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Have been wanting to put a 5-speed in my '76 and just realized the other day — D'Oh! — that I have an old 5-speed left over from my Datsun truck days. It's a 5-speed out of a 77 or 78 620 truck. Now, according to the one truck manual I still have, both trannies are the same model, but the truck transmission is geared slightly lower in first three gears, fourth is 1:00 for both, and fifth is again slightly lower for the truck. Has anyone used these trannies in Z cars? I couldn't find much about it in the archives. If it would fit, wouldn't the lower gearing make changing to a 3:90 rear unecessary?
 

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Yo Jr.
Yes it'll work. And no, a 3:90 would still be nice to have. Have fun. shane-
 

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Ya, what Shane said. The truck trannies gears aren't that much lower. You probably won't even notice it. Get the 3.90 too.
 
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