OG9-3 Gear To Viggen Gear Box - The Saab Link Forums

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Old 09-30-2017, 03:11 PM   #1
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OG9-3 Gear To Viggen Gear Box

Hi all

I had read that the bell housing of the standard fm55 for the OG9-3 is the exact same as the Viggen's FM55 401?

I am rebuilding a motor and would like to rebuild a trans or update a 9-3/SE/baseline trans with a quaife lsd to fit the b235r Viggen motor build. I am building.

My wonder is what is needed? A parts list would be great!!!

So far I am aware of the 05 crush sleeve update, but wonder about the synchros and potential ratio changes from box to box?

Any help would be greatly appreciated as things are closing in on the home stretch!
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Old 09-30-2017, 05:20 PM   #2
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The only difference between the boxes is the differential itself, sized to either fit the smaller base/SE drive shaft splines or the larger 9-5 splines.

If you're opening a box there are consumables, bare minimum you'll need: 5th gear cover gasket, crush sleeve like you wrote, output shaft nut, and likely a set of differential bearings. To set pre-loads correctly you'll likely need some shims for the differential as well as the input shaft, there's a pin holding the 5th gear shift fork and a seal for the shifter input rod that probably should be replaced too.

I've build 3 of these now, I wouldn't attempt it without the factory tool set (or equal). You'll also want the Saab WIS as well as the Chevy Cobalt SS/Saturn Ion Red-line GM version of the instructions as well to get a different perspective/viewpoint on some of the steps.

There are also degrees of "rebuilding" these. The easiest is to start with a known good box and not disturb the input, output or reverse shaft gearsets--and just swap in a new differential (with new bearings/races) sized for Viggen shafts. Then reassemble and set your pre-loads correctly. Setting the pre-loads correctly is not a trivial thing.

To change overall gear ratios requires a new ring gear and matching output shaft.
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Old 09-30-2017, 05:40 PM   #3
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Quote:
Originally Posted by Trionic3000 View Post
The only difference between the boxes is the differential itself, sized to either fit the smaller base/SE drive shaft splines or the larger 9-5 splines.

If you're opening a box there are consumables, bare minimum you'll need: 5th gear cover gasket, crush sleeve like you wrote, output shaft nut, and likely a set of differential bearings. To set pre-loads correctly you'll likely need some shims for the differential as well as the input shaft, there's a pin holding the 5th gear shift fork and a seal for the shifter input rod that probably should be replaced too.

I've build 3 of these now, I wouldn't attempt it without the factory tool set (or equal). You'll also want the Saab WIS as well as the Chevy Cobalt SS/Saturn Ion Red-line GM version of the instructions as well to get a different perspective/viewpoint on some of the steps.

There are also degrees of "rebuilding" these. The easiest is to start with a known good box and not disturb the input, output or reverse shaft gearsets--and just swap in a new differential (with new bearings/races) sized for Viggen shafts. Then reassemble and set your pre-loads correctly. Setting the pre-loads correctly is not a trivial thing.
Very cool thanks!!!

The box I found is a base 9-3 in good shape. I plan to use the larger differential by quaife for the viggen and I do not plan to rebuild it myself. I don't have the time or tools at the moment and I need to get chop chop on my SPG project.
Thanks again! I believe eeuroparts has a rebuild kit as does Abbott
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