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Old 09-06-2011, 05:10 PM   #1
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Post 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 but i just want to double check that im right. I have a 98 TJ Sahara so whats the stock diff on it?

thanks

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Old 09-06-2011, 05:14 PM   #2
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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.

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Old 09-06-2011, 05:16 PM   #3
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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
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Old 09-06-2011, 05:18 PM   #4
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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.
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Old 09-06-2011, 05:23 PM   #5
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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
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Old 09-06-2011, 05:28 PM   #6
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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.
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Old 09-06-2011, 05:42 PM   #7
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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.
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Old 09-06-2011, 05:43 PM   #8
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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
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Old 09-06-2011, 05:47 PM   #9
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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.
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Old 09-06-2011, 05:50 PM   #10
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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.
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Old 09-06-2011, 05:56 PM   #11
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Originally Posted by InvertChaos View Post
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

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