Gear ratio for Manual and 37s

[21Moja]

I know there are a ton of threads about this but I see many talking about regearing for automatics and not much talk about the manual...I am running 37s right now, about to go under the knife for some Yukon gears. I am deciding between 4.88 and 5.13, have no plans to go bigger than 37 but my dilemma has more to do with final drive ratios on the manual and whether the 5.13 would make 6th gear more usable. I have heard many talk about the manual being a 4-speed with 2 overdrives, I want to make all 6 gears a bit more usable. Without getting into a giant debate on whos is bigger I'm hoping to get some real-world opinions on 4.88 and 5.13 in a manual...

I dont tow much if ever, never know...

I go to Wyoming and Montana often for fly fishing trips...

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[NachoRuby]

@Bbannongmu

 

[Bbannongmu]

I know there are a ton of threads about this but I see many talking about regearing for automatics and not much talk about the manual...I am running 37s right now, about to go under the knife for some Yukon gears. I am deciding between 4.88 and 5.13, have no plans to go bigger than 37 but my dilemma has more to do with final drive ratios on the manual and whether the 5.13 would make 6th gear more usable. I have heard many talk about the manual being a 4-speed with 2 overdrives, I want to make all 6 gears a bit more usable. Without getting into a giant debate on whos is bigger I'm hoping to get some real-world opinions on 4.88 and 5.13 in a manual...

I dont tow much if ever, never know...

I go to Wyoming and Montana often for fly fishing trips...

I am on my way back to Pennsylvania from Yellowstone- Wyoming, Montana and Idaho. I did 5.13 gears and I am sooo glad I did. I was able to use 3rd gear in the 10 % grades of Teton Pass. The 3.6 wheezed some but the gearing made it possible. I had to use 5th gear a lot (and sometimes 4th) on I90, I94 and the hills of US 191 to maintain speed.
Pm me if you have questions

 

[AustinL911]

No real world experience (yet), but I've researched the shit out of this.
Overall consensus for the MT seems to be:
35s > 4.88
37s > 5.13

The factory 4.10s are borderline undergeared on the JTR/MaxToes and the 3.73s on everything else is for sure undergeared. Factor in extra rotational mass of a larger tire plus getting it into a more usable range than the factory gearing provides, even in stock configuration, and I think you'd be better off going up a few notches on gearing.

If I was towing a ton with the MT, I'd go 5.13 with 35s and 5.38 with 37s. I don't think anyone has done that yet though because of the severely limited tow rating on the MTs.

 

[willhonkforparts]

5.13. The mechanical advantage is greater than the slight loss of fuel economy at high speeds in 6th. If you run a large 37 (as opposed to a Ko2 which runs small) or if you think you might ever go to 40s, I might even consider 5.38s

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