Posted by Ben on December 18, 02 at 09:25:16:
In Reply to: '99 K2500 6.5TD Axle ratio ... posted by Christophe Salvaing on December 18, 02 at 03:57:17:
Check out #1 Son's personal web page. Hot link below has info under RPO codes section.
You can measure the diff ratio with a bit of string. Here's how:
On a level section of pavement, mark a spot where one tire touches the pavement. This is datum for 1 tire rotation.
Tie a length of string, about 5-6 feet long onto the drive shaft u-joint yoke arm. Or tape it on the drive shaft itself with duct tape.
Roll the vehicle one tire rotation and allow the drive shaft to wind up the string.
Then set the parking brakes and straighten the string windings on the drive shaft so that you can count the number of windings.
Full windings equate to the whole numbers of diff ration. 4.1 will have 4 full windings. 3.73/3.42/etc will have 3 full windings. What is left is fraction of a full winding and percentage of full winding. That is the fractional number. 4.1 will have about 10% of a full winding. 3.73 will have about 73% of a full winding...etc.