F25 Cobalt SS Internals Swap Discussion - The Saab Link Forums

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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 07-08-2011, 10:16 AM   #1
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F25 Cobalt SS Internals Swap Discussion

Hey all!

This is my first post on TSL; glad to be a part of the community.

So, there has been talk here and there about swapping the internals of the Cobalt F40 gearbox into our F25s. I know Nick said on his site that it's a direct swap.

Has anyone on here actually done this modification? If so, does it function well? It'd be nice to get a discussion going and perhaps a walkthrough guide and/or PN list. I'd be willing, at some point, to pick up an extra F25 box and put the F40 (6-spd SS, correct me if I'm wrong here) internals in it to test the theory.
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Old 07-08-2011, 02:08 PM   #2
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the quaife 6 speed gearset is actually built for the cobalts, so yes im sure you can swap it in, but i have no idea how or what extra things need to be done. maybe you can figure it out and let us all know
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Old 07-08-2011, 07:13 PM   #3
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There was a thread started about dropping one into a 9k (mentioned that to you earlier today I think), but nothing ever came of it that I recall.
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Old 07-08-2011, 07:25 PM   #4
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I believe jzw or nick t toyed with this or actually completed the swap... I remember there being a thread Bout it
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Old 07-08-2011, 07:45 PM   #5
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I believe jzw or nick t toyed with this or actually completed the swap... I remember there being a thread Bout it
link?
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Old 07-09-2011, 01:56 AM   #6
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NO, no and wrong.
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Old 07-09-2011, 04:33 AM   #7
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NO, no and wrong.
Which part(s) of it?
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Old 07-09-2011, 08:52 AM   #8
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Cobalt F25 to Saab F25 sure, But the F40 is a Totally different animal, I'll get around to tearing apart the F40 i've been sitting on so you guys can see the diffrences. The bolts holding the case together might swap just fine but I'm thinking thats Just about it.



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Old 07-09-2011, 09:08 AM   #9
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the cobalt swap was completed on one 9k.

as far as i know thats all that was ever done.
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Old 07-09-2011, 01:59 PM   #10
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i wonder if the f23 cobalt/saturn/hhr lsd will work on a f25?



and where did you buy that lsd for f25 trans?


http://www.genuinesaab.com/psi/gearbox.htm great write up


"6speed Quaife F25/35 Gearset
There is nothing Saab specific here. The kit was developed to fit the Cobalt SS and similar F35 cars. it just happens to fit in the F25 cases also. For the NG900/9-3 and 9-5 it is a straight swap. For the 9000 94-98 since the trans mount is part of the end case that is changed you have to fabricate a new mount assembly. This is just the gearset and you need to have some extra parts from Saab to make it all work. The final drive can be selected from the few that we have from 4.05 std in 9-3/9-5, 4.45 and 3.82 so you can move the gearing around. You will need to have the ring and pinion as a set. Not the easiest to swap but still an option.
The biggest reason to run the new gearset is the higher first and closer rest of the gears 6th is acutally about the same as the higher geared 9-3s. "
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Old 07-09-2011, 06:48 PM   #11
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F23 is a Gutrag from Italy, Also totally different.

F25's came in Opel, Saab, Vaxhaull, I think Pontiacs, Saturns? & Cobalts.

Mark bought the f25 Diff from Nick like most people. I have got them from Abbot but Nicks prices are Way better.
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Old 07-10-2011, 08:27 PM   #12
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after some reading i think the f35 lsd will work for f25. idk but from what i read both trans are the same except the axle splines
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Old 07-11-2011, 04:11 AM   #13
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you'll need front axles, wheel hubs, and wheel speed sensors off a viggen for it to work
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Old 07-11-2011, 11:06 AM   #14
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you'll need front axles, wheel hubs, and wheel speed sensors off a viggen for it to work
^this!

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Old 07-11-2011, 11:39 AM   #15
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damn thought it was the same. on nicks site it says they are the same except those things you mentioned plus the spline on trans. but internally they are the same? idk

if internals are the same it should be direct swap? i dont see why i would need the speed sensor, axles or wheel hubs if im swaping a lsd and keep the f25 setup. idk tho im researching this trying to learn a little
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Old 07-11-2011, 04:21 PM   #16
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damn thought it was the same. on nicks site it says they are the same except those things you mentioned plus the spline on trans. but internally they are the same? idk

if internals are the same it should be direct swap? i dont see why i would need the speed sensor, axles or wheel hubs if im swaping a lsd and keep the f25 setup. idk tho im researching this trying to learn a little
You Just need the LSD that Fits the F25. Its a Different part than the one listed for the F35 Viggen&95/Cobalt. The f25= Small axle, F35 =Big axle.
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Old 07-15-2011, 08:00 AM   #17
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You Just need the LSD that Fits the F25. Its a Different part than the one listed for the F35 Viggen&95/Cobalt. The f25= Small axle, F35 =Big axle.
can you fit the inside part of a bigger axle to the smaller axle? so it fits or no
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Old 07-15-2011, 09:32 AM   #18
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Coabalt SS/sc is using the F35 With Ecotec bellhousing and cable shift. This is the same part as used in the 9-3 2003 onwards. There are some with gearing differences HHRvs Cobalt etc. These internals work in F35 rod shift 9-3 99-02 and older 94-98 F25 if you carefully swap the right parts.

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can you fit the inside part of a bigger axle to the smaller axle? so it fits or no
F35Diff and /Viggen/9-5 Diff Bearing retainer are all that you need to make a Normal 9-3 99-02 into a Viggen. Easy enough when setting Diff preload to swap the cover



All you need swapping to Viggen axles is to clearance the upright for the ABS ring and the Vig specific ABS sensor BRACKETs to space the factory sensors out more to accomodate the larger 9-5 style outer CV.



There are variations of the F25 and also the F35. That is not all you need to describe the -box.

F40 was never in Cobalt, Internals wont swap to F35 at all but for the Diff Bearings. They are the same.
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 07-16-2011, 03:22 AM   #19
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Coabalt SS/sc is using the F35 With Ecotec bellhousing and cable shift. This is the same part as used in the 9-3 2003 onwards. There are some with gearing differences HHRvs Cobalt etc. These internals work in F35 rod shift 9-3 99-02 and older 94-98 F25 if you carefully swap the right parts.



F35Diff and /Viggen/9-5 Diff Bearing retainer are all that you need to make a Normal 9-3 99-02 into a Viggen. Easy enough when setting Diff preload to swap the cover



All you need swapping to Viggen axles is to clearance the upright for the ABS ring and the Vig specific ABS sensor BRACKETs to space the factory sensors out more to accomodate the larger 9-5 style outer CV.



There are variations of the F25 and also the F35. That is not all you need to describe the -box.

F40 was never in Cobalt, Internals wont swap to F35 at all but for the Diff Bearings. They are the same.
Sorry for thread hijack, but I wonder is there any gearbox which is direct swap to 98-02 9-3's? I mean, considering that converting to cable shift is not an issue...
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Old 07-16-2011, 08:07 PM   #20
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Lets compare Diffs, F35 Left, F25 right
Take notice of the Extension on the F35 to take the Load of the drivers side axle. Its a big improvement over the Bushing we are replacing these days on the F25's




Spider gears on the f35 are Just plain Bigger


F35


F25


Axle's F35 Left F25 right.
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