I hit the jackpot today at the local U-pull-it junkyard...

Found a 4x4 S10 Blazer in the yard with low miles, and a 4.11 posi in it...

Got the whole rear for $35...

Got home and swapped the guts into my '85 Z28...

Works great, but the speedo seems to be WAY off now...
I'm guessing maybe 15-20 mph off...

Went from 3.23 open, to 4.11 posi...
Tire size is 235/60R-15

Anyone know part numbers, or where I can find the speedo gears I need ???

My local GM dealers aren't very helpfull with oddball stuff like this...


Thanks in advance

ART

 

Your kind of in a grey area. The best I see was a #14 drive (which I'm not sure you can find) and a #44 driven gear.

You can find #15's for 700R4, and a #45 driven gear, but It might be a little off.
You could change the tire size

Maybe you'll have better luck:

http://www.tciauto.com/tech_info/speedo_gears.htm

BTW: your tire diameter is 26.1

Ron

 

Check out: www.areds.com They sell aftermarket speedometer
gears to transmission rebuilders. The bag has Autry Enterprises
printed on it, but nothing else. I think they also have an 800 #.
Please post your findings