What gear ratio?

IRSmart said:

Not with a gear change, but there is with a tire change.

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Mine did change with the re-gear. Only 1 mph but it did change.

Bldrinker said:

6.4 Gas with factory 4:10’s i tow a 13,000lb Toyhauler.
Will likely go to a 295/70/18 tire.

should I go 4:88 or 5:13?

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I went with 4.56's on stock size tires. Pulls my 13,500lb. 5th wheel much better... & just drives much better! Not down shifting nearly as much as it used to. With a tire change you could really go with either of those you mentioned. If you don't do a bunch of highway driving, you probably will enjoy the 5.13's more. I have read where dozens of people wished they had gone lower & I have only read one person that was unhappy with the low gear change, & that was a person with a Jeep that has to use it as a daily driver. When I had mine done I went ahead & had a factory aluminum diff. cover installed. Might not be a bad idea with the weight you are pulling. If you go that route, just make sure you purchase a diff cover that circulates the oil properly. Many of them do not. I was going to go with the factory set up or a Banks cover. The Banks looks better but is a stupid amount of money.

IRSmart said:

Have you towed with this setup yet and are unhappy with it? 4.10 is already a pretty stout towing gear, since you’re not going up huge in tire size, and you’re well below your current max tow rating as it is, I personally don’t see the need to increase as drastically as you’re asking. But you’re the one that drives it, not me.

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The way these transmissions are geared 4.10's are NOT a stout gear. With the 2 overdrive set up they have 4.10's should be the base gear & 4.56 should be the option.

Well I got the truck leveled and slightly bigger tires put on 34” and the truck does not like it while towing the trailer between 60-65mph the transmission wants to go to 4th but can’t hold it.

so I’m definitely going to re gear. Now to decide if 4:88’s will give me better performance than my stock setup
Of 4:10’s and 275/70/18

Or should I go 5:13?

current tire is 34”

Bldrinker said:

Well I got the truck leveled and slightly bigger tires put on 34” and the truck does not like it while towing the trailer between 60-65mph the transmission wants to go to 4th but can’t hold it.

so I’m definitely going to re gear. Now to decide if 4:88’s will give me better performance than my stock setup
Of 4:10’s and 275/70/18

Or should I go 5:13?

current tire is 34”View attachment 214269

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I replied to your last post in another thread, but will say the same thing here. So you are saying that truck will NOT hold 4th gear currently, so you are usually running in 3rd? In you are in 3rd gear at 65 mph that should be around 3,700 rpm range with the 4.10s, and 4th gear at 65 mph would be around 2,600 rpm. Going to 5.13 at 65 mph would put you around 3,300 rpm in 4th gear and 4,600 rpm in 3rd.
The question would be if that going to 5.13 would allow it to pull in 4th. The RPM difference is 2,600 vs. 3,300.......or maybe another way to look at it is that 5.13s put 4th gear about 70% towards the current 3rd gear/4.10 overall ratio.

62Blazer said:

I replied to your last post in another thread, but will say the same thing here. So you are saying that truck will NOT hold 4th gear currently, so you are usually running in 3rd? In you are in 3rd gear at 65 mph that should be around 3,700 rpm range with the 4.10s, and 4th gear at 65 mph would be around 2,600 rpm. Going to 5.13 at 65 mph would put you around 3,300 rpm in 4th gear and 4,600 rpm in 3rd.
The question would be if that going to 5.13 would allow it to pull in 4th. The RPM difference is 2,600 vs. 3,300.......or maybe another way to look at it is that 5.13s put 4th gear about 70% towards the current 3rd gear/4.10 overall ratio.

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thanks that is helpful input. Correct right now unless perfect flat ground or no wind. Trucks struggles to hold 4th. But once it kicks down to 3rd I have to back out of throttle otherwise I will be doing 70.
So if 5.13 is 70% of my ration now. That is allot better. Probably way more than enough.

Man I wish I could try before I buy lol

Bldrinker said:

Bumper pull, why?

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Just wondering about details for more data points. I’m towing a 10K dry(14 GVW) fifth wheel toyhauler. It’s usually 12-13k when hitched up.
I’m 4.10s with stock sized tires towing in Utah, and don’t even spend most of the time in 4th, much less 3rd. Flat ground I’ve even towed along in 6th when I’ve occasionally forgotten to push the T/H button after a stop.


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NewBlackDak said:

Just wondering about details for more data points. I’m towing a 10K dry(14 GVW) fifth wheel toyhauler. It’s usually 12-13k when hitched up.
I’m 4.10s with stock sized tires towing in Utah, and don’t even spend most of the time in 4th, much less 3rd. Flat ground I’ve even towed along in 6th when I’ve occasionally forgotten to push the T/H button after a stop.


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I didn’t saw I spend allot of time in 3 and 4th just that if it’s an incline or windy it hunts gears. And I’m on 34’s.
When it was stick it did better. Not great.

Well I got the money all saved up still can’t make up my mind.

