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Ring & Pinion shims

Posted: Fri Nov 03, 2006 7:56 pm
by Bruce2
In talking to VW transaxle builders that see far more volume than I do, they have noted that in most cases the thickness of the pinion bearing shim is almost always the same.

For example, an old German mechanic trained by VW of Germany in the 50s told me that a G type 3.88 usually has a 0.6mm shim. The last 3.88 G type gearbox I opened up had a 0.6mm shim, just like he said.

In this topic, I'd like to hear from those that have made observations on what shim thickness is usually with what R&P with a LATE pinion bearing. (We can do the early bearing later)

G 4.37
K 4.37
O 4.37

G 4.12
K 4.12
O 4.12 0.55mm

G 3.88 0.6mm
K 3.88

Posted: Sat Nov 04, 2006 10:42 am
by Hotbugsy
I have run .035 shim in my Rhino cased gear box for Years . I run the car with my turbo set up and have never had a failure... When the ring gear gets noisy, I swap it out for another and re-use the same shim . I know a few people out there that once they find the shim that is most happy in there , thats what they stay with . My spare box will also has the same shim . This don't mean I'm correct, but when you find somthing that works , why change it ?

Posted: Sat Nov 04, 2006 3:38 pm
by Bruce2
Looking for info on Late pinion bearings, not early.

Posted: Sat Nov 04, 2006 7:31 pm
by Hotbugsy
Oops .... I have one car that has a late styly bearing in it . It is a turbo setup also , but I don't abuse it enough to need Trans work .... at least no yet .

Re: Ring & Pinion shims

Posted: Mon Nov 06, 2006 5:30 pm
by Bruce2
Update from Mike at Rancho.
Bruce2 wrote: G 4.37
K 4.37
O 4.37

G 4.12 0.6mm - 0.625mm
K 4.12
O 4.12 0.55mm

G 3.88 0.6mm
K 3.88

Posted: Thu Nov 30, 2006 1:45 pm
by Hotbugsy
My spare Trans had to come apart due to breaking the case in half all the way around ! I used a .018 Shim on my late style big nut set up . Wear pattern looked great ! No broken Teeth from the explosion either ! If I ever use the late style big nut setup again, I will use the same set up with that size shim .

Posted: Fri Dec 08, 2006 7:59 pm
by Bruce2
Hotbugsy wrote: I used a .018 Shim on my late style big nut set up ..
Good info, what was the R&P ratio and type?

Here's an update:
Bruce2 wrote: G 4.37
K 4.37
O 4.37

G 4.12 0.6mm - 0.625mm (from Mike @ Rancho), mine was 0.55mm
K 4.12
O 4.12 0.55mm

G 3.88 0.6mm
K 3.88

Posted: Fri Dec 08, 2006 8:19 pm
by Hotbugsy
G.. 3.88 R/P up aginst 2387cc turbo. Black majic disc . The track was glued to hold 6sec street door slammers . 1st explosion I have gone thru with out a tooth gone on the pinnion.

Posted: Sun Jul 01, 2007 5:47 am
by dangerous
The most recent boxes I have seen had G4.125 .7mm shim.
G3.875 and G4.375 were both .6mm

Posted: Sun Jul 01, 2007 2:41 pm
by Bruce2
The new list:
K 4.62 .50mm

G 4.37 .6mm
K 4.37
O 4.37

G 4.12 .6mm - .625mm (from Mike @ Rancho), .55, .70, .55, .60, .60
K 4.12
O 4.12 .55mm

G 3.88 .6mm, .6mm
K 3.88
O 3.88
I added a few more.

Posted: Wed Dec 26, 2007 1:33 pm
by Dougy Dee
A recently purchased G 3.88 setup needed a .50mm shim to measure to the deviation number indicated on the ring gear. This went in to a new Rhino case with 4 bolt retainer..

Posted: Wed Dec 26, 2007 3:22 pm
by Bruce2
Thanks for the input DD. However, I intended this topic as a collection of shims for late pinion bearings, not early. The same R&P will use a different thickness of shim with each bearing.
K 4.62 .50mm

G 4.37 .6mm
K 4.37
O 4.37

G 4.12 .6mm - .625mm (from Mike @ Rancho), .55, .70, .55, .60, .60
K 4.12
O 4.12 .55mm

G 3.88 .6mm, .6mm, .65mm, .65mm
K 3.88
O 3.88

Posted: Wed Dec 26, 2007 6:17 pm
by Dougy Dee
Yeah, I saw the late pinion bearing reference as I hit the 'submit' button...

Just pulled a G 4.125 down with .64mm chims (.50 + .14) in SSC case.

Posted: Tue Jan 01, 2008 4:57 pm
by Lo cash lester
Just pulled a K-3.88 apart and found .1mm shim. This was, as far as I can tell, a factory build. Had been setting for a very long time and everything looked premo inside. Ended up using the same shim in another case for a swing axle car. Lester
K 4.62 .50mm

G 4.37 .6mm
K 4.37
O 4.37

G 4.12 .6mm - .625mm (from Mike @ Rancho), .55, .70, .55, .60, .60
K 4.12
O 4.12 .55mm

G 3.88 .6mm, .6mm, .65mm, .65mm
K 3.88 .1mm
O 3.88

Posted: Tue Jan 01, 2008 11:48 pm
by Bruce2
Bentley lists .15mm as the smallest shim. Are you sure about the one you found? Could there have been a conversion error?