Found some chewed up spider gears and was going to convert my original 3.92 gears with a 9.25. I wanted to see if this will work fine? Or do I need to stick with the 3.92 when switching everything out? And advise will help thanks

 

What are you driving?

If you have an open carrier now, and want some variety of limited slip, just change the carrier. Your gears should work just fine, assuming they didn't get damaged by debris from the spiders.

 

[QUOTE=HeyYou;3512666]What are you driving?

I’m driving a 04 Dodge Ram 1500. Doesn’t look like the other gears are chewed up. Won’t know till I tear everything out tho.

 

Coolness. Moving this to third gen ram section for ya.

 

Have you got a 3.92 4wd with open diff rear? If so, you'll need to have same gear ratio for rear as front.

 

[QUOTE=jrsick;3512692]Have you got a 3.92 4wd with open diff rear? If so, you'll need to have same gear ratio for rear as front.
yes I have the 3.92 4wd. What does that mean to have same gear ratio for rear as front? The 9.25 is the size of the ring gear. The 3.92 is the ratio correct? So I should have to change anything I don’t think.

 

You are correct, 3.92 is the gear ratio. 9.25 is the size of the differential ring gear.
I interpreted your initial post to mean that you were considering other gear ratios. My fault if I misunderstood.
Not all Chrysler 9.25 rear ends are exactly the same. There are some differences in axle shaft lengths so you would need to make sure your components match. Are you going with used diff, or new?
If new, consider pricing out other options. Auburn, Eaton, and Detroit all make locking differentials. Each of the differentials have their strengths and how you use your truck would be the deciding factor. Posi/anti-spin is usually best choice if your use your truck mostly on street. If you spend time off road there are better options. You can also get your current diff rebuilt.
I always thought the 3.92 diffs were all anti-spin. I could definitely be wrong about that though.

 

[QUOTE=jrsick;3512736] yes I’m going with a new 9.25 posi with the rebuild kit to change out all the old bearings also. At eastcoastgearsupply.com

 

Posi? Trying to put GM parts in? Posi-traction® was a GM trademark.

 

It has graduated to a 'generic' term. Posi, Limited Slip, etc. It's just one of those things that folks need to interpret properly.