I’m thinking 4.88 but afraid that will barely be better than stock.

Bldrinker said:

Well I got the money all saved up still can’t make up my mind.

I’m thinking 4.88 but afraid that will barely be better than stock.

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I got a quote for 4.88s Saturday, and the guy tried to talk me out of it for stock tire size. Nobody seems to agree.


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NewBlackDak said:

I got a quote for 4.88s Saturday, and the guy tried to talk me out of it for stock tire size. Nobody seems to agree.


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Interesting. I had a guy that said anything over 4:56 would be to big with my 34”. Not sure many people realize how tall our 2 overdrive gears are.

I’m thinking I will be 2400 rpm with 5:13 and 34”

If I ever do the switch I'd go 4.56 with stock tires. If you're going up a tire size or two you could maybe go 4.88. 5.13 seems crazy to me but I'm just going off what RPMs I saw on various charts and from simulating those RPMs by driving and locking into lower gears.

Honestly, rolling along at 2500 RPMs doesn't sound/feel a lot different than 1800 in this truck. I'd say a lot depends on what you want/expect/need out of the truck while not towing. If you never or rarely cruise above 70 than go with the 5.13s. If you live in the middle of Nevada and regularly bomb along at 85 (without trailer, hopefully) I'd probably stick with 4.56 or 4.88.

I love my 4.88s and as mentioned I'm on 34" tires. My shop guy loved driving my truck after the swap. He was super impressed, but was a little leery at first because it was such a low gear.

Anyone use revolution gears I got a price for 1800 bucks installed or Yukon 2500 bucks and they want to hundred dollars for an inspection and refill

I paid like 2400 and it was Yukon gears. My inspection and refill was free at 500 mile .

Inland jeep, Rialto CA $2215 Yukon gears lifetime warranty. Includes inspection and refill after 500 miles.

Giving him deposit to order parts this week.

might not be able to get it done until I pick my trailer up from the dealer. Because I won’t have enough miles on it before towing.

Bldrinker said:

Inland jeep, Rialto CA $2215 Yukon gears lifetime warranty. Includes inspection and refill after 500 miles.

Giving him deposit to order parts this week.

might not be able to get it done until I pick my trailer up from the dealer. Because I won’t have enough miles on it before towing.

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I would get it done tomorrow if I could find that price locally. All the quotes have been $3200-3800.


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Bldrinker said:

Interesting. I had a guy that said anything over 4:56 would be to big with my 34”. Not sure many people realize how tall our 2 overdrive gears are.

I’m thinking I will be 2400 rpm with 5:13 and 34”

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Yeah the shop I went to thought 4.56 would be too low for me & stock tires. As you said, they don't realize the 2 overdrive gears we have. You get the old school guys like me remembering the old 3 speed tranny's & a 4.10 rear end was just insane! Friend of mine had a Charger with a 383 with 4.10 gears & he was running 3,000 rpm's at 60 mph. He said top end was only about 80 mph but getting there was a blast!

68PowerWagon said:

Yeah the shop I went to thought 4.56 would be too low for me & stock tires. As you said, they don't realize the 2 overdrive gears we have. You get the old school guys like me remembering the old 3 speed tranny's & a 4.10 rear end was just insane! Friend of mine had a Charger with a 383 with 4.10 gears & he was running 3,000 rpm's at 60 mph. He said top end was only about 80 mph but getting there was a blast!

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it always scares me when I go to someone to pay them for a service yet I know more about it than them.

68PowerWagon said:

Yeah the shop I went to thought 4.56 would be too low for me & stock tires. As you said, they don't realize the 2 overdrive gears we have. You get the old school guys like me remembering the old 3 speed tranny's & a 4.10 rear end was just insane! Friend of mine had a Charger with a 383 with 4.10 gears & he was running 3,000 rpm's at 60 mph. He said top end was only about 80 mph but getting there was a blast!

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I agree. Don't think a lot of these people understand gears and what the numbers mean. The difference between 4.10 and 4.56 is not much at all. You are only talking about a 200 rpm difference at 70 mph. When people ask me for my opinion on what gears to go to I always suggest going at least "two steps apart". What I mean is that in general gear choices are in the ranges of 3.55, 3.73, 4.10, 4.56, 4.88 and 3.73 to 4.10 is only 1 step apart, 4.10 to 4.56 is only 1 step apart, etc.... In my experience it's pretty hard to tell the difference between gears that are only 1 step apart. Spent years working in the automotive test field running tests on vehicles and had fleets of vehicles that were basically the same with the exception of the different factory gears that were usually always "1 step" apart. If you didn't look at the engine rpm's at certain speeds it was hard to tell them apart. Prior to that experience I daily drove a Chevy truck that came stock with 3.73's and then I added 33" tires. When the opportunity came around I regeard the axles to 4.10 (1 step). Remember how excited I was going to the shop to pick it up because of how big of a difference it would be.......I was very disappointed driving it home as I really couldn't tell any difference.