I don't think a Corvette transmission would work, unless doing a longitudinal swap. The transmission has to come from a FWD car, or another mid engine RWD doesn't it?
The Vette C5/C6 transmission is designed to work in the C5/C6 Vette and wouldn't really fit well in a Fiero, unless you put the engine in the front and used the torque tube.
A Porsche trans would work better. Or just use the F40-MT2 transverse 6 speed out of the Pontiac G6, which most are using with LSx swaps.
I don't think a Corvette transmission would work, unless doing a longitudinal swap. The transmission has to come from a FWD car, or another mid engine RWD doesn't it?
Even logitudinally in the rear, the Vette trans wouldn't work so well, due to the way the clutch/torque tube/shifter all work together. You'd really need to do a bit of a stretch with some very convoluted shifting mechanism, or just put the motor up front to use it.
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09:57 PM
Oct 5th, 2011
qwikgta Member
Posts: 4671 From: Virginia Beach, VA Registered: Jan 2001
Always wondered if you could ditch the torque tube, and attach the trans to the motor some how. Then put it in a streatched Fiero.
Rob
Maybe with the auto trans you could with an adapter plate. The manual trans would need a custom torque tube setup though. There's a reason all the GTM kits use the Porsche trans.
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09:37 AM
Rick Morehouse Member
Posts: 311 From: Conway,S.C.,USA Registered: Jan 2008
W/respect to all posts-anything can be done. Haven't seen the vette set up, but no doubt the 6 spd can be adapted to the bellhousing on the motor. I'm old school, doing a 62 Pontiac 4 spd T/A w/215(now an 87 land rover V-8) mated to the bellhousing w/ an adapter plate I fabbed. No pics yet-putting a 3 piece flywheel together. The shift input shaft exists the T/A nearly center the bellhousing about 2" up from bottom edge. A sliding/twisting tube shift lever will work w/3/4" automotive U-joints-steering type. ANYTHING can be done. Rick
W/respect to all posts-anything can be done. Haven't seen the vette set up, but no doubt the 6 spd can be adapted to the bellhousing on the motor. I'm old school, doing a 62 Pontiac 4 spd T/A w/215(now an 87 land rover V-8) mated to the bellhousing w/ an adapter plate I fabbed. No pics yet-putting a 3 piece flywheel together. The shift input shaft exists the T/A nearly center the bellhousing about 2" up from bottom edge. A sliding/twisting tube shift lever will work w/3/4" automotive U-joints-steering type. ANYTHING can be done. Rick
We did not say it could not be done. We said use of the ZF 6-speed from the C5/C6 Vette would require significantly extra work. We stated what work was necessary to do it. If you wish to do it, have fun.
W/respect to all posts-anything can be done. Haven't seen the vette set up, but no doubt the 6 spd can be adapted to the bellhousing on the motor. I'm old school, doing a 62 Pontiac 4 spd T/A w/215(now an 87 land rover V-8) mated to the bellhousing w/ an adapter plate I fabbed. No pics yet-putting a 3 piece flywheel together. The shift input shaft exists the T/A nearly center the bellhousing about 2" up from bottom edge. A sliding/twisting tube shift lever will work w/3/4" automotive U-joints-steering type. ANYTHING can be done. Rick
Umm... with all respect, you do know what the Corvette six speed transmission setup is correct? The transmission is essentially the "rear end" - that is, the engine is up front, then there is the "torque tube" that qwikgta elluded to which is not really a drive shaft but kind of is, and then you have the actual transmission at the rear end.
The transmission itself is very long in shape. Coupled with the engine itself I don't see any viable way it could work on a stock chassis Fiero, even with ditching the "torque tube" somehow. Now on a stretch, like with a replica, it may be possible, but then again we are talking about modifying an important piece that dictates how the transmission works.
Now the Factory Five GTM supercar uses late model Corvette running gear as a donor. That may be something to explore to see what trans the car uses (I don't recall off the top of my head).
------------------ 1986 Fiero GT... with REALLY high mileage
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12:15 PM
Oct 7th, 2011
PerKr Member
Posts: 641 From: Mariestad, Sweden Registered: Nov 2006
while we're at it, let's try to be specific as to what porsche transmissions to look at. I wouldn't expect a 928 transmission to be a better option than the vette transmission
If you have a C5 or C6 drivetrain, I would suggest looking into putting it in something other than a fiero, like maybe a cobra or an older vette.
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05:45 PM
Oct 8th, 2011
madcurl Member
Posts: 21401 From: In a Van down by the Kern River Registered: Jul 2003
No way it would work the corvette is a longetutal transmission you would need a transverse FWD transmission for a fiero unless you did a front engine conversion.
No way it would work the corvette is a longetutal transmission you would need a transverse FWD transmission for a fiero unless you did a front engine conversion.
Tell that to everyone using the TH325/425 or Porsche transmissions.
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10:33 PM
Oct 9th, 2011
Australian Member
Posts: 4701 From: Sydney Australia Registered: Sep 2004
Here are some pics so you can see the relative placement of the differential vs. the transmission body. The differential placement will determine the needed length of stretch for your particular engine combo.
C5/C6 Corvette - notice the differential is at the rear of the transmission, not at the front or in the middle - this will take a huge frame stretch to use if you place the engine in the rear:
Porsche G50 (and most porsche rear engine transmissions) - notice the differential is biased to the front/bellhousing area allowing a much shorter stretch vs. the C5/C6:
Delorean transmission - similar to the Porsche setup:
Pantera transmission - again similar to the Porsche setup:
Porsche 928 transmission - this was one of Porsches front engine V8/ RWD setup (similar to the C5/C6, but with the differential biased to the front vs. rear):
Dodge/Chrysler FWD Intrepid Longitudinal transmission - notice the differential is behind the engine bellhousing, but inside the transmission bellhousing, making it the shortest of setup with the differential behind the engine.
THM 425 - notice this transmission places the differential forward of the bellhousing or approximately in the center of the engine - this is one of the shortest longitudinal setups:
[This message has been edited by fieroguru (edited 10-09-2011).]
to be even more specific... a g50 03, g50 05, g50 52 would be preferable. the g50 01, g50 02, and g50 50 will work but you will have to check flywheel/pressure plate/clutch stack height closely.
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06:46 PM
PFF
System Bot
Dec 6th, 2011
qwikgta Member
Posts: 4671 From: Virginia Beach, VA Registered: Jan 2001
Still one of my favorite kit cars. I have seen one in person, and they are awesome. I'd love to do one someday.
I have thought about stretching a Fiero 10 - 12 inch's and putting a LS3/GTM trans in it. Then chop the top, fill the gap with other Fiero panels and make a sweet strechted Fiero. Just need the $50K to get er' done.
Factory Five also sells its own GTM trans. http://www.factoryfive.com/...ans/mendeolatxt.html Expensive, but no adapter plate needed for trans/engine. Just shipped the first Trans in Nov. We'll see how they hold up. For $8000 it better be worth it.
quikgta actually 8000.00 is fair for a mendeola. if you price the g50 porsche gearboxes they are 3500.00 used with no guarantees, meaning rebuild it or else. and 5500.00 for a stock rebuilt which isnt optimal for v8 gearing wise. and 9000. to 12000.00 for rebuilt boxes with v8 type gearing. if you want monster torque gearbox you go with the g50 52 twin turbo box rebuilt with lsd and billet side cover and shifter for midship use and your in the $20,000.00 to $25,000.00 territory. just saying...
