Driveline vibration Tsb out

Does anyone know if the leaf springs on the new TSB (T-SB-0008-14) replace all applicable springs with a 4-pack? Or are some still a 3-pack?

Part numbers in question are:
48210-04580
48210-04590
48210-04650
48210-04660
48210-04670
48210-04680

48220-04220
48220-04230
48220-04290
48220-04300
48220-04310
48220-04320

 

Did you read the tsb... Standard ride = 2+1. Firm ride = 3+ 1

 

To answer your question, yes. It does not specifically say in the TSB that standard ride = 2+1, that is why I asked. So are you assuming that standard ride = 2+1 because firm means 3+1 based on past literature? I am trying to figure out how to get the firm ride suspension since my dealer is very particular on following the VIN and since the TSB for any "firm ride suspension" stops at 2011 model year.

 

Yes firm ride = the 3+1 pack

Bitch enough and they will do it.

 

dropped mine off at the dealer today and they said they will have the parts overnighted. I requested the firm leaf spring...if I don't get em no big deal I was planning on lifting it in the near future anyhow. Got sent home in a RAV4 which is actually pretty convenient because we have been thinking about replacing my wife's car with one. I will update you all when i get the truck back

 

Mine is at the dealer and they are getting everything ordered to fix. I have a 2012 with the 3+1 so I don't know what will come of a new leaf pack, but as long as I get the vibe gone I will be happy.

 

Did a little more reading on the TSB and it states that if the truck has options CW, OF, OC, or PY then it should have the "firm ride suspension". From what I could get with a little research is the CW is Baja Edition, OF (???), OC is Off Road, and PY is Sport. So, considering mine is an Off Road and assuming my option codes are correctly translated, my truck should have a 3+1 leaf pack. I wonder why they don't from the factory? Any insight on this?

 

They probably over looked it.... as all tacos made past october 2013 have the 3+1 pack.

Either way it made it real easy for me to get the 4 leaf pack on my TRD off road. i just factored in the extra lift and told them the leafs to order as i was under my truck at the dealership doing the measurements with the head service mechanic that had no idea what he was doing.

 

And maybe new U-bolts are needed?

Jesse

 

I'll post this here and you guys make of it what you will.

I slapped a pair of Timbren bumpstops on this stock rear suspension, the 4-leaf tow package SR5 pack with the Baja Bilstein 5160's added, and the vibe that was very severe at 18-22 mph WHEN TOWING went away.

After Timbrens, the vibration is very slight. I noticed an immediate difference. So, doesn't that point to axle wrap as the problem for my truck?

The rear springs are so weak the trailer puts the Timbren bumpstops right against the frame when I put my foot into it to accelerate, which is natural when accelerating, the rear end will squat down. So there is no "hop".

I don't know the physics of it, all I know is the vibe decreased dramatically immediately and it's food for thought. I also torqued the living daylights out of the stock Ubolts after the Timbren install (since I didn't have a torque wrench I just tightened them as much as I could).

Just curious about opinions on why the dramatic decrease in the vibe . . . . .

 

I agree that this may be an axle wrap issue. I think this could be why the TSB has spring packs with different wedges. One way to offset the effects of axle wrap is to point the pinion nose down to help compensate for the rise in pinion angle on acceleration.

 

This IS a combination of axle wrap and driveline angles.

The fact that the vibration gets worse under heavier acceleration points to axle wrap. but also the fact that we have a very loose center carrier, and with the stock center u joint at a 2-3* angle it puts a side load on the carrier bearing causing the cyclic vibration.

By moving the transmission down, putting a somewhat beefier leaf pack and caster wedge to lower the pinion from the fame (increasing its angle to match the slightly reduced angle of the transmission u joint) we get a center u joint thats almost at zero which significantly reduces the side loading on the rubbery center carrier.

the ONLY thing that doesnt make sense in this tsb is why they would consider it ok to have the center u joint close to a 0* while matching the u joint angles at the transmission and pinion but keeping the those 2 u joints out of phase by 90*

 

So just got a call from my dealer, truck has been there since early Monday morning, they went through the TSB procedures and still felt the vibe after the steering wheel bushing and installing the new mounts. Told me they are installing new leaf springs and U-bolts Friday, hopefully I have it back Saturday.

For reference I have a 2012 TRD Sport that has (had) the 3+1 leaf pack. Hopefully the new leafs add some beef to the back of this truck. Anyone who got the new leaf pack notice any rear lift? I know one guy on here stated 3/4". Wondering if I will have to lift the front if its bad enough of a rake.

 

I've read here and there that just the fact that the Tacoma has the outboard mounted rear shocks contributes to axle wrap. Supposedly an inboard mounted rear shock like Chevy and Ford uses sitting there in the middle of the rear axle is a more stable (is that the right word?) configuration. I guess like said above it's the combination factor on the driveline . . . . .

Toyota chooses to mount the rear shocks outboard for offroading purposes. We really don't want a shock mount sticking out there in the middle of the axle to get picked off by rocks. The outboard mounted shocks IMO is why Jeep and Toyota are the offroad choices of people in Colorado. Lots of rocks, hence why they're called the Rocky Mountains. Narrow trails, rocky trails, Jeep or Tacoma is your top two choices. I never see an S10, a Ranger, a Dakota on the rough rocky trails, only Jeeps or Tacomas.

 

lol... no... my chevy 2500hd has horrible axle hop.... but axle wrap is non existent... you know why, cus the leaf packs are beefie as hell.... shocks and shock placement do not prevent or eliminate axle wrap... a proper leaf pack does.

 

Ugh. I hope that is not my truck's fate.

 

3+1 already is the firm ( tsb ) pack , no ?

 

Sorry yeah they are for sure.

Maybe I am confusing myself more than necessary here. They insisted new leafs had to go on the truck, but if I had the 3+1 already what would they have ordered new from the truck? Can someone with more knowledge than me on this help me out here.

 

Today was the second full day my truck has been at the dealer for the TSB, and so far the parts still haven't been ordered.

Just spoke with them, and apparently Toyota has them doing a lot more than just taking the simple measurements in the TSB. They have the mechanic taking test drives in both 4wd and 2wd with the techstream connected and sending them data. (What kind of data....I have no idea)

Not sure what any of that has to do with driveline angles, and neither does my Service Manager. Sounds to me like Toyota has them jumping through hoops for nothing.

 

That was done when I brought the truck back on the second day I owned it....right before they said it was a "characteristic of the vehicle" and I started the arbitration process.