Since I got some new tires and rims I want to bump up my rearend to 3.73. Since I'm in there I was going to upgrade to the eaton posi. Does anyone know what the part number is for the eaton for a 01 gm sierra ext cab 1/2 ton with the 3.42s. I think that I have the 8.5 10 bolt rear end but I'm not sure. Is this correct? I wanted to do a little shopping around for a decent price on both gears and the eaton and I want to make sure that I got the right part numbers and specs for the stuff I need.
Thanks in advance,
Lar

 

19559 for eaton posi for 01 truck just like the one installed in mine.
Look on ebay, that's where I got mine for $350
*Edit*
http://cgi.ebay.com/ws/eBayISAPI.dll...11769&rd=1
Thats for eaton posi, any gear ration you want and the install kit with everything needed for an install. All you need is the labor.
I called them and talked to Ronnie, very nice guy, answered all my questions.
That package is in my truck right now....damn the break-in period
But if you want some 3.73 gears, I got my stock ones for sale since I put the 4.10s in

 

Chingon, What about for a 00 truck? Would it be the same? Also would those gears fit with a 00 and how much you asking if you still currently have them? Thanks

 

Call matt at randys ring and pinion tell him what you have and what you want and you should have the gears/posi and a nice install kit to your door in less than 4 days.
I told him that guys would be calling and should give you a good deal.
I purchased 4:10 factory,install kit and a eaton posi.
On top of that Matt seems pretty knowledgable, not just a salesmen typing in Part numbers.
Just my 2$

 

I wanna say randys quoted me like 311 bucks for the posi. Of course, i got a package discount cause he priced it will new gears for my front diff, my back diff, and install kits front and back.

 

The 99-02 are the same rear end (10-bolt, 8.6")
I still have the gears for sale, they have about 48k babied miles on em...sending you a PM...