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  1. Doubleclutch

    Rear gear mystery???

    Hi Guys I have a 73 RR GTX 440 that appears all original BUT?? it has a performance gear that leaves it buzzing out on the road. I'm thinking of going back to a 3.23. Tack shows 3250 at 60. Its the 8.75 rear and its coded last 3 "489". The gear shop advises that the rear #489 can't take a...
  3. Doubleclutch

    New Car A36 Performance Axel Package?

    Anyone know the spec on A36 trim code? I assume 3.55 rear with sure grip. The car sure turns a lot of RPM for a 3.55? Runs 3300 at 60. Its a very low milage car that might have the axel tag still on it. I'll get under it soon. 73 Roadrunner with P225/70 14 tires. Thanks Chuck
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