Re-gear from 3.73 to 5.13

[NC_Overland]

The question of gearing depends a lot on your environment and if you're running a Dana 44 axle; if you're in an environment that's slippery, muddy, or has loose soil then there's no real problem with the 5.13 gears and a Dana 44. If you are in Moab or other environments with very high traction and potential driveline binding, 5.13 gears become a problem. The small pinion gear means less engagement with the ring gear and tends to result in broken teeth and sheering. I've seen more than a few diffs grenade on the slickrock, but 4.88 gears have a larger pinion and more surface area engaged with the ring gear.

If you go with a Dana 60, all this above is meaningless since you can get 5+ gearing ratios out of a larger ring gear and keep a larger pinion for more engagement.

I’m glad someone else brought that up. The small pinion with the 5.13s concerns me too. I’d never go past 4.88. I didn’t mention it because it’s such a powder keg.

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[VA6489]

being inexperienced with this gearing change kinda sucks. so much to read online and i’ve read great things about both gearing choices. my biggest concern was wanting the truck to feel stock again. on highway rides 6th gear is the highest the truck will get in auto. i’ve read 4.88 still not that “stock” feel with 37s

Make sure you reprogram the ECU for the larger tires

 

[bleda2002]

You'll love them. The margin between 4.88 and 5.13 pinion is so small that if you were breaking one you'd be breaking the other, it's less than 5% on advantek axles. Usally breaking your pinion is mostly a right foot problem, don't bounce the jeep while flooring it and you'll be fine.

Ton of people running 5.13s on this forum and jl forum and broken rings and pinions are not a common issue we have.

 

[Sweetums]

You'll love them. The margin between 4.88 and 5.13 pinion is so small that if you were breaking one you'd be breaking the other, it's less than 5% on advantek axles. Usally breaking your pinion is mostly a right foot problem, don't bounce the jeep while flooring it and you'll be fine.

Ton of people running 5.13s on this forum and jl forum and broken rings and pinions are not a common issue we have.

As I said, it's all about use case. In Moab, where I do almost all my wheeling, broken 5.13s in a Dana 44 are pretty common, but almost never with 4.88s. I'd happily and reliably run 5.13s if I wheeled in the Appalachian mountains, or even the Pacific Northwest's loamy soil, but on the very grippy sandstone and desert rocks here in Utah they are consistently a problem with a Dana 44.

 

[bleda2002]

As I said, it's all about use case. In Moab, where I do almost all my wheeling, broken 5.13s in a Dana 44 are pretty common, but almost never with 4.88s. I'd happily and reliably run 5.13s if I wheeled in the Appalachian mountains, or even the Pacific Northwest's loamy soil, but on the very grippy sandstone and desert rocks here in Utah they are consistently a problem with a Dana 44.

A Dana 44 is not a Dana 44. The old school dana 44 vs a jk dana 44 (and pro-rock/currie) vs an advantek dana 44 are all different ring and pinion sizes. The advantek dana 44 has a much larger pinion than the jk gear sets and the pinion for 4.88 and 5.13 has the same amount of teeth just the number of teeth on the ring change and the pinion gets a little smaller but the contact area does not decrease as dramatically as it does in previous gens.

If they're using advantek axles, then its the driver's. If they're breaking 5.13's they're breaking 4.88's too. Most likely if you have no issues with 4.88's you'd be fine on 5.13's as well.

Here is an advantek 4.88 vs a 5.13 both are 8 tooth pinions (even the 5.38 is an 8 tooth shockingly).

 

[Wheelin98TJ]

The question of gearing depends a lot on your environment and if you're running a Dana 44 axle; if you're in an environment that's slippery, muddy, or has loose soil then there's no real problem with the 5.13 gears and a Dana 44. If you are in Moab or other environments with very high traction and potential driveline binding, 5.13 gears become a problem. The small pinion gear means less engagement with the ring gear and tends to result in broken teeth and sheering. I've seen more than a few diffs grenade on the slickrock, but 4.88 gears have a larger pinion and more surface area engaged with the ring gear.

If you go with a Dana 60, all this above is meaningless since you can get 5+ gearing ratios out of a larger ring gear and keep a larger pinion for more engagement.

This is why I’ll stick with 4.88. No Likey grenades under the Jeep.

I’m glad someone else brought that up. The small pinion with the 5.13s concerns me too. I’d never go past 4.88. I didn’t mention it because it’s such a powder keg.

Dana says there is no strength difference between different ratios.

 

[FLY-DOG]

Yeah, the deep first gear helps a lot. I can lay pretty solid 11s on 3.73s and 34s and some people say you can’t do that.

Lay pretty solid 11's........when does that even mean in plain English.

 

[Wheelin98TJ]

Lay pretty solid 11's........when does that even mean in plain English.

11 second quarter miles.

 

[Sweetums]

Lay pretty solid 11's........when does that even mean in plain English.

Spinning both rear tires and leaving burnout marks - which is unlikely in RWD without a limited slip or engaging the rear locker. More than likely it's a 1-wheel-peel, the ol' peg-leg burnout.

 

[FLY-DOG]

A Dana 44 is not a Dana 44. The old school dana 44 vs a jk dana 44 (and pro-rock/currie) vs an advantek dana 44 are all different ring and pinion sizes. The advantek dana 44 has a much larger pinion than the jk gear sets and the pinion for 4.88 and 5.13 has the same amount of teeth just the number of teeth on the ring change and the pinion gets a little smaller but the contact area does not decrease as dramatically as it does in previous gens.

If they're using advantek axles, then its the driver's. If they're breaking 5.13's they're breaking 4.88's too. Most likely if you have no issues with 4.88's you'd be fine on 5.13's as well.

Here is an advantek 4.88 vs a 5.13 both are 8 tooth pinions (even the 5.38 is an 8 tooth shockingly).

I noticed the gears are a different rotation? Maybe just a reverse image on one?

 

[bleda2002]

I noticed the gears are a different rotation? Maybe just a reverse image on one?

Most likely they're from the Dana Spicer website

 

[FLY-DOG]

Lay pretty solid 11's........when does that even mean in plain English.

Yeah right, somebody smoking weed.....My 392 Wrangler with 5.38 gearing won't run 11's so a stock 3.73 gear 3.6 V6 on 34's.......might run 18's.

 

[NC_Overland]

Lay pretty solid 11's........when does that even mean in plain English.

You’ve never heard of 11s? I bet this guy would rather have the gallo 24. AMIRITE!?!?

 

[NC_Overland]

Yeah right, somebody smoking weed.....My 392 Wrangler with 5.38 gearing won't ruin 11's so you stock 3.73 gear 3.6 V6 on 34's.......might run 18's.

Peg leg over here.

 

[NC_Overland]

Spinning both rear tires and leaving burnout marks - which is unlikely in RWD without a limited slip or engaging the rear locker. More than likely it's a 1-wheel-peel, the ol' peg-leg burnout.

Trash loc. Just turn traction control off and power brake it for a few seconds and it will stay in first gear about 5k and spin till you let off. My tires are like $350 a piece so I don’t do it very often. The last time was actually before I got new tires.

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