i have a 95 4.3 motor. its 4x4. what size gears come in the rear end? and what size can i change them to make my truck a little faster?

 

you have a 4x4, if you change one, you HAVE to change both. other wise the first time you put it in 4 wheel drive, either high or low, you will pretty much split your transfer case in half and cost yourself pounds of money. notice i wrote pounds of money.

so long as you know that, check this out.

 

You can look at the RPO in your glove box to find which gear set your truck came with. There's 4 options for the S-series trucks:
- GU4 3.08
- GU6 3.42
- GT4 3.73
- GT5 4.10