[T3] question one 003 auto trans diff section
catnine09 at dslextreme.com
Tue Mar 29 13:15:06 PDT 2016
I have the one in my 73 T-3 and a spare from a 72 T-3 both have atuo trans cases and diffs and auto trans.
I was thinking of re sealing the spare 72 diff section I have .
I looed on the right side or the 72 diff at the very bottom on the right side just ahead of the diff fill plug . Both diff housings have the same VW # 003 507 111A same spot but on the left side as they would set in the car. The 72 Diff section on the right side begins with 2 letters followed by numbers the 72 is an EK , the 73 in the car is an EJ.
I was trying to determine the diff final drive gear ratio. T-3 should be 3.67 .
I found this chart
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 driveratio.
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.
It states the T-3 3.67 is EB can't find EJ . It states EK as 3.72.
Is there any info on the EJ ? Also without removing the 72 EK gear set out of the case how can I determine the ratio since I don't know if I can trust the case markings . And how would I determine what ratio the EJ is since the diff is in the car so I cant see the pinion end ?
The EJ has always been in this car since I bought it and it seems to be the proper ratio based on speed and in 3rd gear and tach readings.
Any help would be great.
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