The 1947 - Present Chevrolet & GMC Truck Message Board Network - Speedometer requires how many revolutions per mile?

The 1947 - Present Chevrolet & GMC Truck Message Board Network (https://67-72chevytrucks.com/vboard/index.php)

- The 1960 - 1966 Chevrolet & GMC Pickups Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=6)

- - Speedometer requires how many revolutions per mile? (https://67-72chevytrucks.com/vboard/showthread.php?t=697299)

BigSix

02-08-2016 12:17 AM

Speedometer requires how many revolutions per mile?

Since swapping in a Dana 300 tcase I have hooked the speedo cable back up but the speedometer is showing faster than I am actually driving. I would like to correctly calculate which gear to get for my tcase but it requires knowing how many revolutions per mile our speedometers require. The Jeep this transfercase came from required 1000 revolutions of input per mile.

jtrichard

02-08-2016 02:24 AM

Re: Speedometer requires how many revolutions per mile?

Every US speedometer that I've come across is calibrated for 1000 turns per mile. (That's turns of the speedometer cable).

TopFuel1966

02-08-2016 02:58 AM

Re: Speedometer requires how many revolutions per mile?

This link is for GM automatics but it contains a chart and a math formula that you may find useful:

http://www.transmissioncenter.net/sp...n_______va.htm

BigSix

02-08-2016 11:02 AM

Re: Speedometer requires how many revolutions per mile?

Quote:

Originally Posted by jtrichard (Post 7477946)

Every US speedometer that I've come across is calibrated for 1000 turns per mile. (That's turns of the speedometer cable).

Thanks. Safe to assume my GMC is 1000?

jtrichard

02-08-2016 12:38 PM

Re: Speedometer requires how many revolutions per mile?

I would think so

All times are GMT -4. The time now is 06:57 AM.