Join Date: Jul 2016
Location: North Louisiana
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Pretty sure that the TH400 was the only auto trans available in a '73 GTO.
"...I'm considering buying a turbo 400 tranny off craigslist for it for $200-400. Would that work with the non original Pontiac 350 motor that's in the car? Or is that a totally crazy idea?..."
If you get a good one, it should work. But you need one for a Pontiac, Olds, or Buick. If you buy a Chevy TH400, you'll need an adapter plate, in order to bolt it up to the Pontiac 350 engine.
Also need a short tail version. Lots of big cars used a long tail TH400. A long tail would require the crossmember to be farther back, and a shorter driveshaft.
Also, the fluid might be leaking from the front seal, rear seal, dipstick tube seal, or pan gasket.
Last edited by bigD; 07-24-2017 at 10:39 PM.