rearend

[shawn wills]

81 auto had 2.07 rearend now have 3.7 speedometer reads fast. What speedometer driven gear do i use to correct this?

 

[Pancho]

You could try:

http://www.700r4.com/speedoCalc/speedocalc.shtml

which will at least get your drive-to-driven ratios; but whether or not the correct sets are available for your transmission would be a question for a GM parts department....

/Pancho