[T3] Type 3 VS Type 4 Final Drive

[Bobsnotch at aol.com]

In a message dated 12/31/2013 6:05:49 P.M. Eastern Standard Time,  
jadney at vwtype3.org writes:
 
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!!!
 
 
Happy New Year to everyone!!
 
Jim, I got the info off the disc Russ made for me. You should have a copy  
of it from Marilyn, that she gave you at the 2012 Invasion (it's in PDF  
form).
In the Automatic Transmission section, is where I found the info (section  
H 4.2 AT page 1-14), supplement 10. It's a nice chart. : )
In it, it calls out the trans number is stamped right on the flat ledge  
above the fill plug for the diff (page 1-13). 
Also called out are engine codes for the t-3 trans under the "U"  
designation, and the EB prefix for the 003 300 035 A, and EJ prefix with  an H 
suffix, but they also call out an "E" suffix for California only,  from Aug 71 on 
(with "X" as the engine designation, and an EJ prefix). Note,  this is also 
the same year that VW changed the vacuum modulator unit. But what  surprised 
me, was the govenor unit had the same part number for all but the  bus 
trans (part number 003 325 041).
The T-4 also got it's own "California only" trans with the designation of  
003 300 035 F (EG was standard, but EH was Cal only) from 71 on. 
 
All of that said, I believe the early ED t-4 transmissions were used in  
Europe with carb engines from 68 to 70, and when VW started offering the Fuel  
Injection on them, along with importing the Type 4 (411/412) to the USA, 
they  changed the final drive gearing to 3.91:1 (8-70). It used engine code  
"W".
 
The EB type 3 trans was up thru 8-71 (003 300 035 A), then was replaced  
with the EJ trans in 8-71 (003 300 035 H). 
 
I hope this helps, and maybe fills in a couple of gaps.  

Bob 65  Notch S w/Sunroof and IRS aka Krusty
64 T-34 Ghia aka Wolfie
71  Square-vert under  construction


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