03-03-2008, 12:34 PM
There should be a metal tag under one of the bolts. It will have a code that looks like: 3 L 50. This would be a 3.50 gear, which is most common, and the L is a TracLok diff.
If you can not find a tag, you can tape a piece of string to your drive shaft, place a mark on a tire, roll the truck forward one tire revolution, and then count the wraps of the string on your drive shaft. If is wraps about 3 1/2 times you have 3.50 gears, just a bit over 4 and you most likely have 4.10, and if it wraps 4 1/2 time you'd have 4.56.
Then to tell what diff you have you jack up the rear and put the trans in neutral. Turn one tire and watch the direction the other tire turns. If they turn in the same direction you have a TracLok, Posi, or locker of some sort. If the tires spin in opposite directions or seem to spin independent of each other the diff is open or standard spiders.
If you can not find a tag, you can tape a piece of string to your drive shaft, place a mark on a tire, roll the truck forward one tire revolution, and then count the wraps of the string on your drive shaft. If is wraps about 3 1/2 times you have 3.50 gears, just a bit over 4 and you most likely have 4.10, and if it wraps 4 1/2 time you'd have 4.56.
Then to tell what diff you have you jack up the rear and put the trans in neutral. Turn one tire and watch the direction the other tire turns. If they turn in the same direction you have a TracLok, Posi, or locker of some sort. If the tires spin in opposite directions or seem to spin independent of each other the diff is open or standard spiders.