I may be a post ***** and a tool, or probadly even both but does anyone know how, aside from manually checking it, I can find the ratio for my rear. I rear end in question is a '85 GSL rear. Is there a serial number or tag on the rear end it's self that might indicate the ratio? Thanks

 

3.90

 

what would my stockers by in my 1982 'G' be and how do you know this?

 

Unless it is a GSL-SE rearend, it will be 3.90. SE's had like a 4.10 ratio rear, but a taller 5th gear, to give the same (or close) final drive ratio.
http://mazdatrix.com/faq/ratios.htm

 

thanks dude, I guess i need to find a gsl then

 

a GSL-se, my bad. According to the the chart at http://mazdatrix.com/faq/ratios.htm I won't be gaining anything except rear disc brakes. Dam, I was hoping to get some lower gears and disc brakes

 

You could go after market.