73-87 Chevy _ GMC Trucks > Instrumentation

Tooth count of speedometer driven gear in TH350?

(1/3) > >>

75ChevDrvr:
Does anyone happen to know or can you find out what the tooth count is for the speedometer driven gear in a TH350.  The truck it came from is a 1975 C10.  Even the tooth count for the drive gear would work.  I just need to figure this out because I can't find my old one.

Thanks!

roundedline:
It really depends on your rearend ratio:
73-87.com/7387garage/driv...speedo.htm
Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project

75ChevDrvr:
True...  It's 3.73 in my truck (stock from the factory).  I don't know what the original tire size was, but it came with 16" wheels.  I do know that I'm running slightly larger tires (265/75-R16) and the speedo always used to be off by a bit.  If I could figure out what the drive gear is, I could get the appropriate driven gear.  If I could figure out what the stock driven gear was, I could figure out what it should be.  

VileZambonie:
chevelleengineer.home.com...speedo.htm

75ChevDrvr:
I've got about four different sources with the same info on how to calculate the speedometer driven or drive gear now.  What I don't know is the tooth count of either one.  Can anyone help??

Navigation

[0] Message Index

[#] Next page