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Discussion Starter · #1 ·
After installing my SPOA and the RRO TCase mounts I am having terrible vibrations

On 1st gear they appear from 3500rpm to 4500 rpm
On 2th gear they appear from 2500rpm to 3000 rpm
3th gear no prob
4th and 5th no prob

This is either on 2wd or 4wd. It also happens when shifting down

Have I tighthen the tcase mounts to much and got a different angle at the tcase????

thanks in advance for your help

Rui Alberto Sá Freitas
Livramento de Cima
1º Impasse da estrada do garajau n.º 9 e 11
9125-066 Caniço
Ilha da Madeira
PORTUGAL
 

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475 Posts
rui--i would be checking the u-joints & the pinion angles
you may need joints or shims---oldzuki

88 spoa samurai/weber/isky
97 sidekick sport
those that can samurai those that can't ?
 
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Discussion Starter · #3 ·
Did you line up the match marks on your driveshafts when you put them back in? They are balanced and are supposed to be installed one way only. I have seen a couple of old posts from people saying they actually got less vibration with their shafts 90 degrees out, but when I bought my first samurai, I had a terrible vibration in first gear and a moderate vibration in second. It went away completely when I clocked the driveshafts correctly.

 
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Discussion Starter · #4 ·
One question: Does the Transfer case lever WOBBLE around terribly when it does this?????
If so, you got what I had! It was awful! It also happed right after I did my spring over. I tried the driveshaft spacers, and it didn't help. My U joints were less than 6 months old. So......we replaced the rear driveshaft with a beefy CV unit from Arizona Driveline....and Whammo! No more vibration!!! I do believe that my pinion needs to be angled up some more now too...but we haven't gotten to that yet!
Hope this helps

Andy Feingold
88.5 Samurai, SPOA,Rancho springs, Rocklobster, full cage, Schroth Harness belts, EZ locker, 32x10.50 Swampers, on board air, Weber, header etc...
 

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If you moved your rear pinion angle up when you installed the SOA than it will shake under acceleration and deceleration until you get a CV shaft! I also read a post on here that said if you install the spring perches ad different angles it will cause some freaky things to. Good Luck!

Rodney C
1985 CJ7,302 V8,T18,D20,SOA,Shackles Reversed, 35" BFG AT's, Fiberglass Tub & Front End...
1990 Samurai,87 drive line,SOA+2.5" Add-A-Leaf,4.16's,5.12's,33" BFG's Mud's,Pony Carb...
 
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Discussion Starter · #6 ·
I used RRO warp Around perches so I just weld them to the axles. I didn't mess with the pinnion angle.
The driveshafts are aligned. Should I try them unaligned ??

Rui Freitas

Rui Alberto Sá Freitas
Livramento de Cima
1º Impasse da estrada do garajau n.º 9 e 11
9125-066 Caniço
Ilha da Madeira
PORTUGAL
 

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1,135 Posts
Measure your pinion angles first! What did you use for the new T-case bushings?
Poly or Rubber? the bushings may be a little taller than the old bushing creatng a
different angle on the T-case.

Wayne

 
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Discussion Starter · #8 ·
I used RRO T-Case bushings, I might have over tigthen them...
How do I measure pinnion angles ??

Rui Alberto Sá Freitas
Livramento de Cima
1º Impasse da estrada do garajau n.º 9 e 11
9125-066 Caniço
Ilha da Madeira
PORTUGAL
 
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