3.73 or 4.10 gears?

[68lemans462]

I have a 2002 TJ with a 4.0, 5 speed manual, 2" lift, and 3.07 gears and 265/70/16 tires (30.5"). This is mostly a street vehicle and I probably wont go any bigger with the tires I think these look right.

I have obtained a 3.73 front axle and a dana 44 with tracloc. The rear axle needs new gears and the front is good as-is. My options are to gear the dana 44 with 3.73's, or regear both to 4.10. Are the 4.10's necessary for this application?

 

[Wildman]

If you were going to regear both axles I'd think about 4.56 even with only 32" tires. But that is me and I liked to be geared low.
4.10's minimum but like I said I'd really think about 4.56 instead.

https://www.grimmjeeper.com/gears.html Put your gear ratios into this and see what your RPM's will be. You might be surprised. And measure your tire from the ground to the center of your wheel to get an actual tire size for the calculations.

 

[DirtDawg]

I factory ordered my 1st 2000 TJ Sport NV3550 5-spd in Summer of 1999 with 15x8 Canyon wheels and 3.73 Dana 30/Dana 44 package (same Stone White!). That was OK with OEM tire size and marginally OK with 31" BFGs soon after fitted. When I started down the mods path, installed 4.56 gears and ARB lockers for 33" tires plus a TeraLow 4:1 kit (too much suspension/chassis stuff to list). So then, agreed on going a bit higher numerically so as to do it only once...

 

[DavidBT]

The one thing I read was probably. I think as mentioned, 4.10's or 4.56's I personaly would go with 4.56 gears.

 

[jjvw]

I have a 2002 TJ with a 4.0, 5 speed manual, 2" lift, and 3.07 gears and 265/70/16 tires (30.5"). This is mostly a street vehicle and I probably wont go any bigger with the tires I think these look right.

I have obtained a 3.73 front axle and a dana 44 with tracloc. The rear axle needs new gears and the front is good as-is. My options are to gear the dana 44 with 3.73's, or regear both to 4.10. Are the 4.10's necessary for this application?

View attachment 634617

You want 4.56. So given the two choices, 3.73 is the incorrect gear to keep.

NV3550/30"/4.56=2988rpm @ 75mph

 

[ledmircyy]

Between the two, I'd go with 4.10's

3.73 isn’t bad, but 4.10 just feels more right with the 5 speed

 

[machoheadgames]

I’m definitely choosing 4.10 out of those two, but if I had the option for any ratio, it would be 4.56.

I ran 31’s and 4.10s for a while with an AX15, and while it was very good compared to stock (3.55 on mine), it could have been a bit better. Now I’m running 4.10s on 28’s and it’s awesome. So, the equivalent of matching that would be 4.56 with 31’s.

 

[68lemans462]

ok, you have talked me into a 4.10 and piqued my interest in a 4.56... Decisions, decisions...

 

[jjvw]

ok, you have talked me into a 4.10 and piqued my interest in a 4.56... Decisions, decisions...

4.56 will make driving anywhere in Colorado nicer

 

[dragoncrx]

From my understanding 3.73 is the breakover for the Dana 44 carrier. If so to go to 4.10's or 4.56 you will need a new carrier.

 

[bbaldwin237]

From my understanding 3.73 is the breakover for the Dana 44 carrier. If so to go to 4.10's or 4.56 you will need a new carrier.

You can just get thick cut gears and not replace the carrier

 

[GPK03X]

My 03,4.0,5 speed has 32’s with 4.56 gears. I wouldn’t want any less as it’s great on the highway.

 

[MikekiM]

I daily drive mine and went from 3.73's to 4.56's.
Zero complaints.

I do have 33's so you'll have a little room to grow if needed.

 

[lBasket]

Why not 5.13s?

 

[OldBuzzard]

Why not 5.13s?

5.13 is a little much for the OP's manual tranny.

 

[lBasket]

5.13 is a little much for the OP's manual tranny.

Boring

 

[68lemans462]

From my understanding 3.73 is the breakover for the Dana 44 carrier. If so to go to 4.10's or 4.56 you will need a new carrier.

I pulled the trigger on the 4.10's today. With this swap I'll be adding a LSD to the rear. Is it worth it to put a lunchbox locker up front or just leave it open?

 

[MikekiM]

I contemplated 4.88's for about a day. If I thought 35's were in my future I would have gone that route.

4.10's would been a mistake with 33's.

I did TrueTrac LSD front and rear.

 

[GoldenGorilla]

I pulled the trigger on the 4.10's today. With this swap I'll be adding a LSD to the rear. Is it worth it to put a lunchbox locker up front or just leave it open?

Based on how you want to use it, I would not do a locker in the front.

 

[97TJNM]

If you're dailying on the street, I wouldn't do a lunchbox in the front. I have a 2004 Grand Cherokee with a lunchbox in the rear, and it is awesome, but if you punch it in a turn, it just wants to push you forward. Learning to drive with a lunchbox locker isn't hard, but it does require some getting used to, and I have heard that a lunchbox in the front can make it squirrely on ice. So if you get decent snow and use this on the road a lot, I'd either leave the front open or consider a selectable locker for the front.

On my Grand Cherokee, I opted to leave the front open, because I dont want to deal with the on road driving compromise, and I dont want to spend the money on a vehicle that only sees mild offroad use. If I eventually regear it though, I'll go with a selectable locker at that point.