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I have a '85 lock-up behind my 318 and from what I read here, that makes the tranny a 998, or 999. What the difference between the two, I have no idea. I also read that some folks here changed over their lock-up to a non-lock up allowing them to run any 904 converter. Also, I understand...

I have installed a '76 8 1/4 from an Aspen Wagon into my '85 M Body. Fit was perfect. It came with a 2.71 gears and ran it around for a coule of hundred of miles. On E-Bat, I bought a Dana-Spicer Posi(Is what they called it) unit pt# 75101x. It fits ALL 8 1/4" with a 27 spline axles. I bold...