VW Gearbox Ratios

This information in the following table comes from:

Gearbox CodeModel1st2nd3rd4thR&PTotal in 4thNotes
AA12003.782.061.260.934.375 4.069 
AB13003.782.061.260.934.375 4.069 
AC15003.782.061.260.894.125 3.671 
AD12003.782.061.260.934.375 4.069LSD
AE 1300 3.78 2.06 1.26 0.93 4.375  4.069 LSD
AF 1500 3.78 2.06 1.26 0.89 4.125  3.671 LSD
AG 1200 3.78 2.06 1.26 0.93 4.375  4.069 Type 147 (Fridolin)
AH 1500/1600 3.78 2.06 1.26 0.89 4.125  3.671 "IRS"
AK 1500/1600         3.875   Type 181 (Trekker)
AL 1500/1600         3.875   Type 181 LSD
AM 1300 3.78 2.06 1.26 0.93 4.375  4.069 Saloon & Cabrio
AN 1600 3.78 2.06 1.26 0.93 3.875  3.604 Karmann Ghia "IRS"
AO 1600 3.78 2.06 1.26 0.93 3.875  3.604 Karmann Ghia
AP 1300 3.78 2.06 1.26 0.93 4.375  4.069 LSD
AQ 1600 3.78 2.06 1.26 0.89 4.125  3.671 LSD
AR 1600 3.78 2.06 1.26 0.93 3.875  3.604 Karmann Ghia LSD
AS16003.782.061.260.933.875 3.604 
AT 1600 3.78 2.06 1.26 0.93 3.875  3.604 1303S
AU 1600 3.78 2.06 1.26 0.93 3.875  3.604 1303S LSD
AX   3.78 2.06 1.26 0.93      
BA 1300/1500         4.375   Semi-Auto
BC 1300/1500         4.375   Semi-Auto LSD
BE 1600         4.125   Semi-Auto
BF 1600         4.125   Semi-Auto LSD
BG 1300         4.125   Karmann Ghia Semi-Auto
BH 1300         4.125   Karmann Ghia Semi-Auto LSD
BJ 1300         4.375   Semi-Auto
BK 1300         4.375   Semi-Auto LSD
DA 1500/1600 3.78 2.06 1.26 0.89 4.125  3.671 Type III
DB 1500/1600 3.78 2.06 1.26 0.89 4.125  3.671 Type III LSD
DC 1500/1600 3.78 2.06 1.26 0.89 4.125  3.671 Type III "IRS"
DD1500/1600    4.125 3.671Type III "IRS" LSD
In South Africa we have:
SFAB13003.782.061.260.934.375 4.069Same as AB
SFAD1500?3.782.061.260.89?4.125 3.671Same as AC?
SFAS16003.782.061.260.933.875 3.604Same as AS

Building a "freeway flyer" gearbox

As you can imagine, a 1700 VW engine has more than enough torque to keep a light little car like a Puma going. And as such, the top speed is only limited by the engine revs, and keeping the engine revs down is good for the engine. So, a higher top gear would be nice.

Gearbox Code1st2nd3rd4thR&PTotal in 4thSpeed at 4000 rpm in fourth 185x70/14 (Calculator)
AB, SFAB3.782.061.260.934.3754.069 113 km/h
AC, SFAD3.782.061.260.894.1253.671 126 km/h
AS, SFAS3.782.061.260.933.8753.604 128 km/h
If you want to increase the top speed for the given engine revs, you need to lower the total ratio even more. Depending on where you start, you can change the 4th gearset or the R&P.
SFAD with 3.875 R&P3.782.061.260.893.8753.449 134 km/h
SFAS with 0.89 4th gear3.782.061.260.893.8753.449 134 km/h
You can do even better by buying a 0.82 4th gear set (originally from the early swingaxle + reduction box bus)
SFAD with 0.82 4th gear3.782.061.260.824.1253.382 136 km/h
SFAS with 0.82 4th gear3.782.061.260.823.8753.178 145 km/h

It seems that the last option is maybe overkill.

(Type 1 transmission modifications when using a Type 4 engine)

"Use a super-dif, H.D. side cover and have the engagement teeth welded on third and fourth gear. On the '71-up trans case, use an asymetrical bearinged Vanagon pinion bearing.(Same I.D./O.D. as T-1 unit) Transmission straps are out. Use a rear engine hanger with the stock rubber mounts - unless you're racing. This results in five insulated drive train mounts.

Best ratios found for Type 4 in Type 1 is a 4.125 R&P with a .821 4th gear with a final drive ratio of 3.38:1. In a Type 4 in a Type 2 (early) is a 3.875 and a .89 4th with a final ratio of 3.44."

-- Joe Locicero of Oregon Performance Products.

The Freeway Flyer Transmission: Is The Taller Gear Ratio Right For Your Ride?

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(This page last modified 2003-09-24)