 The
first one is called an R25 or UN1 transmission and they were originally
put into the 1987-1989 series Eagle Medallions (AMC/Chrysler/Jeep)!
Although a little smaller than the ZF they can take up to 400 hp. The
Brits and Aussies have been using them for years both for street and
racing.The other transmission that you might consider is the Hewland racing
transmission. They go for about $2000 and as far as I can tell they do
every the ZF does but at a fraction of the cost.
And, last but not least,
there is also a transmission from a lesser known Audi that is also a
match but I still have to get some more info on it. However, my feeling
on this one is that it won't be as available as the R25 in North
America.
Renault transaxle Data
Renault five
speed manual transaxle gear and differential ratios
|
Model |
Part No. |
1st |
2nd |
3rd |
4th |
5th |
Rev |
Diff |
|
20 |
369.00 |
3.36 |
2.06 |
1.38 |
1.06 |
0.82 |
3.55 |
4.11 |
|
|
369.05 |
3.36 |
2.06 |
1.38 |
1.06 |
0.82 |
3.55 |
4.11 |
|
20TX |
369 |
3.36 |
2.06 |
1.38 |
1.06 |
0.87 |
3.55 |
3.778 |
|
20LS/TS |
369 |
3.82 |
2.18 |
1.41 |
1.03 |
0.86 |
3.55 |
3.778 |
|
21Turbo |
UN1-013 |
3.36 |
2.05 |
1.38 |
1.03 |
0.82 |
3.54 |
3.44 |
|
25GTX |
UN 1-03 |
3.36 |
2.05 |
1.38 |
1.04 |
0.82 |
3.55 |
3.89 |
|
25V6 |
UN 1-04 |
3.36 |
2.05 |
1.38 |
0.96 |
0.76 |
3.55 |
3.89 |
|
Alpine GTA |
UN1-05 |
3.36 |
2.05 |
1.38 |
1.04 |
0.82 |
3.55 |
3.44 |
|
25 Blindee |
UN 1-06 |
3.36 |
2.05 |
1.38 |
0.96 |
0.76 |
3.55 |
4.11 |
|
Alpine Turbo |
UN1-07 |
3.36 |
2.05 |
1.38 |
0.96 |
0.76 |
3.55 |
3.44 |
|
25V6 Turbo |
UN1-08 |
3.36 |
2.05 |
1.38 |
0.96 |
0.76 |
3.55 |
3.778 |
|
30TX |
369-01/06/017 |
3.36 |
2.05 |
1.38 |
1.06 |
0.82 |
3.55 |
3.89 |
|
30TS |
369-01/06/014 |
3.36 |
2.05 |
1.38 |
1.06 |
0.82 |
3.55 |
3.89 |
The type UN1-013 Renault 21 Turbo is the preferred
transaxle for use in the GT40 replicas although the 25 Turbo and GTA
boxes are also often used. Also note that if the GTA box is used it
either has to be inverted or the differential reversed unless five
reverse gears are required. On all boxes the selector shaft has to be
modified to extend out of the right hand side of the gearbox so as to
link up with the right hand gear change linkage. The preferred CV joints
are from the Ford Granada and adaptors have to be fitted to the Renault
transaxle output shafts to couple to these. These adaptors are
commercially available items.
The transaxle type can be found on a small aluminum
disk around 1-1/4" diameter which is held onto the box by one of the
fixing bolts on the rear end cover of the gearbox. Unfortunately if this
cover has ever been removed the disk is rarely replaced and the only way
to identify the box is by checking the gear ratios.
Audi transaxle Data
Audi
100/200/9000 five speed manual transaxle gear and differential ratios
|
Type |
1st |
2nd |
3rd |
4th |
5th |
Rev |
Diff |
Speedo drive |
|
013 Serial Number prefix 3T |
3.46 |
1.79 |
1.07 |
0.78 |
0.60 |
3.17 |
4.11 |
0.52 |
|
013 Serial Number prefix HE |
3.46 |
1.79 |
1.13 |
0.83 |
0.68 |
3.17 |
4.11 |
0.52 |
|
013 Serial Number prefix HF |
3.46 |
1.79 |
1.13 |
0.83 |
0.68 |
3.17 |
4.11 |
0.52 |
|
093 Serial Number prefix 3Q |
2.84 |
1.52 |
0.90 |
0.64 |
0.48 |
3.16 |
5.22 |
0.52 |
|
016 Serial Number prefix AAZ |
3.60 |
2.13 |
1.46 |
1.07 |
0.86 |
3.50 |
3.89 |
0.52 |
|
016 Serial Number prefix 3V |
3.60 |
2.13 |
1.46 |
1.07 |
0.83 |
3.50 |
3.89 |
0.52 |
|
016 Serial Number prefix 3K |
3.60 |
2.13 |
1.36 |
0.97 |
0.78 |
3.50 |
3.89 |
0.52 |
|
016 Serial Number prefix 5N |
3.60 |
2.13 |
1.36 |
0.97 |
0.73 |
3.50 |
4.11 |
0.52 |
|
016 Serial Number prefix 3U |
3.60 |
1.88 |
1.19 |
0.84 |
0.64 |
3.50 |
3.89 |
0.52 |
|
016 Serial Number prefix BMO |
3.60 |
1.94 |
1.23 |
0.903 |
0.684 |
3.50 |
3.89 |
0.52 |
Audi
100/200/9000 four speed manual transaxle gear and differential ratios
|
Type |
1st |
2nd |
3rd |
4th |
Rev |
Diff |
Speedo drive |
|
014 Serial Number prefix QN |
3.46 |
1.79 |
1.07 |
0.70 |
3.17 |
4.11 |
0.52 |
|
014 Serial Number prefix 4X |
3.46 |
1.79 |
1.07 |
0.70 |
3.17 |
4.11 |
0.52 |
The Audi suffix 016 transaxle is the preferred
transaxle for use in the GT40 replicas. The 016 boxes have the selector
shaft on the left hand side, all other boxes have the shaft in line out
of the back of the box. The 016 selector shaft has to be modified to
extend out of the right hand side of the gearbox so as to link up with
the right hand gear change linkage. The CV joints used on most (UK) GT40
replicas are from the Ford Granada and the output shafts on the Audi
type 013 transaxle have mountings to suit. The Audi type 016 has output
flanges to suit similar but slightly larger diameter CV joints which
could be adapted for use with the smaller CV's if necessary or better
still to use as standard with larger diameter drive shafts. Note that
Audi 200 were later versions of this car and the 9000 range were again
the same but the American version of the car.
The standard Ford V6 flywheel commonly used on GT40
replicas will not fit into the bell housing on this transaxle. A special
flywheel or extra thick adaptor plate will have to be used. The standard
Audi flywheel would have too many fixing holes making the mounting
unsafe if modified for use with the Ford V8. |
