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IROCdan330 · 02-20-2008, 06:17 AM

ron...if you have a mechanical speedo:

you will most likely need to change your drive/driven gear, both in the tailshaft of the trans.

www.700r4.com has got a speedo calculator to know which combo you need.

and like WildBillyT said, tire size is of concern for it to be accurate, and that calculator uses it.

Keep in mind, if you go over a certain tooth (39) driven gear, you will need a 40-45 tooth carrier, sort of like a 2 series and 3 series carrier in a diff.

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

gears/carriers:
http://www.bowtieoverdrives.com/cata...BCAT&CATID=DA2

02-20-2008, 06:17 AM	#4
IROCdan330 12 Second Club Join Date: Sep 2004 Location: Vineland Posts: 928 iTrader: (0)	ron...if you have a mechanical speedo: you will most likely need to change your drive/driven gear, both in the tailshaft of the trans. www.700r4.com has got a speedo calculator to know which combo you need. and like WildBillyT said, tire size is of concern for it to be accurate, and that calculator uses it. Keep in mind, if you go over a certain tooth (39) driven gear, you will need a 40-45 tooth carrier, sort of like a 2 series and 3 series carrier in a diff. calculator: http://700r4.com/speedoCalc/speedocalc.shtml gears/carriers: http://www.bowtieoverdrives.com/cata...BCAT&CATID=DA2 __________________ 87 iroc with the usual go fast stuff heavier than your half ton. Last edited by IROCdan330; 02-20-2008 at 06:18 AM.