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Tribal Scout

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

64 Catalina, 389, EFI, T700R4

The Great White Buffalo

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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