Gearing and axle question

[Mikecal9985]

Ok guys bare with me here. I'm pretty new to this whole jeep thing. I've owned my jeep for a couple years now and I'm still learning a lot. These may be dumb questions to some but I have no idea haha...

1) how do you know if you have a Dana 30 or Dana 44?

2) how can you tell what gears are being used?

3) what's a good gear set up for 35's?

Thanks for all the help guys.

 

[zip04]

1.

2. Jack the Jeep up, take the E-brake off and put it in neutral, as you spin the tire, count the revolutions of the drivetrain. Depending on the Jeep it will either be one or two complete turns of the wheel, but you will see the drivetrain spin the number of times that is equal to your gearing (I.e. slightly over 4 spins would be 4:11s)

3. Depends on your engine, transmission, etc. but 4:88 would likely be a good ratio to go with.

 

[Mikecal9985]

1. View attachment 194253

2. Jack the Jeep up, take the E-brake off and put it in neutral, as you spin the tire, count the revolutions of the drivetrain. Depending on the Jeep it will either be one or two complete turns of the wheel, but you will see the drivetrain spin the number of times that is equal to your gearing (I.e. slightly over 4 spins would be 4:11s)

3. Depends on your engine, transmission, etc. but 4:88 would likely be a good ratio to go with.

Wow thank you for all this info. I have a 2011 2 door automatic and I believe a 3.6

 

[OverlanderJK]

Wow thank you for all this info. I have a 2011 2 door automatic and I believe a 3.6

You have a 3.8 if it's a 2011.

You have D44's if you have a rubicon

You have a D30F/D44R if you have a sport.

 

[WJCO]

Use this link if you want to find more out about your build:

http://www.jeep.com/webselfservice/...ountry=us&emailUrl=goToEmailForm%28%27R%27%29

Then click on the link on the left where it says 'Equipment Listing.' Then when the page refreshes, enter your VIN in the middle and click the button. It should tell you your axle type but won't give you your gear ratio. If you don't have a Rubicon, you most likely have a 30 up front and a 44 in the rear.

 

[Mikecal9985]

You have a 3.8 if it's a 2011.

You have D44's if you have a rubicon

You have a D30F/D44R if you have a sport.

Thanks Overlander, I did mean to say 3.8, but for some reason typed 3.6. And it is a sport so that answers my axle question.

 

[Mikecal9985]

Use this link if you want to find more out about your build:

http://www.jeep.com/webselfservice/...ountry=us&emailUrl=goToEmailForm%28%27R%27%29

Then click on the link on the left where it says 'Equipment Listing.' Then when the page refreshes, enter your VIN in the middle and click the button. It should tell you your axle type but won't give you your gear ratio. If you don't have a Rubicon, you most likely have a 30 up front and a 44 in the rear.

WJCO, thanks for the link, I'll have to take a look at it

 

[DWiggles]

WJCO, thanks for the link, I'll have to take a look at it

2011 sport = D30 front, D44 Rear, 3.8l

you want to run 35s, You going to want 4.88 Max for the D30 pinion, but 5.13 for the power; either save money for a 44, and swap to 5.13 at the same time, run 4.88 and deal with it, or RISK the 5.13 Pinion on your D30.

 

[nknacd]

you could also email Chrysler and ask for your vehicles build sheet. it will give you a lot of info about your jeep. they will need the vin.

http://www.jeep.com/webselfservice/jeep/EmailPage.html

I believe that is where i submitted for my info.

 

[swampdog]

You don't have to email, you can look it up by your VIN on the website

 

[Lmoye22]

I'm running 35's on 5.13's. Had the stock gearing on my 09 till about a month ago. Huge difference! Glad I went with the 5.13s , many people said it was a bit much but not really. But with that vin lookup you can find what your jeep has. Mine was 44HD on the rear and 30 on the front. Needed a new carrier for the front.