end of the boards the axle rested on the Jack with rollers. Once the left rear wheel was off the boards resting on the Jack on rollers, the truck kept going with the left rear tire free spinning for a couple of rotations, then the truck jerked and surged forward pretty quick and the Jack on rollers stayed in place for maybe another 10' and couldn't keep up and fell out, then left rear tire hit the ground. Scratched up my axle pretty good lol! Thought I broke the Jack, but I think it's fine.

In conclusion these are my findings....

At complete rest, like you parked your truck with your right rear wheel is in the air resting on the axle hanging off your driveway and go to bed, in the morning, your boned! Truck ain't moving!

At complete rest, like you parked your truck with your left rear wheel hanging off your driveway on the axle, then go to bed. In the morning, you will make it to work on time, apply emergency brake half way and although you will probably kill your axle housing dragging it along your concrete driveway until your left rear wheel gets to solid ground.

Now, the interesting part...

This is why I was so dead set in LSD working so well as a 'locker'when you drive correctly.

In test #3, with the truck rolling at idle speed consistently for the length of the boards, as soon as it reached the end of the boards and fell onto the Jack on rollers, the left rear wheel spinned a little faster than the right rear tire which was still moving at idle speed, then the truck kept going with the left rear tire off the ground now spinning at the same rate as the right rear tire.

So what I think is happening in my experience is that I keep the Rpms steady in situations where traction is sketchy, since both wheels are moving (key point, moving) at the same rate when one looses traction, both wheels have enough traction to engage the clutches, 'locking' the rear differential, which as long as I stay steady keeps me having traction on both wheels, then once I accelerate, the differential is still engaged and gives me traction until I let off the gas.

So again my apologies, I have been half right and half wrong, the effectiveness of the 2005-2008 mechanical LSD depends on you situation, like if your dumb enough to park with half your truck hanging off of a cliff, and your driving. Keep it steady, let the differential do it's job, don't park half off a cliff, you will be OK.

 

Just the rear, I believe there is no lsd for the front just lockers.

 

What he said, plus I don't think you would want LSD on the front, on sharp turns the difference in the tire rotations could engage the LSD, that wouldn't be good.

 

Engineers are smarter than that. Case in point, the Ford Raptor has a Torsen front diff (thats short for torque sensing and is a worm gear/worm wheel type LSD, in fact calling it an LSD is technically wrong because it allows no amount of wheel slip). Nobody sets the torque bias so that the LSD would engage in a regular turn, even if you you turned one wheel in a radius around the other.
I would love to have a Torsen front diff over my open one.

 

Good info bro, thanks!