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So I have a 73 Duster with a built 318 and a 8 ¾ 3.55 posi rear end. I cruise at 3000 at 60mph and the SOB gets 9.6mpg when I am really nice to it. haha so I need an overdrive. besides 5k for a Tremec what is the cheapest and best route to go without making new supports and totally reworking the...

Hey guys so I love my duster and the 318 has some get up and go but the cost of the horsepower I put into it is about 10 mpg. I have a 727 in it right now and am considering putting in a 727 with an overdrive for fuel economy. http://en.wikipedia.org/wiki/TorqueFlite this would mean the a518...

MAIN QUESTION. why are there two rows of splines in my 8.75 3.55 posi? and what happens if I don't grab the second row? So I am a bit new on rear ends and have fought a long hard battle with my new one. So here is the condensed version of my story then i'll get to the current problem. you'll...

Okay so I have a 1973 Duster that had a 7 1/4 rear end that measured 51.4 inches outside flange to outside flange. I found an A body 8 3/4 housing on craigslist then found an A body 8 3/4 3.55 posi center section and A-body 8 3/4 axles. I bought them both and put them together. (this was before...