2005 dodge ram 2500 SLT HD 5.7 4x4.
want to change my gearing from stock, which I think is 3.73 over to 4.56. axles tubes up front and outback are both 3.5" in diameter. 14 bolt. What i don't know is do I have 10.5" setup in back and front or 10.5" in rear and 9.25" up front. If anyone knows the specs, please enlighten me. And also a ball park figure to change both out$$?? And a list of parts needed if it's just a simple swap. (Providing everything looks good upon tearing apart) thanks in advance for any advice

 

You can get a build sheet from here, that will tell you what axles you have.

You are probably looking at 1500 to 2000 to change gears in both axles. NOT something for the average shade tree mechanic. Do it wrong, and at best, they will be noisy, at worst, they will destroy the gears...... not a good scene at freeway speeds. (or, anything faster than a brisk walk, for that matter....)

 

Have to ask: Why?

 

Just want a little more go upon take off and also in the near future I'm goin to have a 6" long long arm lift installed, so I think those gears will help me move the larger tires I will have. 36 or 37's I'm thinking. Also adding a couple of bolt on bolt on accessories and after all that is installed will have some custom tuning done with a Diablo Trinity by one of our local shops.

 

My 2005 2500 SLT has 9 1/4 front and 10.5 back. So yours should be the same in a Gas model. Diesel's would have 11.5 in the rear. The 10.5 rear gears are kind of pricey. I had my rear diff rebuilt at a shop cost 1200. The ring and pinion alone was $495.

 

Thanks for the Intel .that helps. I got a tune and machine shop to do the front for 400 and the rear for 300. I just got to buy all the materials . So not to bad.

 

Anybody purchased anything from a site called (justdifferential.com)? Is the site legitimate and products authentic? 9.25 456 up front and 10.5 456 in the rear. And master install kits for both, just over $1200. Local machine and performance shop install cost, $300 rear and 400 for the front. Thoughts, advice welcomed. Trying to get some Intel on the site and their products that I mentioned above. (Just differential.com). Thanks in advance.