Hello all, glad I found this site. I currently have 3.42 gears, and I'd like to get 4.10 gears and a good posi unit. Do I need to buy a 4 series posi unit? Does GM make 4.10 gears for this rear, would that be a good choice as far as streght and price? Or are there less expensive gear sets out there? Any advice would be appreciated.

 

Anybody?

 

Joseph needs to reply on the carrier part, but he installed 4.10s in my truck <img src="images/icons/smile.gif" border="0">

Jason

 

I used Genuine GM production 4.10's in Jason's truck. We used what everyone would call a 3 series posi. Nothing different for 4.10's, we used the same carrier as the GM 3.73's we had installed previously. His truck had 3.42's and a open differential to start. I found a production takeout carrier that was installed the same time as the 3.73 swap. Not sure how much the GM gears run, probably in the $300 range, Jason got a deal for $50.
If I remember correctly you can interchange the 8.5" gears with the 8.6" gears. All the new body'd Silverado's will have the 8.6" ring gear if its a 10-bolt housing.