KillerSloth

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

Localmotion

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?

wjwerdna

get an alignment and check the brakes first

4Crawler

iTrader: (3)

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?

KillerSloth

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)

4Crawler

iTrader: (3)

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.

KillerSloth

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?

KillerSloth

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.

4Crawler

iTrader: (3)

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

CJM

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

KillerSloth

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

KillerSloth

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

4Crawler

iTrader: (3)

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.

apalmer1

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.