5.13 is a bit deep if you are running 80 on the hwy. 4.88 would lower rpm's by about 200, so not a huge difference. Either slow down or go 4.56, you speed demon
I have 33s right now, at 62lbs each. HEAVY for 33s. I found 35s at around the same width and same weight 61 lbs. Can I assume these tires would function the same on the same gear ratio? Or is that stupid? I want to eventually get 35s but I have stock gearing right now and want to upgrade once and be done with it, but I don’t think I can upgrade to 5.38 with 33s (even if they are heavier than 35s). I am thinking about going to 5.13s with my heavy 33s and then when I get 35s eventually just deal with them on the 5.13 ratio. I have the Rubicon 42RLE tranny
I wouldn't call it "stupid" because that's not nice but you're missing an important fact that the overall gear ratio doesn't stay the same just because you found 35's with the same width and weight as your 33's. There is another input into the calculation and the diameter of the 35's is increased compared to 33's, therefore the overall gear ratio becomes taller and you will lose engine rpm at the same speeds. In fact, most people re-gear their vehicles to compensate for the diameter of their new bigger tires, not so much the potential weight and width increases.
Ok this is just what I was looking for, thanks for the info! Appreciate it
Jerry mentioned that the 5.38 is fairly new and with the pinion being the same size as the 5.13 making the 38 doable on that carrier.I’m confused, I was told the Dana 44 carrier (Rubicon with lockers) can’t handle the 5.38 size and 5.13 was the max?. I have 33s right now, at 62lbs each. HEAVY for 33s. I found 25s at around the same width and same weight 61 lbs. Can I assume these tires would function the same on the same gear ratio? Or is that stupid? I want to eventually get 35s but I have stock gearing right now and want to upgrade once and be done with it, but I don’t think I can upgrade to 5.38 with 33s (even if they are heavier than 35s). I am thinking about going to 5.13s with my heavy 33s and then when I get 35s eventually just deal with them on the 5.13 ratio. I have the Rubicon 42RLE tranny
Yep, big difference in the final drive between the auto/od and manual.Funny, I went with 4.56 gears on a 2000 TJ 5-speed with 35's and it's perfect for me because I usually cruise at 70-75 mph on the highway. I got some grief on another forum because some self-appointed 'expert' insisted that I should've gone with 4.88 gears, but I knew that I didn't want a buzzy engine running over 2,500 rpm for long distances. I'm technically not operating at the peak of the torque curve and occasionally have to downshift to 4th on really steep hills but I was targeting highway comfort and drivability more than anything else. Once I'm off-road, especially in 4-low, I don't feel like the axle gearing matters so much and I'll eventually upgrade the transfer case from 2,7 to 4-1, which will make a much greater difference.
The gear ratios on the automatic transmission are different than the manual - top gear .69 vs .79 on my 5-speed - so I'm not surprised Jerry really likes the new 5.38 gears. While I was building up my Jeep, I briefly drove it with 35's and the stock 3.73 gears and that's just miserable.
I’m confused, I was told the Dana 44 carrier (Rubicon with lockers) can’t handle the 5.38 size and 5.13 was the max?.
I have 33s right now, at 62lbs each. HEAVY for 33s. I found 25s at around the same width and same weight 61 lbs. Can I assume these tires would function the same on the same gear ratio? Or is that stupid? I want to eventually get 35s but I have stock gearing right now and want to upgrade once and be done with it, but I don’t think I can upgrade to 5.38 with 33s (even if they are heavier than 35s). I am thinking about going to 5.13s with my heavy 33s and then when I get 35s eventually just deal with them on the 5.13 ratio. I have the Rubicon 42RLE tranny
I'd rather have 5.38's with 33's than 5.13's with 35's.
I'm pretty that even the 5.13's were not available in thick cut versions until Revolution had them developed at the same time as the 5.38's about 3 years ago. Until then, you had to change the carrier to work with the available thin or regular pattern gear sets.
I'd rather have 5.38's with 33's than 5.13's with 35's.
You have something wrong somewhere. Not sure what, but if you plug those numbers into the calculator and work backwards, it is showing you are running a 34.5" rolling radius on your tires. You should be around 2650 at that speed with 33's. You're showing what you would have with 4.88's, and 33's. Have you corrected the speedo and verified the gear set ratio?
I'm running 4.88's with 32's. No issues at all.Oh interesting ok. Even as a DD? I’m ok with the sucky MPG but will that put strain on the drivetrain until I can afford 35s?
You have something wrong somewhere. Not sure what, but if you plug those numbers into the calculator and work backwards, it is showing you are running a 34.5" rolling radius on your tires. You should be around 2650 at that speed with 33's. You're showing what you would have with 4.88's, and 33's. Have you corrected the speedo and verified the gear set ratio?