which Trans on the GTM?

[mendo]

I want to know more about the Porche trans, I heard some things about different gear ratios, different years.

is there a "best one"?

how about a list in order of Best to not-as-good.

OK, now, I toss in..... about what will it run!!!!

any info is appreciated!!

I am gathering parts for the build. got the kit, looking for donar Car and trans.

[Brian Z]

Here is some information we have on different transaxles. We have not tried them all, or driven them all, so we could not give an honest opinion about which one works best in the car.

NOTE: The information contained in this document has not been verified. It is a collection of information from a number of sources that are not all reliable. It serves as a starting point towards choosing a transaxle for a GTM. For any information that may be beneficial to add or correct in regards to this document, please email [email protected]


G50-00 - These work with FFR GTM. (specify with FFR either ’89-older or ’90-newer)
-01 - They came in 1987-1992 Porsche 911s except 4wd versions
-02 - Some have short cases, and some have long cases, both of which will work
-03 - All have a 7.6” ring gear
-04 - All 5-speeds
-05 - G50-02s may have shorter gear ratios. They came in Porsches built for
Switzerland.

G50-20 - Works with FFR GTM.
- Came in 1993-1996 Porsche 911s except 4wd versions
- All have long cases
- All have a 7.6” ring gear
- All 6-speeds

G50-52 - These work with FFR GTM (costs around $5000-$7000 used)
-53 - The G50-52 came in 1990-1992 Porsche 911 Turbos
- The G50-53 came in 1995-1998 Porsche GT2s (approx. 450 ft-lb engine)
- All have long cases
- All have a 9” ring gear
- All 5-speeds, except the G50-53 is a 6-speed

Mendeola-SDR - Works with FFR GTM. (costs over $15,000)
- Mounts just like a long case G50
- Came from the aftermarket only
- 5-speeds

TRANSAXLES BELOW ARE NOT DIRECT BOLT-INS TO THE FFR GTM, THEY ARE, HOWEVER, COMMONLY ASKED ABOUT.

G15 - FFR GTM does not have a mount to install this transmission, but there is
enough space, and axles would line up.
- Came in 1988-older Porsche 911 Turbos (930)
- All 4-speeds

G50-31 -Same as G50-20’s, except gears are too low
-32 -Came in Porsche 993RS and 993RS/CS

G50-50 - The G50-50 came in 1989 Porsche 911 Turbos
- All have long cases
- All have a 9” ring gear
-Very strong, can work with GTM, though would require a flywheel from
Kennedy Engineering, and a way to connect the shift linkage.

G64-__ -Came in 1993-1998 Carrera 4’s
-All wheel drive
-Not limited slip
-5 and 6 speed versions

G96-50 -FFR GTM does not have a mount to install this transaxle, or cable shifter.
-However, there is enough space, and axles would line up. This is an AWD(all-
wheel –drive)transaxle, though it could work by either letting the rear output
spin freely, or cutting it off. These transaxles are not limited slip.
-Came in ’01-’05 Porsche 996 AWD turbo versions.
-All cable shifter


G96-90 - FFR GTM does not have a mount to install this transaxle, or cable
shifter. However, there is enough space, and axles would line up. They do not have a starter pocket
- Came in most 1999-2004 Porsche 911 except 4wd versions
- The GT2s were in 3200lb cars with 490hp and 473ft-lbs
- All cable shifter
- 6-speeds

G96-96 - FFR GTM does not have a mount to install this transmission, or cable
shifter. However, there is enough space, and axles would line up.
- Came in 1999-2004 Porsche GT2, and GT3’s except 4wd versions
- All cable shifter (use McMaster Carr #1407K68, Qty. 2)
- All 6-speeds (GT2s were in 3200lb cars with 490hp and 473ft-lbs)

A016 - FFR GTM does not have a mount to install this transmission, but there is
enough space, and axles line up. There is no starter pocket.
- Came in Audi A4s and 5000s
- Fairly light duty
- All 5-speeds

RBT or ZF - FFR GTM does not have a mount to install this transmission, but there is
enough space, and axles line up. (Costs around $10,000)
- Came from the aftermarket only
- Used to be called a ZF transaxle until RBT took over production.
- Came in the early 70s Pantera
- Some 5-speeds, some 6-speeds

Ricardo - FFR GTM does not have a mount to install this transmission, but is most
likely too large, and axles line up. (Costs over $15,000)
- Came in 2005+ Ford GT
- All 6-speeds

Hewland - FFR GTM does not have a mount to install this transmission, but there is
enough space, and the axles line up. (Costs over $15,000)
- Came from the aftermarket only
- They sell street and race versions
- All 6-speeds

Quaife - FFR GTM does not have a mount to install this transmission, but there is
enough space, and axles line up. (Costs over $15,000)
- Came from the aftermarket only
- They sell street and race versions
- All 6-speeds

Renault R25 - FFR GTM does not have a mount to install this transmission, and it is
most likely too tall.
- Came in Lotus Espirit, European GT-40 replicas, and 1987-1989 Eagle
Medallions.
- Possibly handles up to 400hp

Subaru STI - FFR GTM does not have a mount to install this transmission, but there is
enough space.
- Has output shaft for 4wd
- Data is limited on power capacity
- Came in 2004-newer Subaru STIs
- 6-speed

CIMA - FFR GTM does not have a mount to install this transmission, but there is
enough space.
- Came in the Koenigsegg CCR, and the Pagani Zonda
- All 6-speed

[Brian Z]

Horse power also plays a huge role in selecting which trasaxle to use. A stock G-50 Porsche transaxle could only hold 350-400hp in a street car. That amount of power would be too much in a dedicated race GTM with the standard G-50. There are stronger units, but the price gets "stronger" with the strength of the transaxle.

Best regards,