Which transmission should I go with? [Archive] - GrandAmGT.com Forum

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silvergtjrad
06-29-2008, 10:36 AM
Im in the process of buying two transmissions right now, but havent completely followed through on either. Just looking for some serious opinions here. Before anyone suggests it (not saying names) I will not even consider building a 4t45, end of story.

My two goals for the transmission upgrade are long term reliability behind a powerful motor (300+WHP), and second to that would be improving 1/4 mile times as a result of gearing etc. This is with drag racing in mind only.

Option 1: Getrag F40 6 speed swap. This is the swap that tim did.
The cost of all of the parts is somewhere in the neighborhood of $1500-$2000 plus any other fabrication materials needed for mounts
Pros: Better gearing, has been swapped into a lot of v8 fieros and can hold power, lighter than stock trans, less drivetrain power loss, fun to drive
Cons: Some hard to find parts, custom fab. of mounts, and Ive only driven stick a couple of times.

Option 2: Intense Built 4t65HD with 3.69 gears, 7/8ths chain, 3000RPM stall, shift kit, upgraded clutches, hardened input shaft, and a new valve body. The transmission is $1900 (I can probably get him to knock $100 or so off)
Pros: Better gearing, proven to handle some big power numbers, aftermarket support from numerous vendors, I couldnt touch the same build on a 4t45 or 4t65 for the price
Cons: Custom mounts, need to adapt wiring, slightly heavier than a 4t45, not sure what axles will work.

Rich
06-29-2008, 05:15 PM
i vote for 6 speed. driving stick isnt too hard. i guess it depends on how much power you plan on having and if the 6 speed would need to be upgraded.

lvemy3100
06-29-2008, 05:25 PM
1

silvergtjrad
06-29-2008, 05:28 PM
thanks for the input guys, the 6 speed seems to be the general concensus

bigstribs
06-29-2008, 05:30 PM
4t65HD built

Just 1 bit of advice from experience,

Do Not get the LSD from Intense!!!

silvergtjrad
06-30-2008, 07:19 PM
I bought the 4t65 guys. Going to pick it up tomorrow.

4t65HD built

Just 1 bit of advice from experience,

Do Not get the LSD from Intense!!!

Werd. Ive heard too many horror stories. ZZP uses the stock HD diff in their drag cars.......

Rich
06-30-2008, 07:32 PM
congrats on picking it up. hope the install works out for you.

silvergtjrad
06-30-2008, 07:59 PM
congrats on picking it up. hope the install works out for you.

Thanks. After consulting a few people, and doing some thinking, I think the automatic wasthe better choice. It should go in with minimal difficulty

bigstribs
06-30-2008, 08:09 PM
excellent choice man :)

im yet to see zzp's tt gp run :( they broke the drive shaft at MGM :(

XtremeGaGt00
06-30-2008, 08:10 PM
when you do this install writeup if you do one..make sure you take alotta pics and jot down alotta notes..im in a debate also with what trans i want to go with...i dont need to d.d the g.a anymore so i can start thinking about this kinda stuff...lol

03GtinWI
03-29-2012, 05:20 AM
Yea the 6 speed in our car.would be pretty damn fun to drive but it would take a lot of custom work and time and money with that project. Good choice on the 4t65.

mfuller
03-29-2012, 06:12 AM
Thread is 4 years old and OP no longer has his car.
But there are a few other 6-speed swaps around.

sleepyalero
03-29-2012, 06:42 AM
like me ;)

Matt, i like how we both have Black GLS sedans haha. and you have a razzi kit, honestly.. everything done to your car is where i plan on going with mine. its weird ive already had all the stuff you have, planned out for mine (brakes, seats, body kit, etc.) basically i can look at your car and see my how my car would be in the future lol.

blckgagt
03-29-2012, 10:35 AM
What is up with the crazy thread revivals? Guess it could be from the sudden influx of newbies.

99Alero_Boy
04-10-2012, 08:28 AM
I'd rather have them bump old threads than start new ones!