Manitoba SS 2014
03-03-2014, 04:47 PM
#288
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Excuse my ignorance here.
In the past when I have needed to upgrade transmission I go to a local tranny shop and tell them what kind of goals I'm looking for and they build up the trans to handle them.
This has been with powerglides , TH350, 700R4, typical chev stuff. Granted these are all automatic, very popular trannys
My question is why can this not be done for the cobalt trans. Are the shops currently offering the "Stage" transmissions custom machining the parts they are upgrading?
In the past when I have needed to upgrade transmission I go to a local tranny shop and tell them what kind of goals I'm looking for and they build up the trans to handle them.
This has been with powerglides , TH350, 700R4, typical chev stuff. Granted these are all automatic, very popular trannys
My question is why can this not be done for the cobalt trans. Are the shops currently offering the "Stage" transmissions custom machining the parts they are upgrading?
03-03-2014, 04:53 PM
#289
No one really makes aftermarket parts for the insides of these trans', and because of that there are very few options. Also, the fact that the F35 is a single shaft design leaves a lot of room for flex, which lets the gears pull apart a bit, and shreds the teeth off of the gears (usually 3rd). What shops have been doing is harvesting 4.45 gears out of Saturn L series cars and swapping them into the F35 along with new crush washers, stronger case bolts, sometimes case reinforcement, and sometimes shot peening the gears.
03-03-2014, 11:34 PM
#296
I would have to do some research on this. Different cars run different final drives. The gear ratio's are shorter so I guess it would be better to have a taller final drive? Otherwise you would be shifting like a mad man lol. Taylor, thoughts?
Applications
Final Drive: 3.94
2000–2005 Chevrolet Cavalier
2000–2005 Pontiac Sunfire
2000–2005 Pontiac Grand Am
2000–2004 Oldsmobile Alero
Final Drive: 3.84
2005–2007 Chevrolet Cobalt
2009-2010 Chevrolet Cobalt (economy package 3.63:1 FDR is RPO FY1)
2005–2007 Pontiac G5
2003–2007 Saturn Ion
Opel Corsa
Opel Astra
2000–2002 Opel Vectra B
Opel Combo
Opel Zafira
Opel Tigra
Opel Speedster
Saturn L-series
Chevrolet Malibu
Final Drive: 4.17
2005–2007 Chevrolet HHR
2009-2010 Chevrolet HHR is 3.95:1 FDR
Applications
Final Drive: 3.94
2000–2005 Chevrolet Cavalier
2000–2005 Pontiac Sunfire
2000–2005 Pontiac Grand Am
2000–2004 Oldsmobile Alero
Final Drive: 3.84
2005–2007 Chevrolet Cobalt
2009-2010 Chevrolet Cobalt (economy package 3.63:1 FDR is RPO FY1)
2005–2007 Pontiac G5
2003–2007 Saturn Ion
Opel Corsa
Opel Astra
2000–2002 Opel Vectra B
Opel Combo
Opel Zafira
Opel Tigra
Opel Speedster
Saturn L-series
Chevrolet Malibu
Final Drive: 4.17
2005–2007 Chevrolet HHR
2009-2010 Chevrolet HHR is 3.95:1 FDR
03-04-2014, 12:44 AM
#297
The 3.84 and 3.94 shouldn't be too far apart. The 4.17 I feel would be too short, and you'd be shifting a bit too much. Overall strength would be a little better with the shorter final drive though. Revving to 8k I think the 3.84 or 3.94 would make for a nice setup though. You remember Jarrods gears? Add another 1,000 Rpms like you will be doing and it would make for a nice balance between strength and gearing.
03-04-2014, 02:15 AM
#299
Probably depends what your using it for. Shirt gears in road racing can help keep you in the torque band. But in drag racing it really just means more shifting.
If it's time to shift half a second before the end of the quarter a higher final dive could help you get into gear a little sooner to take advantage of the last gear instead of being on the brink possibly not needing to shift.
With my car riding out 3rd gear I noticed a lower trap but an equal e/t. I have to shift so close to the end of the quarter that shifting into 4th is not helpful yet I gain a mph or 2.
If I had a 4.05 trans It would probably let me make use of 4th and possibly trap the extra speed and gain some 10ths
If it's time to shift half a second before the end of the quarter a higher final dive could help you get into gear a little sooner to take advantage of the last gear instead of being on the brink possibly not needing to shift.
With my car riding out 3rd gear I noticed a lower trap but an equal e/t. I have to shift so close to the end of the quarter that shifting into 4th is not helpful yet I gain a mph or 2.
If I had a 4.05 trans It would probably let me make use of 4th and possibly trap the extra speed and gain some 10ths