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 1959-1979 Big Pontiac Tech
 Pinion angle
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CAM
Tribal Scout

Australia
8 Posts

Posted - 30 Nov 2019 :  11:49:25 PM  Show Profile  Reply with Quote
Hi, I am driving a 64 Catalina, 389 and t700R4, standard 3.42 diff, with standard training arms, new bushes.

Had a slight vibration at about 70mph so decided to check the pinion angle. WOA!!! All stock the engine/trans are 3 degrees down (ie. back is lower than front of engine, BUT the diff is the excat opposite (ie. diff yolk is 3 degrees, lower at the yolk than at the housing.. this is exactly opposite to how I think it should be. Diff pinion should be parallel to the crank, and the crank should point down slightly, front to rear.

BUT the diff and arms are 100$ 1964 stock.... or is it? What gives? Did Pontiac do something really strange?

Cheers and thanks
CAM

64 Catalina, 389, EFI, T700R4
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