Re: has anyone fitted a late 9-3 6 speed to a OG 9-3 ? thx ! - Bulletin Board

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Re: has anyone fitted a late 9-3 6 speed to a OG 9-3 ? thx !
Posted by neil dale [Email] (#2111) [Profile/Gallery] (more from neil dale) on Fri, 3 Nov 2017 11:00:12

In Reply to: Re: has anyone fitted a late 9-3 6 speed to a OG 9-3 ?, Nick Taliaferro [Profile/Gallery] , Fri, 3 Nov 2017 05:37:31
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No haven't driven them yet still want to fit a 6 speed. Do I recall you have a partial fix to improve six-speed shifting ? What does it do? Well, I want to do it (fit a six-speed )as It offers at least theoretical advantages = 6 speeds eh? we have extensive experience rebuilding, modifying, improving transmissions (mostly BMW -but motorcycles as well )when you take one apart it is usually obvious what could be improved and not that hard to do it. (in my experience ) Some of our ideas were even incorporated by BMW and used in all the production gear selectors! I had done a modification of a shift quadrant selector mechanism and it was on the desk of a BMW dealer, service managers desk. A factory rep came in was admiring it and said "wow who did this ? " they told him it was a college student working in a local shop (ME ! ) they took pictures, measurements and voila' next year all BMW had essentially an exact copy of my shift quadrant! ( No I never received any fame, compensation, or recognition ) we had been racing BMW and blowing up $700 close ratio gearboxes regularly!( a lot of $ in 1977) we eventually got them to stay together. The OEM design had spiral, helical cut gears that meshed together on the primary, layshaft and output shaft. therein lay the problem! When you got on and off the gas, the shafts were thrust back and forth causing stress on the bearings. A clear design defect and compromise just to have a quieter transmission combined w/ ball bearings (which can theoretically, only take about 50% of their radial load in a thrust mode the bearings burned up, causing the gears to become junk. there was no room to fit an additional bearing to the shaft deal w/ thrust loads which was my first solution! SO we just had straight cut gears made by a local company AGM (Az gear manufacturing ) that used to make the electromechanical servo guidance control systems for old ICBM'S! their gear hobbing (cutting ) machine was in a tiled clean room w/ surgical lights arrayed around it! As I recall, we sent the gears, which were made of "vacum melt unobtainium" (some trick steel alloy made w/ vacuum melting so pure, free of impurities ) up to a company in Phoenix where they were hardened w/ a cyanide gas process! the company president was amused to do a project for a racer! Anyway, the BMW tranny stayed together and I made some $ modifying shift quadrants for locals who enjoyed the silky smooth shifting! So, sounds like one needs to buy an extra 6-speed Saab tranny to have parts? appreciate the heads up ! want to tear one apart anyway to see how it can be improved!

_______________________________________ viggen02

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