Ihave never know what gear was in the 10 bolt in my car. I think I'm going to take off the cover and drain all the oil and count the teeth. What is the proper method of determining the gear ratio? Also what esle should I do other then clean out the grease/oil and refill?

Thanks,...I need a projuect for Saturady morning

Tim

I should of spell checked first sorry..

The gears are stamped on both the ring and pinion with the number of teeth. Ring divided by pinion = ratio.

Or use a grease pencil to mark a tooth and count 'em the hard way.

Be sure to have a new gasket, a scraper, degreaser and a can of paint handy, as well as the lube. And...just to be safe, thanks to one bad experience long ago...I usually crack loose the filler bolt BEFORE I disturb the cover.

Thank you!!! how much oil does it hold? and what should i buy? It is a 1969 would syn. be better or just use what come with it?

3 pints A-9 Hypoid 80-90 is the published capacity and type, fill on a level surface until it reaches the fill hole. If Saf-T-Track be sure to add the GM additive.