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 1959-1979 Big Pontiac Tech
 Pinion angle
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CAM
Tribal Scout

Australia
9 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

Phil
The Great White Buffalo

USA
7309 Posts

Posted - 27 Feb 2020 :  5:25:58 PM  Show Profile  Reply with Quote
I would look into adjustable upper trailing arms so you can dial that pinion yoke up a bit. If none are available you may be able to use Heim joints with a collar adjuster like a tie rod uses.

Was that car originally equipped with a one or two piece driveshaft? I had a 66 Wildcat that had a 2 piece with a center support. That could account for differing angles from engine to pinion.

Bowties are for Pee-wee Herman. LS swaps in Pontiacs should only apply to Fieros.
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