We just got done lifting my girlfriends '98 Tacoma (3 inches) and when you slow down the driveline (im assuming it's that) starts vibrating. I think the angle on the drive line is getting to severe. What can I do to fix this problem?
I'm new to the whole lifting thing, I have only lowered a few trucks... lol, will probably get flamed for that... haha

 

im pretty sure it shouldn't be the drive line angle. you have a yoke slip eliminator. Are you sure it isn't the brakes?

 

get an alignment and check the brakes first

 

Check the driveline angles and correct if needed:
- http://www.4crawler.com/4x4/ForSale/Shims.shtml#FAQ1

Vibration on deceleration might be due to some worn/loose parts (u-joint, slip yoke, pinion flange, etc.) or could be due the the pinion flange angle being a little too low. Reason being that the pinion flange tips up under load and down under deceleration. So if a little low at rest, under load it comes up into a reasonalble alignment, but under decel. it drops too low and vibrates.

How was the lift in the rear accomplished?

 

The lift was done with a block.

It didn't have any problem before so thats why I was thinking driveline... It seems kind of out of whack... I'll check that website mentioned.. thanks for the quick replies.

Oh, and I was going to have her take it to get it aligned tomorrow.

Whoops, and forgot to mention it's an extended cab so it has a carrier bearing (dont know if the regular cabs have them)

 

If the block was flat (i.e. no taper) then that is the likely cause of the problem. As you lift the rear end, the driveshaft angle changes approx. 1 degree per inch of lift. The pinion needs to be tipped up an equal amount to compensate. Otherwise, it'll end up too low and cause decel. vibrations. On a rig w/o a center bearing (and a u-joint driveshaft) there is no need to change pinion angle with a block lift:
- http://www.4crawler.com/4x4/CheapTri...FixingProblems

Problem is the place selling the block lift has no way of knowing what type of rear driveshaft you have.

 

Ok, thanks. The blocks were flat, so I will need about a 3 degree shim?

Is there anyone that has done a 3 inch lift before that knows exactly what size shim to use?

 

Ok, so I'm kind of lost on the whole angling thing. I will try to search more, but could you dumby it down for me? What exactly do I need to measure to get the angle?

If anyone has done a 3 inch block lift on a extended cab Tacoma could you please let me know what size shim you used?

The guy at the local offroad shop said it will probably be around 4 degrees, but I would like to confirm this before I spend $30 on the shim.

 

See:
- http://www.4crawler.com/4x4/CheapTri...n-Measurements

 

I would suggest you dump the blocks alltogether and find yourself an add a leaf or leafpack for the rear.

 

We have already spent more then we want to... and wouldnt I still need to put a shim in there?

 

Ok, so I got a better angle finder...

Here are my measurements: Transmission; 3.5 d(egrees), First shaft; 1.5 d, Second shaft; 13 d and Pinion; 6 d. One way I found on the internet says I need a 3.5 d shim using these dimensions, and with your way I'm still not sure because of the fact that since the angle of the pinion changes so does the driveline... So If I put in a 6 degree block it would be too far (since you said you put in an 8 but ended up using a 5).

It seems like 4 d would work out good, what do you think?

I'm sorry for being such a hastle, just want to get this right so I dont have to buy more parts

 

SInce the lower half of the shaft is at a 13 degree angle and the pinion is tipped up 6 degrees, you have a 7 degree difference, you want 1-2 degrees at rest. So, assuming around a 4' long shaft (lower section), you would see the shaft angle lessen 1 degree for every ~4 degrees of pinion tilt:
- http://www.4crawler.com/4x4/ForSale/Shims.shtml#FAQ1
so a 4 degree shim would leave you at 10 degrees on the pinion (6+4=10), the shaft would end up at 12 deg. (13-1=12) and leave you at a ~2 degree static angle.

 

If you have a two peice rear driveline lower the carrier bearing with some washers, about a half inch helps when your getting driveline vibrations from a small lift. It isnt as appropriate as using axle shims but it does work.