[T3] Type 3 VS Type 4 Final Drive
Jim Adney
jadney at vwtype3.org
Tue Dec 31 15:05:37 PST 2013
On 31 Dec 2013 at 16:28, Bobsnotch at aol.com wrote:
> Well, checking some of the info I got from Russ, says that there were 2
> different sets of AT final drive gear ratios. A 411 (sedan) got the same
> 3.67:1 that the type 3 got. The 461 (wagon) got the 3.91:1 final drive ratio.
> The 411 is marked ED, while the 461 is marked EC (how you tell the difference
> between the 2).
Okay, here's what I find in my latest "Without Guesswork."
Type 3: 9:33 (3.67) transmission marked EB
Type 4 (both bodies): 11:43 (3.91) up thru July '73 marked EG or EH
Type 4 1700 sedan: 11:41 (3.72) from Aug '73
Type 4 1700 wagon: 11:43 (3.91) from Aug '73
Type 4 1800 both bodies: 11:43 (3.91) from Nov '73
or, viewed a different way:
EB: 9:33 (3.67) used on Type 3s
My book doesn't mention the ED, but I'll bet that's the later Type 3
version introduced in Aug '71.
EG: 11:43 (3.91) used on Type 4 1700s up to July '71
EH: 11:43 (3.91) used on Type 4 1700s Jul '71-on
EK: 11:41 (3.72) used on Type 4 1700 sedans from Jan '73
EM: 11:43 (3.91) used on Type 4 1800s
I believe the E? is a prefix to a serial number that's stamped
somewhere on the lower side of the case, so it will somewhat hard to
find. I don't remember where to tell you to look for it.
The book implies that all of these gearsets were made by Gleason.
I agree that changing the output drive flanges is probably the way to
go. That should be a direct swap, but don't forget to install the
seal covers over the top of the Allen bolts that hold those flanges
in place. If those are not sealed, gear oil will come out there and
wash the grease out of the CV joints, making a mess and leaving the
final drive low on gear oil.
Swapping gearsets is a much bigger deal. It sounds interesting, but
may require special tools and a lot of care to get a quiet and long
running adjustment. Still, you should study the process carefully and
consider it.
Happy New Year, Everyone!!!
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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