Quaife 6 Speed Gearkit, Feedback Anyone?
Senior Member
Joined: 07-12-2006
Posts: 1,703
From: NE Ohio
I've got an F40 here at home that I'm using for a 3.1L V6 in a Beretta. Maybe GM didn't use this six speed in the SS because it requires an intermediate shaft & equal length axles, requiring mods to the HHR engine cradle/suspension?
Thread Starter
Joined: 01-24-2008
Posts: 6
From: Tustin, CA
From what I understand, it is no easy task to swap in the F40. It has a different bolt pattern on the bell housing, different axles, and a different shift mechanism. No thanks. I'm still very interested in the Quaife six speed conversion for the F35. If only I knew why the cases were breaking....
I wonder if the Quaife conversion makes the tranny stronger by reason of the two extra bearings that support the ends of the shafts outside of sixth gear? I'll bet that makes a difference, and limits shaft flex.
I wonder if the Quaife conversion makes the tranny stronger by reason of the two extra bearings that support the ends of the shafts outside of sixth gear? I'll bet that makes a difference, and limits shaft flex.
Senior Member
Joined: 11-27-2007
Posts: 1,115
From: Austin, Texas
From this specification it looks like a stock SS is right at the torque rating of the F35. Probably conservative, still....I wonder how much more we can safely boost the power: http://www.gminsidenews.com/index.php?page=trans_guide
Member
Joined: 06-14-2006
Posts: 45
From: alabama
A 6 speed would likely lose acceleration due to the broad torque curve of the LNF with VVT.
As far a "The gearbox scares me....", so it does GM!
That's why they incorporated "launch control" and "no lift shift", which are nothing more that nanny controls to prevent abuse and subsequent warranty claims.
As far a "The gearbox scares me....", so it does GM!
That's why they incorporated "launch control" and "no lift shift", which are nothing more that nanny controls to prevent abuse and subsequent warranty claims.
Banned
Joined: 10-24-2006
Posts: 1,761
From: The Show-Me State
From what I understand, it is no easy task to swap in the F40. It has a different bolt pattern on the bell housing, different axles, and a different shift mechanism. No thanks. I'm still very interested in the Quaife six speed conversion for the F35. If only I knew why the cases were breaking....
F35 will probably take a lot more power and abuse than it's rated for. Just have to be smart in how you use it.
Senior Member
Joined: 11-27-2007
Posts: 1,115
From: Austin, Texas
So now that I have lived with the SS for almost 20,000 miles, I really can see that the 6 speed would be a very nice upgrade. First gets taller (3.00) vs 3.38 stock, which is good since 1st seems too short in most folks opinion I believe, 2nd and 3rd are shorter than stock which means 3rd would be very useful for tight back roads where I find 3rd a bit too tall. Third gear pull with the tune (GM or Hahn/PPC) would be even better than it is now (which is fantastic)! Now slight problem is still almost $4,000. to do this swap.
Senior Member
Joined: 05-06-2008
Posts: 1,076
From: Over here
Senior Member
Joined: 11-27-2007
Posts: 1,115
From: Austin, Texas
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Senior Member
Joined: 05-06-2008
Posts: 1,076
From: Over here
OK, maybe not. I was surfing my way to their site again to send them another query on the subject when I found the following on cobaltss.net...
5-Speed FGP F35 Transmission using Quaife's 6-Speed conversion:
Type: Transverse front wheel drive, five-speed manual transaxle ( Optional with limited slip differential )
Engine range: 2.0L I-4 supercharged
Maximum engine torque: 200 lb-ft ( 271 Nm)
Maximum gearbox torque: 258 lb-ft ( 350 Nm )
Wheel+Tire Circumference: 2044mm
Gear ratios: MU3
First: 2.72
Second: 1.89
Third: 1.368
Fourth: 1.045
Fifth: 0.833
Sixth: 0.704
Reverse: 3.17
Final Drive Ratio: 4.04
So... never mind
5-Speed FGP F35 Transmission using Quaife's 6-Speed conversion:
Type: Transverse front wheel drive, five-speed manual transaxle ( Optional with limited slip differential )
Engine range: 2.0L I-4 supercharged
Maximum engine torque: 200 lb-ft ( 271 Nm)
Maximum gearbox torque: 258 lb-ft ( 350 Nm )
Wheel+Tire Circumference: 2044mm
Gear ratios: MU3
First: 2.72
Second: 1.89
Third: 1.368
Fourth: 1.045
Fifth: 0.833
Sixth: 0.704
Reverse: 3.17
Final Drive Ratio: 4.04
So... never mind
Senior Member
Joined: 01-13-2008
Posts: 4,708
From: Washington State, where it rains
Yup..looks like a good trans for a closed course....no real benefit on the street other then bragging rights and having to shift more. The main reason for more gears is to maintain torque peak,something not lacking in this little motor.