time to pick gear ratio for my Gladiator i need help.

[klst123]

im getting 3.5 38s setup for my JT 3.6 automatic . n i can't choose gear ratio between 4.88 and 5.13.

no towing, no rock crawling, 90% of onroad ride. but got a heavy bumper n rockslide side step also living in Korea that have many mountains n uphill roads.

which one is could be good choice??

sry for my bad eng haha

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[crmarczak]

Are you ever going bigger than 38?

 

[steve68]

4:88

option to go 37" or 35"

 

[Wheelin98TJ]

5.13 or 5.38.

 

[Lunentucker]

4.88
The closer you stay to 4.11 the stronger the setup is.

 

[JTGuy]

With my 37s (36.5) I have the 4.88s and I think they are perfect for everything. I can even go back to 35s if I want.

 

[steve68]

With my 37s (36.5) I have the 4.88s and I think they are perfect for everything. I can even go back to 35s if I want.

I think the same thing!

 

[klst123]

Are you ever going bigger than 38?

Nah ill stay w 38s

 

[klst123]

5.13 or 5.38.

Is there a any reason for that?

 

[klst123]

With my 37s (36.5) I have the 4.88s and I think they are perfect for everything. I can even go back to 35s if I want.

No struggles to using 8th gear?

 

[3VOLVE]

Recommend taking a look at a gear calculator in order to determine the best ratio for your tire size that is acceptable for a close to stock rpm range.

https://spicerparts.com/calculators/gear-ratio-calculator

https://spicerparts.com/calculators/transmission-ratio-rpm-calculator

 

[Stormtroopin]

4.88, I’ve seen to many people in this forum say that it’s perfect for 37/38 with the auto and 3.6. However I’ve never seen anyone complain the they should’ve went 488 instead of 513.

 

[Wheelin98TJ]

Is there a any reason for that?

5.13 = 2,200-2,300 RPM at 70 mph in 8th.

5.38 = about 2,400 RPM at 70 mph in 8th.

I’d lean towards 5.13 unless you think you might go up to 39-40s someday.

 

[JTGuy]

With my 4.88s I ca actually accelerate in 8th some at 70+ mph. It acts a lot like it did with factory 33s and the 4.10s. My 37 BFG KO2s are a light tire that helps. I will never go over my 37s but if I was then 5.13s would be an option. With my 4.88s I can easily go back to 35s for better towing if needed. I think my MPG is better with the 37s and 4.88s than it was with the 4.10s and 35. Just a very little. But the around town performance of 0-40 is great, really no 392 needed.

 

[ttn333]

5.13s. I would be unhappy wtih 4.88 especially when I go uphill. I'm on 37s. Runs great on the highway too. I usually stay between 70-80mph.

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