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Re: 4spd vs. 5spd Posted by Justin VanAbrahams [Email] (#32) [Profile/Gallery] (more from Justin VanAbrahams) on Mon, 8 Jan 2001 17:57:02 In Reply to: Re: 4spd vs. 5spd, kooch, Mon, 8 Jan 2001 10:26:32 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The bizarre ratios your four-speed boxes is the result of using 5-speed primaries (the chain cogs) with 4-speed insides. Due to the way the Saab 900 gearbox is designed, you can do some crazy stuff by changing the primaries and final drive in relation to the main gear clusters...
For example, my '86 900S runs a 5-speed box using a the "CAFE" main box (clusters + 3.67:1 final drive) with the non-CAFE primaries. I can hit 65mph in 2nd gear, and cruise at 80mph at 3000rpm in 5th. VERY nice for cruising, horribly overgeared for 125hp... :) I plan on building another of these boxes for my '90 SPG at some point - I suspect those ratios would lead to a very fast 900T!
As far as stock 4-speed boxes, both my 4-speed '77 99GL and my first (and now-dead) '79 900T had exactly the same 1-4 ratios as my '85 900T, and a comparison on Turbo! a while back indicated that all of the stock 4-speed boxes were about the same... my 99T is currently in the non-running state, but I'll let everyone know if it's something different once it's on the road. The 5-speed boxes came in about two dozen different flavors, as Saab played with various ratios - pick up the tranny section of the factory repair manuals some time and take a look at all the different ratios - it's nuts. The big obvious changes were the final drive adjustments (to comply with EPA demands) but everything else changed too, at some point or another... and sometimes back again... :)
-Justin
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