I had a 77 Aspen RT with four speed OD behind the 318 about 30 years ago. Seemed like a decent transmission but he motor had no balls. I've seen where folks have adapted E-body tailshaf housings onto the aluminum case A833 OD transmissions. Do these have the strength to live behind a 400-450 lb-ft motor? Really just a three speed with an extra gear isn't it. 3rd is 1:1?