Jeep Wrangler Forum

Jeep Wrangler Forum (http://www.wranglerforum.com/)
-   TJ General Discussion Forum (http://www.wranglerforum.com/f282/)
-   -   Diff Questions And Help?? (http://www.wranglerforum.com/f282/diff-questions-and-help-111470.html)

WRX PELICAN 09-06-2011 05:10 PM

Diff Questions And Help??
 
Hey everyone, so I know this is going to sound like a dumb question to all and I know the answer in some ways but im sure some of you guys know more about it than I do so heres my question..

What are the benefits of switching diffs and also the cons? I run 31s so I know i dont really neeeed to but im still thinking about it just so my jeep runs better so what would you guys suggest for me?

and lastly, forgive my bad questions :hide: but i just want to double check that im right. I have a 98 TJ Sahara so whats the stock diff on it?

thanks

InvertChaos 09-06-2011 05:14 PM

I wouldn't regear for 31" tires. The cost just doesn't justify it, especially if you end up moving to a larger tire later. There were 5 different gearing options for the TJ depending on engine, transmission, and options. The best way to find out what you have is to read the metal tag on the diff at the 9 o clock position. :wavey:

WRX PELICAN 09-06-2011 05:16 PM

Quote:

Originally Posted by InvertChaos (Post 1545250)
I wouldn't regear for 31" tires. The cost just doesn't justify it, especially if you end up moving to a larger tire later. There were 5 different gearing options for the TJ depending on engine, transmission, and options. The best way to find out what you have is to read the metal tag on the diff at the 9 o clock position.

I know thats why im asking, i tried but it practically unreadable (and I cleaned it obviously) but if it helps I have a 4.0 6cyl auto

InvertChaos 09-06-2011 05:18 PM

Quote:

Originally Posted by WRX PELICAN

I know thats why im asking, i tried but it practically unreadable (and I cleaned it obviously) but if it helps I have a 4.0 6cyl auto

Gotcha. In that case either Jack up the rear end, put it in neutral, chock the front tires, and spin the rear tire once if you have limited slip or twice is its open while counting driveshaft rotations. Or you could either go to a Jeep dealer or email Jeep your VIN and get a build sheet.

WRX PELICAN 09-06-2011 05:23 PM

Quote:

Originally Posted by InvertChaos (Post 1545262)
Gotcha. In that case either Jack up the rear end, put it in neutral, chock the front tires, and spin the rear tire once if you have limited slip or twice is its open while counting driveshaft rotations. Or you could either go to a Jeep dealer or email Jeep your VIN and get a build sheet.

k ill try it out thanks

Decimus 09-06-2011 05:28 PM

You either have a Dana 35 or a Dana 44 which was optional. Here is a link that will help determine what diff you have.
http://www.wranglerforum.com/f5/tj-l...ion-50307.html
If you have the Dana 44 you wouldn't need to upgrade at all unless you want to run a tire over 33". What do you want to be able to do with your Jeep? That will determine whether you need to upgrade your axles or not.

InvertChaos 09-06-2011 05:42 PM

Quote:

Originally Posted by Decimus
You either have a Dana 35 or a Dana 44 which was optional. Here is a link that will help determine what diff you have.
http://www.wranglerforum.com/f5/tj-l...ion-50307.html
If you have the Dana 44 you wouldn't need to upgrade at all unless you want to run a tire over 33". What do you want to be able to do with your Jeep? That will determine whether you need to upgrade your axles or not.

I think he was talking about swapping out the diff gears, not the axle itself. I may be wrong though.

WRX PELICAN 09-06-2011 05:43 PM

Quote:

Originally Posted by InvertChaos (Post 1545340)
I think he was talking about swapping out the diff gears, not the axle itself. I may be wrong though.

yea just gears, but anything helps

InvertChaos 09-06-2011 05:47 PM

Quote:

Originally Posted by WRX PELICAN

yea just gears, but anything helps

You have the 3 speed auto which is super tolerable with taller tires so even if you have 3.07s that's about the sweet spot with 31" tires. Do you have a hitch reciever from the factory? If so you may have a "tow package" and have 3.55s or 3.73s. But really I couldn't justify spending $1200-1800 to regear for a tire as small as a 31.

Decimus 09-06-2011 05:50 PM

Oh my bad. I read the part about switching diffs on original post so I thought the diff itself not the gears. Good luck figuring out what you have.

WRX PELICAN 09-06-2011 05:56 PM

Quote:

Originally Posted by InvertChaos (Post 1545356)
You have the 3 speed auto which is super tolerable with taller tires so even if you have 3.07s that's about the sweet spot with 31" tires. Do you have a hitch reciever from the factory? If so you may have a "tow package" and have 3.55s or 3.73s. But really I couldn't justify spending $1200-1800 to regear for a tire as small as a 31.

no no tow package but yea i doubt I will, just thinking about it for future mods


All times are GMT -5. The time now is 05:02 AM.