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Re: Service Parts Identification Codes in glove box? '94 G20
For RPM codes make your gm parts dealer your best buddy.
Or have the run you vin no.
The rear sometimes has a tag on back cover.
But the rear end gears could have been changed .
The best and true way to find the gear ratio is to remove inspection plate and check the ring gear for ratio or count the pinion and ring gear teeth and divide ring gear teeth by pion teeth.
MT
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Remember proper testing gives us the answer to many problems.
MT
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