I know this has come up from time to time, but I didn't find the info I'm looking for in previous threads...

What are the known obstacles to installing the F40 trans in a 2.0 Cobalt application? If this trans is used in some Saabs, does this mean the correct bolt pattern exists? Or were they only used on V6 Saabs?

If the right bolt pattern exists, can the case half from a Saab be installed on a G6 trans? Input shaft?

Does the Saab F40 use the 3 shaft design?

Does the F35 diff interchange?

Any info would be appreciated.

 

I have a friend installing a 6 speed F40 in his Turbo LSJ Atom. I'll give him the heads up about this thread for you.

 

The G6 F40 and the Saab 9-3 2.0T F40 have different bell housings. So the G6 version wont bolt up to the ecotec. But otherwise they are similar. You can get a new pontiac G6 F40 for $400 new. The Saab ones are over $1000 used.

The input shaft is 23teeth / 25mm which is different from the Cobalt. So a new clutch is needed though. The axles use the same teeth and diameter though and mine fit and lock in the transmission just fine.

Best guess for a clutch is something like this exedy since it has the same diameter and the right input shaft specs

Exedy hyper single clutch for the focus
Hyper Single Part # EH01SD
Clutch Cover Type PUSH
Clamp Load (lb) 2655
Disc O. D. (mm) 225
Spline Teeth/Major Dia (mm) 23T/25

After a lot of calling around I figured out the Bellhousing from the Saab version isn't offered even new from the factory. I was lucky and found a guy who sold me his used bellhousing off of a dead saab F40

The shift levers are in different position but should fit up next to the engine fine.

I have a mastershift system which is a programmable paddle shifter. I should be able to hook it right up and just program different cable movements to work with my existing cables. a new manual shifter would be needed and different cable lengths

The quaife LSD is different from the F40 to the F35.

Inside bolt pattern



Pontiac G6 bellhousing bolt pattern


Input shaft



Saab Bellhousing







Saab bellhousing fit on the pontiac F40. perfect fit.



The backup and speed sensors are the same from F40 to F35


So in summary. The Saab 9-3 F40 or a Pontiac G6 F40 wtih the saab bellhousing will bolt right up to the ectoec. A new clutch is needed, The axles should fit fine. The sensors are fine. New shift cables and shifter would be needed. the LSD would need to come from quaife specifically for the F40

The only part I dont know of is mounting in a cobalt.

I haven't mounted it in the Atom yet just because of time.

 

i could have sworn that someone offered a performance 6speed for us??

 

Quaife does, but it's maaaad expensive.

 

the new regal with the lnf has a 6spd manual option.

 

isnt the new buick regal thats coming out have a 6 speed with the LNF? might be an option for us

 

Quaife has the 6 speed conversion for the F35 for something like $4000. But since the Pontiac G6 F40 was only $400 new, it was a project I thought would be fun to try out

 

subd

 

reeeeeeee

 

posts were both at 1:38 fgt

 

I guess they were just HP based then. You still lose

Fkn messican

 

just a random quesiton. if you got the input shafts and everything to mate up and everything just fine and the only thing that doesn't is the bolt pattern from the transmission to the engine. couldn't you cnc an aluminum adapter plate kinda like a wheel hub adapter. bolt it to the engine with a gasket and then bolt the trans to it with a gasket. then just make the neccesary adjustments to the mounts and transaxle?

 

Bolus- thanks for the info. That did answer some of my questions.

I have been looking forward to the Regal trans swap, but that would realistically be a couple years out and still probably expensive then. We have a G6 6 speed sitting here, already.

 

click

 

iv heard bad things about the 6speed trannys from the G6 my Friend who worked for chevy (now bmw)
said that 5th gear basically falls out and takes a **** after like 15k miles

 

The biggest problem is finding that saab bellhousing. I got lucky on that one. Unless you want to buy the whole trans but that defeats the purpose of a inexpensive replacement.

 

Bolus leads the way....going fast...

 

bolus how is the atom? i want one so bad.

 

where did the g6 f40 trans come from for 400 new?

 

After changing them for '07, GM dumped the '06 versions as surplus. The going rate has been dropping for a couple years and seems to be leveling off in the $400-$500 range. I'm guessing the prices will start going back up soon.

 

I got mine from these guys. http://www.schramauto.com/

They had about 40 surplus that were brand new. There are a few other places selling for about $500 new as well.

 

Word

 

Just did some gear calculations, and the gearing is almost identical through 3rd gear as far as relation to rpm and mph. 4th and 5th are actually longer in the F40 and then of course the revs are lower in 6th cruising at 60mph.

Of course I'm using 8k rpm as a shift point and a 24.5" tall tire since that's how tall my slicks are.

Looks like I'll just stick with upgrading to a 4.45 final drive since I'm a drag racer and I'd just like to shorten the gears a bit.

Thanks for all the info though.

RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear
500 3 5 8 11 14 17
600 3 6 9 13 16 20
700 4 7 11 15 19 23
800 4 8 12 17 22 26
900 5 9 14 19 24 30
1000 5 10 16 22 27 33
1100 6 11 17 24 30 36
1200 7 12 19 26 32 40
1300 7 13 20 28 35 43
1400 8 14 22 30 38 46
1500 8 15 23 32 41 50
1600 9 16 25 35 43 53
1700 9 17 26 37 46 56
1800 10 18 28 39 49 60
1900 10 19 30 41 51 63
2000 11 20 31 43 54 66
2100 11 21 33 45 57 70
2200 12 22 34 48 59 73
2300 13 23 36 50 62 76
2400 13 24 37 52 65 79
2500 14 25 39 54 68 83
2600 14 26 40 56 70 86
2700 15 27 42 58 73 89
2800 15 28 44 61 76 93
2900 16 29 45 63 78 96
3000 16 30 47 65 81 99
3100 17 31 48 67 84 103
3200 17 32 50 69 86 106
3300 18 33 51 71 89 109
3400 19 34 53 73 92 113
3500 19 35 54 76 95 116
3600 20 36 56 78 97 119
3700 20 37 58 80 100 123
3800 21 38 59 82 103 126
3900 21 39 61 84 105 129
4000 22 40 62 86 108 132
4100 22 41 64 89 111 136
4200 23 42 65 91 113 139
4300 23 43 67 93 116 142
4400 24 44 68 95 119 146
4500 25 45 70 97 122 149
4600 25 46 72 99 124 152
4700 26 47 73 102 127 156
4800 26 48 75 104 130 159
4900 27 49 76 106 132 162
5000 27 50 78 108 135 166
5100 28 51 79 110 138 169
5200 28 52 81 112 140 172
5300 29 53 82 115 143 176
5400 29 54 84 117 146 179
5500 30 55 86 119 149 182
5600 30 56 87 121 151 185
5700 31 57 89 123 154 189
5800 32 58 90 125 157 192
5900 32 59 92 128 159 195
6000 33 60 93 130 162 199
6100 33 61 95 132 165 202
6200 34 62 96 134 167 205
6300 34 63 98 136 170 209
6400 35 64 100 138 173 212
6500 35 65 101 140 176 215
6600 36 66 103 143 178 219
6700 36 67 104 145 181 222
6800 37 68 106 147 184 225
6900 38 69 107 149 186 228
7000 38 70 109 151 189 232
7100 39 71 110 153 192 235
7200 39 72 112 156 195 238
7300 40 73 114 158 197 242
7400 40 74 115 160 200 245
7500 41 75 117 162 203 248
7600 41 76 118 164 205 252
7700 42 77 120 166 208 255
7800 42 79 121 169 211 258
7900 43 80 123 171 213 262
8000 44 81 124 173 216 265


RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear
500 3 5 8 10 13
600 3 6 9 12 15
700 4 7 11 14 18
800 4 8 12 16 21
900 5 9 14 18 23
1000 5 10 15 20 26
1100 6 11 17 22 28
1200 6 12 18 24 31
1300 7 13 20 26 33
1400 7 14 21 28 36
1500 8 15 23 30 39
1600 9 16 24 32 41
1700 9 17 26 34 44
1800 10 18 27 36 46
1900 10 19 29 38 49
2000 11 20 31 40 51
2100 11 21 32 42 54
2200 12 22 34 44 57
2300 12 24 35 47 59
2400 13 25 37 49 62
2500 13 26 38 51 64
2600 14 27 40 53 67
2700 14 28 41 55 69
2800 15 29 43 57 72
2900 15 30 44 59 75
3000 16 31 46 61 77
3100 17 32 47 63 80
3200 17 33 49 65 82
3300 18 34 50 67 85
3400 18 35 52 69 87
3500 19 36 53 71 90
3600 19 37 55 73 93
3700 20 38 56 75 95
3800 20 39 58 77 98
3900 21 40 59 79 100
4000 21 41 61 81 103
4100 22 42 63 83 105
4200 22 43 64 85 108
4300 23 44 66 87 111
4400 23 45 67 89 113
4500 24 46 69 91 116
4600 24 47 70 93 118
4700 25 48 72 95 121
4800 26 49 73 97 123
4900 26 50 75 99 126
5000 27 51 76 101 129
5100 27 52 78 103 131
5200 28 53 79 105 134
5300 28 54 81 107 136
5400 29 55 82 109 139
5500 29 56 84 111 141
5600 30 57 85 113 144
5700 30 58 87 115 147
5800 31 59 88 117 149
5900 31 60 90 119 152
6000 32 61 92 121 154
6100 32 62 93 123 157
6200 33 63 95 125 159
6300 34 64 96 127 162
6400 34 65 98 129 165
6500 35 66 99 131 167
6600 35 67 101 133 170
6700 36 69 102 135 172
6800 36 70 104 138 175
6900 37 71 105 140 177
7000 37 72 107 142 180
7100 38 73 108 144 183
7200 38 74 110 146 185
7300 39 75 111 148 188
7400 39 76 113 150 190
7500 40 77 114 152 193
7600 40 78 116 154 195
7700 41 79 117 156 198
7800 42 80 119 158 201
7900 42 81 120 160 203
8000 43 82 122 162 206

 

Wow, Schram does have a lot of new ones for $400! If only we could find saab bellhousings. What is the torque rating on the stock GTP clutch? It may be enough for us sub 300wtq M62 guys...That would make this more affordable.

I found a 50k mile saab 6 speed for $850. That's not too bad.