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PostPosted: Mon May 28, 2018 12:00 pm 
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Joined: Wed Jul 28, 2010 7:30 pm
Posts: 43
Car Model: 1986 C900 carb
Hi all, I'm part way doing a gearbox swap on my 1986 carby 900. Whilst the engine is out i've also, welded up the drive shaft tunnels, tidied up the engine bay and generally replaced and bits that are worn out.
The engine is back in with the new gear box but I have encountered and problem! The original box was a GM45610 the new box is a GM45605 from Tr autos 1985 90. The drive shaft cups on the new box appear to be smaller and wont except my drive shafts (I really should have checked this before the box went in!)
So is it a case of fitting earlier inner tripods to my drive shafts, or are the shafts bigger?
or sourcing complete earlier drive shafts, are the hubs and outer joints the same?
or swapping the cups from my old gearbox (which were rather worn anyway)

Any help is appreciated!
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PostPosted: Mon May 28, 2018 1:24 pm 
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Joined: Mon Aug 22, 2016 11:23 am
Posts: 191
Location: Leicestershire
Car Model: 1992 3dr 900i
You can swap cups left to right to avoid worn areas. Do one at a time though.


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PostPosted: Mon May 28, 2018 3:44 pm 
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Joined: Wed Jul 28, 2010 7:30 pm
Posts: 43
Car Model: 1986 C900 carb
That's good to know thanks, so doing a bit of reading I should be able to take the cups from the old box and swap them.


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PostPosted: Mon May 28, 2018 8:04 pm 
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Light Pressure Turbo

Joined: Fri Jun 16, 2006 9:26 pm
Posts: 489
If you change the inner drivers you need to keep the drive flanges with their respective shims matched to the gearbox they came from. So you will need to press out the drivers from the flanges and change them over. Do one at a time so the crown wheel doesn't drop down.

You can't swop the tripods without changing the driveshaft as well, spline size different.

Check that both gearboxes have the same method of centering the gear lever otherwise you will end up with a floppy lever!


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PostPosted: Sun Jun 03, 2018 8:45 am 
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Joined: Wed Jul 28, 2010 7:30 pm
Posts: 43
Car Model: 1986 C900 carb
Thanks for the info, whilst researching gearboxes I'd read about the gear lever centering. So my aim was to find a box with the same method. I hadnt even considered the drive shafts would be different.
Saab certianly liked to constantly modify their designs!

I've got the gearbox seals kit so I will take the opportunity to renew those as well.


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