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Re: 99 Gearbox
Posted by Larry West (more from Larry West) on Sun, 15 Apr 2001 13:36:25
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

>>3) what about a 900 5sd conversion?
>
>It's been done.  Doing so requires some changes to the motor/transmission
>mountings.

The only changes absolutely necessary are to the front mounting and 
the shifter. The transmission in a 99 has a cast-in flange to mount 
the transmission (and hence the motor) to the chassis. The 900 uses a 
bolt-on mounting.

There is a problem, though. The early chain-drive 99 transmission 
covers will not work on a 5-speed. There is some part of the casting 
that is wrong, and all the fluid will leak out. However, as I 
understand it, if you have a 1980 or later 99, the front cover of the 
4-speed will work on a 5-speed with no troubles.

The other problem is the shifter itself. There is a white plastic bit 
on the bottom of the shifter housing. this needs to be replaced with 
the appropriate piece from a 5-speed, else you will not get into 5th.

The final thing to consider is centering. Saab used two centering 
mechanisms in the Classic 900. The first involved a shift rod with a 
square on it and rollers & springs to bring the shift lever into the 
3-4 gate if you just let go of it, and it's not in any gear.

The second, and more desirable arrangement, is the 'internal' 
mechanism. This puts a spring on the shifter shaft inside the gearbox.

You will probably need to switch to the later 900 style shift 
coupler. The 99 coupler is a fixed size, but the 900 style allows 
adjustment via a collar & clamp.

Good luck!
-- 
Larry West
NJ Saab Owner's Club

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