Have a 1979 Pontiac Trans Am with 241 gears and would like to know exactly what parts I have to order to switch to a 355 or 373 gear? I do not want to use a spacer heard to many bad things about one. Any help would be greatly appreciated.
OK, so you have a 2 series differential and you are going to need a 3 series, which Imsport has already found for you. I do not recommend the Ratech installation kit. They have junk shims in them. The kits from Tom's Differentials are the best. Yukon is next and the USA Standard kits are next after that. If you get a kit and it has ring gear bolts with 5/8 heads on them DO NOT use them. Only use bolts with 3/4 inch heads.
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