Gearing with 35's

Gear ratio with 35's (possibly future 37's)


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JerseyMike

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I have a JT Sport S 8 speed auto with stock 3.73 gearing. I am currently running light 35's (315/70/17 BFG TA KO2s) and it drives ok but I want to re-gear. My dilemma is choosing what ratio (I am between 4.56 and 4.88). I may go with 37s down the road (likely BFG TAKO2 37x12.5x17 which are also very light weight) and I am having trouble deciding which ratio is best.

the JT370 AEV with the same 37" tires runs 4.56 and I think 4.56 would be better for 35's so I am leaning that way but also considering 4.88





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Jeeperjamie

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4.10 on my Max tow seems to be perfect with BFG KO2S in size 315 70 17. So good I'll be bumping up to 37 12.5 17 in the same brand when these wear out. 18.5-19 mpgs average and right at 20 on some long trips. If I can stay above 17 mpgs on 37s I'll be happy.
 

KurtP

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4.88 minimum.
 

Mac

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Based on such different perceptions of how the JT performs with larger tires I would say it almost like picking a color, it is up to you, not something you can use others perception for. I have 4.10s and 34” tires, IMO it is borderline for towing and very noticeable difference from the stock 32” tires empty.
 

bgenlvtex

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Didn't vote, you need to decide what size tires you're going to put on.

Assuming light/moderate trail and rural/urban mix:
If 35 then 4.56
If 37 then 4.88
 
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JerseyMike

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  • Thread starter
  • Thread Starter
  • #6
Didn't vote, you need to decide what size tires you're going to put on.

Assuming light/moderate trail and rural/urban mix:
If 35 then 4.56
If 37 then 4.88

that is right, mostly rural driving and some highways, light trail and beach driving. currently on 35s and will likely stick with them but might switch over to 37s in future.
If I had the MT I would go 4.88 for sure but with auto I am on the fence
 

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