what size pinion shim did our cars have factory?
#1
what size pinion shim look at my gear pattern
I have been fighting gear whine with several sets of 4.10s. I hear alot of time the stock pinion shim works the best to start out with. my problem is that i sold my stock gears with the bearing and shim so I have no idea what shim I had originally. I wanna try a stock shim for starters so what have most of your stock rears had for the shim size? We have a .035 in it right now but I think it's a little deep. Is the stock size like a 25 or 30?
Last edited by mvvette97; 12-03-2008 at 09:03 PM.
#2
TECH Enthusiast
iTrader: (43)
The factory shim should allways stay with the rear end (I know it don't help you much now) but that only gets you ball park on correct pinon depth. wipe pattern, back lash, diff shims etc etc are factors controling pinon shim size. So the factory shim don't allways work out when you change gears. Some mfg's gears naturaly whine more than factory gears, so first question would be what mfg gears you been using.
#3
I have the AAM 4.10s. I had the mechanic do the install for me but to me he just hurried through it. I don't feel he done a good job since it makes alot of noise. I know he knows what to do because he has set up rears for years at the shop he works at and never had one make noise yet. I think he just didn't want to pull the pinion again to change the shim. I looked at the pattern and I thought it looked too deep.
Trending Topics
#13
TECH Apprentice
iTrader: (1)
Join Date: Oct 2005
Location: Norwich, NY
Posts: 324
Likes: 0
Received 0 Likes
on
0 Posts
every 8.5 truck and 7.5 I've worked on came with .35. The only time I wasn't able to use the stock shim was when i went from 3.73 in my ZR2's 8.5 to 4.56 gears. Had to increase the pinion shim to .42.
Looks like you need to change your shim. And if your backlash is 14 you need to increase the drivers side shim pack, and take away from pass.
Looks like you need to change your shim. And if your backlash is 14 you need to increase the drivers side shim pack, and take away from pass.
#15
11 Second Club
iTrader: (8)
Join Date: Jan 2002
Location: SILSBEE TX
Posts: 1,782
Likes: 0
Received 0 Likes
on
0 Posts
my .02' Johnny
#16
I am with WRD 1972, I would try with your peion shim to start with, I would work on backlash, 4-6 should be good with the AAM, but the AAM 2 cut gear set up with a differant pattern than the 5 cut gears, I can not find the link rite now do a search for AAM setup
my .02' Johnny
my .02' Johnny