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Re: difference between normally aspirated/turbo 5 speed Posted by RS [Email] ![]() ![]() ![]() In Reply to: difference between normally aspirated/turbo 5 speeds, bryan ![]() ![]() |
Part of the different transmission number is that the front mount is hydraulic in the turbos and the front mount is solid for the non-turbos. The "4" after GM means solid front mount and the "5" means it's hydraulic.
the 7 after that means they both have primary sprockets set up for an effective 0.78 final drive ratio.
Below is a link to the twinsaabs.com page with the key for decoding transmission numbers.
In a nutshell, they're interchangable. If you want to keep the same front mount with an n/a to turbo (or vice versa) swap, you can swap primary case covers.
http://www.twinsaabs.com/tranny/tranny_info.html
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