mcrotty

Hey guys, I'm looking at a '86 iroc to buy, and I'm wondering what this car comes with as far as trans [700r4] and how to check if it's got posi without jacking it up. I know it is a 305 tpi car but haven't actually looked at the car yet. Thanks for any info.

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JamesC

The following FAQ, assuming the car isn't equipped with a 9-bolt, will provide some info about about the rear (if the car is an auto, it's a 700R4):

http://www.thirdgen.org/techboard/tr...-10-bolts.html (FAQ About 10-Bolts)

Without popping the diff cover, however, determining what's really there after 20+ years is difficult.

JamesC

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Iroc-Z28Man

RPO codes in the glove box and look for a tag bolted to the diff cover that says that it is a pos or limited slip.

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Stephen

After 23 years, donn't assume the original RPO codes are correct anymore.

Tount the gear ratio & check for posi action (assuming it isn't dead or blown), just jack the tires up off the ground & rotate them by hand. Count the # of turns of the tires vs the # of turns of the pinion yoke & you can find the gear ration. All without ever opening the rear end & the oil in it dumping out on you, then having to refill it afterwards.

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mcrotty

All right, so stock with 700r4 and either way on diff, I'll just have to insp. it. Thanks for the tips.