Rear Gears, Transmission Combo - Pontiac GTO Forum
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post #1 of 3 (permalink) Old 05-07-2012, 04:28 PM Thread Starter
 
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Rear Gears, Transmission Combo

I have been trying to locate my receipt for a posi differential rebuild that I had done on my 65 GTO a few years back. This car is still in the final restoration phase and has not been driven. Looks like I have misplaced the bill and am trying to recall the gears that were installed. I seem to recall 2:78. Not sure if that combination exists, but would like to know if anyone has that combination. Also would that gear ratio work with a Turbo 400? I should mention that the car has a rebuilt 389 with Tripower. Thanks
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post #2 of 3 (permalink) Old 05-07-2012, 05:23 PM
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2.78 is a stock ratio, an excellent high speed, mpg, and cruising gear. It will work great with the TH400. I swapped out the 3.36 gear in my TH400-equipped '67 a couple of years back with a 2.56 gear, and I love the fuel economy and comfortable highway cruising. 75 mph is about 2450 rpm....and 3000 rpm is a tick over 90mph. With $4 fuel, it sure is nice.
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post #3 of 3 (permalink) Old 05-08-2012, 08:53 AM Thread Starter
 
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Thanks for the reply. Finally found my paper work and 2:78 is correct. I have been working on this project for so many years I have to rely on my bills to help recall what I had done on the internals.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions.

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