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Tech Question
jay scott, jackson, TN, 70 Plymouth Satellite 318
I have a 3.23 Sure Grip rear end and its a 8¾" housing (it unbolts from the drive shaft side). My question is what faster gears can I put in there? Note that it will be mostly driven in the city and rarely on the highway. I was thinking 3.55 maybe even 4.10. Am I able to to do this with just replacing internal gears or what? Thanks
Jay
Jay, it depends what carrier casting number you have. If your has a number that ends in "742" (1¾" pinion stem) or "489" (1-7/8"), then there's no shortage of aftermarket gearsets from 3.55:1 on up (numerically). The gearset installs quite easily if you have the proper tools and knowledge. (That's a big IF, however).
If yours is the small-pinion pig (#741, 1-3/8"), then you have two choices:
Swap the whole pig (any 8¾" pig will bolt in).
- or -
Find some used gears. There's nothing in the aftermarket.
I'd be remiss in my duties if I didn't make a comment on gear ratio selection: Assuming that your 318 is stock, or close to stock, it is tuned as a low-RPM "torque" engine. Frankly, I think even 3.23 migh be numericaly a bit high!
Rick
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