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Not. Going. To. Happen. Posted by Larry West [Email]  (#1140)  [Profile/Gallery]
(more from Larry West) on Thu, 2 Feb 2012 07:05:23
In Reply to: Fitting a c900 with an auto trans w/ an overdrive..., BAAB  [Profile/Gallery]
, Tue, 31 Jan 2012 20:33:25
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The only add-on OD units attach at the transmission tailshaft which, you may have noticed, a C900 trans does not have.
The best you could do to retain the C900 packaging, would be to find/build a different ring & pinion set, and see if the chain drive at the front can be altered.
All C900 4- and 5-speed chain drive manual transmissions have a 1:1 mechanical top gear. The "overdrive" in top gear that was engineered into many of the later 5-speeds comes from the combination of chain drive gearing and different ring & pinion ratios. If you could have the parts made, you could accomplish the same thing with the Borg Warner 37, though you'd still have a 3-speed.
But in all honesty, if you really need 4 speeds in an auto trans in a Saab, you're going to do one of the following:
1) spend a lot of money, and time, to have some 4-speed auto trans engineered into a package that fits where a BW37 does.
2) spend a lot of money, and time, to have the front end (strut to strut) from an NG900 welded into your C900, and then have to sort out Trionic, the cable clutch, the shifter... and deal with the possible handling issues from a car that wasn't designed this way...
3) spend a whole lot less money, and almost no time, and just find a nice driving NG900 or OG9-3... Or 9000, or 9-5, or...
Mind you, this is from the perspective of it being a **practical** exercise. If you throw practicality out the window, well, you end up with neat cars like that V6 powered 92.
_______________________________________ Current: 2002 9-5 Aero Kombi Cosmic Blue 2000 9-5 SE sedan, Imola Red 1990 900S Rose Quartz, Auto Past: 1999 9-5 LPT Combi 1999 9-5 LPT sedan 2002 9-5 Arc 1990 900 5-speed 1986 900 turbo Convertible 1991 9000 turbo 1980 99 GLi 1986 900 turbo 1986 900 S 1991 900 turbo 1984 900 turbo 1976 99 GL
, Tue, 31 Jan 2012 20:33:25, Thu, 2 Feb 2012 07:05:23 <-- Viewing This Message, Thu, 2 Feb 2012 04:04:35, Tue, 31 Jan 2012 23:46:48
, Wed, 1 Feb 2012 00:53:32, Thu, 2 Feb 2012 15:49:37, Thu, 2 Feb 2012 15:54:36, Thu, 2 Feb 2012 15:56:57, Thu, 2 Feb 2012 15:57:52, Thu, 2 Feb 2012 16:03:34, Wed, 1 Feb 2012 01:11:15, Wed, 1 Feb 2012 01:32:14, Wed, 1 Feb 2012 08:15:00
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