[T3] question one 003 auto trans diff section

[William J]

 I think the 72 spare I have from using math and what I can find the AK 
prefix is a T-4 like the ring and pinion you have works out to a 3.73 ratio 
so it's geared a bit lower than the 3.67  that should be stock T-3 . I can't 
seem to locate any info on the EJ version I have always had in my car so I 
don't know if the one in my car is the 3.67 stock ratio. It seems right or 
at least close based on speed and a tach . Course the speedo due to age is 
probably off a bit. It seems close based on the electronic speed readers 
they have proped up along some road sides here. It's closer at 40 MPH than 
35 .

 There really isn't a way to check the diff ratio in my car since you can't 
see the pinion rotate like a drive shaft and 3 rd gear is 1.1 yet I don't 
think I would care to try to put it on jack stands get it in 3rd and try to 
count wheel turns .
----- Original Message ----- 
From: "Jim Adney" <jadney at VWType3.org>
To: <type3 at vwtype3.org>
Sent: Wednesday, March 30, 2016 11:21 AM
Subject: Re: [T3] question one 003 auto trans diff section


> William,
>
> I don't have much experience with these. That said, here's what I
> think I can say about ATs and final drives.
>
> Yes, the 2-letter prefix defines the part, so all EBs, etc, should be
> alike inside and out. Every change got a different prefix. I don't
> know final drive ratios, so if they're not in the Bentley or in
> Service Without Guesswork, I'm no help. If you find various sources
> that disagree, I'd go with the one that seems closest to official VW.
>
> Unfortunately, the parts lists don't break things down by the alpha
> prefix, but I note that it only lists 1 ring/pinion replacement part
> at 9:33. That part # has no letter suffix, so it's either the only
> ratio supplied with Type 3s, or it was the first one supplied and the
> only one supplied as a replacement part.
>
> I have one final drive downstairs, so I unpacked it to count teeth.
> It's 11:43 and is stamped G1143, which I take to stand for Gleason
> 11:43. Unfortunately, I don't know the history of this final drive,
> so I don't know what it came out of. Someone just gave it to me, but
> my info seems to indicate that it must have come out of a Type 4.
>
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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