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F40 6 speed Transmission ( UPDATED !!! )

Transmissions, Clutches, torque converters, Gear ratios, Brakes, Pads, etc.

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Re: F40 6 speed Transmission ( UPDATED !!! )

Postby exist3nce » Mon Apr 13, 2009 12:31 am

One of my friends is custom fitting a F40 into his 2004 Grand Prix (will be the first manual grand prix in Canada). He has been using the 4T65E up until now, and has has nothing but problems. Its been built and upgraded with almost every possible part you can put in, but still it cannot hold the power he is making. Last dyno was 581whp on STOCK bottom end..... with the transmission slipping pretty bad. I'll post up some pictures and whatnot when its completed.
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Re: F40 6 speed Transmission ( UPDATED !!! )

Postby PrecisionBoost » Mon Apr 13, 2009 12:36 am

There are a number of guys using the F40 with Corvette V8 engines
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Re: F40 6 speed Transmission ( UPDATED !!! )

Postby exist3nce » Mon Apr 13, 2009 12:39 am

PrecisionBoost wrote:There are a number of guys using the F40 with Corvette V8 engines



His is the V6 3800...... was originally supercharged, now has a T72 on it lol.
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difference in engine blocks

Postby Davinci_360 » Sat Apr 18, 2009 2:01 am

GsiTurbo wrote:Interesting... I was using C20GET auto block, and had to grind one corner to fit F16. Possibly this is a difference between the markets.


So, I have a '90 Turbo Sunbird with the automatic ... sounds like I might want to find out if anyone I know has a grinder. Does anyone have any pics of the two different blocks? It'd be nice to know what I'm up against here ...

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Re: F40 6 speed Transmission ( UPDATED !!! )

Postby xiaogary » Sat Jul 25, 2009 9:55 pm

Whats the number of spline and diameter of the shaft for F40?
Does that means different flywheel and clutch kit need to be use?
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Re: F40 6 speed Transmission ( UPDATED !!! )

Postby exist3nce » Fri Jul 31, 2009 4:17 am

xiaogary wrote:Whats the number of spline and diameter of the shaft for F40?
Does that means different flywheel and clutch kit need to be use?



Its a 1" 23 spline for the F40 ..... I will try to double check tomorrow. We're in the middle of swapping a F40 trans into a 2004 Pontiac Grand Prix GTP at the shop I'm working at.

EDIT: corrected spline count.
Last edited by exist3nce on Fri Jul 31, 2009 5:32 pm, edited 1 time in total.
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F40 Destroyed!

Postby exist3nce » Fri Jul 31, 2009 4:39 am

Just as a follow up, the F40 has been in the Grand Prix for about 2 weeks.... but something has gone terribly wrong. The owner says he did a 2nd-3rd-4th pull shifting at redline (about 6200rpm) each gear. When he shifted into 4th, he heard a bang and then crunching. After that, 2nd gear was GONE (as if it was in neutral) and you could not get into 5th and 6th. Since I now work at the performance shop he goes to, I got to take it apart today. Heres the pictures of the destruction!!!

Can anyone figure out how 2nd gear got destroyed while shifting into 4th ? (He didn't mishift so far as we know)

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Image Image

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Re: F40 6 speed Transmission ( UPDATED !!! )

Postby WOLFMAN AK907 » Fri Jul 31, 2009 5:31 am

Ouch! I wonder if this could work in a 1.6L Ecotec Aveo? I have an 09'. A six speed would be great.
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Re: F40 6 speed Transmission ( UPDATED !!! )

Postby wolfsreign » Tue Aug 04, 2009 7:54 am

about the tranny from hell, all i can say is maybe something go into it and just got in between and blew it apart. or it was just weak metal from the start and the heat got to it.
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2nd F40 Destroyed

Postby exist3nce » Fri Aug 07, 2009 5:47 am

Its happened again.... my friend's 2nd new F40 gearbox has exploded within a week of coming back on the road. Exact same situation as last time... went to redline in 3rd, then shift to 4th and as soon as the clutch was let go, KABOOM. It was a much more dramatic death this time... it actually ripped through the casing somewhere (we can't see where yet) and pissed out all the fluid within a few minutes on the side of the road. I can only imagine what the inside looks like now :(

He was running 18psi on a T66, headwork, cam, 3" straight exhaust, triple disc clutch...... i guess this combo is just too much for the poor F40.

BTW I can get brand new F40 6 speeds pretty cheap if anyone wants them.
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Re: F40 6 speed Transmission ( UPDATED !!! )

Postby mr_g » Fri Aug 21, 2009 11:20 am

Will F40 fit C20LET engines?
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Re: 2nd F40 Destroyed

Postby xiaogary » Fri Oct 16, 2009 3:13 pm

exist3nce wrote:Its happened again.... my friend's 2nd new F40 gearbox has exploded within a week of coming back on the road. Exact same situation as last time... went to redline in 3rd, then shift to 4th and as soon as the clutch was let go, KABOOM. It was a much more dramatic death this time... it actually ripped through the casing somewhere (we can't see where yet) and pissed out all the fluid within a few minutes on the side of the road. I can only imagine what the inside looks like now :(

He was running 18psi on a T66, headwork, cam, 3" straight exhaust, triple disc clutch...... i guess this combo is just too much for the poor F40.

BTW I can get brand new F40 6 speeds pretty cheap if anyone wants them.



Can it fit an aveo currently with an F16 transmission?
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Re: 2nd F40 Destroyed

Postby PrecisionBoost » Thu Oct 22, 2009 4:57 am

exist3nce wrote:He was running 18psi on a T66, headwork, cam, 3" straight exhaust, triple disc clutch...... i guess this combo is just too much for the poor F40.

BTW I can get brand new F40 6 speeds pretty cheap if anyone wants them.


Well.... that is a shitload of power.... must be running quite a bit of torque as well.

It's too bad the F40 wouldn't hold up.... seems hard to find good FWD gearboxes that will take that much power.

I researched quite a number of different gearboxes OEM and Aftermarket.... seems like anything over 350 lb ft gets expensive.

When I was looking for something to handle 600 lbft the cheapest option I found was over $10K.... the most economical was installing a Quaife dog gear set.

Hmmm.... this is a very good article on the Saab gearboxes.... they talk about the rare "euro diesel" F40 I found however many years ago.... cool... I guess I'm not crazy after all :roll:

http://trolltuner.com/?p=62
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Re: F40 6 speed Transmission ( UPDATED !!! )

Postby mr_g » Wed Oct 20, 2010 8:31 am

PBoost, did you fit F40 on 2.0 block as you mentioned or didn't? What are you running now?

I have broken 2pcs F28 the same way (one was old, one was almost brand new, both broke the same way)...
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Re: F40 6 speed Transmission ( UPDATED !!! )

Postby exist3nce » Wed Oct 20, 2010 8:16 pm

Whoa, poor F28 box. How much torque and power are you pushing through it when it broke? I ask this question because I have the same gearbox!
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