4.88 or 5.29

Never went that fast with mine lol.
I’ve had a great 3,000 miles so far, no issues but I don’t drive fast with the 37’s.

 

Actually 25 over according to the ticket I got last week... @CallMeD i was showing 82 when he popped me. I haven’t recalibrated yet since adding 37’s and 5.29’s. You could be going much faster than 90

 

You might actually be hitting the limiter. Isn't it like 115 or something low like that? Who knows what the computer is calculating with over sized tires and gears. I have 4.88 with 37s and I've had it up to 90, as read by GPS, with no issues, but the speedo was only showing 80 something.

I'm sure he was in Mexico when he was testing this

 

Thanks for the heads up guys. With that said, it sounds like it’s worthwhile to invest in recalibrating.

 

90mph at the speedo or corrected?

 

Based on my tires, speedo reading X 1.1464 = actual speed. I did a simple math ratio. I verified this with a ticket (hahaha) and one those radar speed limit indicator that flashes your speed.

 

@T-Rex266 can this maybe move from first gen land elsewhere? We've been infiltrated by strange behemoths.

 

Sorry brother, did not realize I landed in the 1st gen section.

 

90 at the speedo

 

If you don't have a speed correction on your speedo, you are actually going over 102 mph. Not sure how this helps, lol.

 

It definitely helps in understanding the issue. I’m looking at different options on a correction/recalibration of the speedo now. Any recommendations?

 

All good, it was overrun way earlier, no biggie. Just don't want a first gen user setting expectations based on 2nd/3rd gen feedback.

 

For speed corrections, hypertech works from what I understand . I'm not sure the speedo can be tune by HPtuners.

 

4.88s with 37s here...feels stock, shifts normal, no gear hunting on highway

 

I already stated this before. For 37's, I think 4.88 is a little too tall and 5.29 is a little to short for good performance balance with mpg. I think 5.29 was produced to cover 37's - 40's. I think 5.13 would have been ideal, at least for my need. I did get 5.29 because purely on diameter change, it needs 4.93. I will always opt for performance over mpg, it's a truck.

 

I put 4.88 on and got about a 1 mpg increase with 37s. Shifts perfect. I think 5.29 is too much for a 37, but then again, I wanted to bring mine back to stock

 

Running 5.29 on 37’s and it feels just right, but I think I’m getting heavy. Steel sliders and skids, topper, decked and bed slide, and these toyo rts are heavy too.

 

First thread response and new member. Long time listener first time caller .

I have the 5.29 nitro set and am getting 11-12 city & 13- 14 hwy. I’m running 37” tires and have custom bumper and skid plates. Power is awesome as I can burn out on turns and run it to 30mph while doing it. My goal is 15mpg. I’ll let you guys know if I get there.

 

@deedubb sorry if I missed it, but can you give me details on your install?
Tire size, gear size, install cost, install time, etc?
Are you happy with the gears and the shop?

I was referred to Colorado Axle and Gear,.going to call tomorrow but still cant decide between 4.88 and 5.29. 34" tires, supercharger.

 

I actually went with RSG instead. I am on 37” tires and did the 5.29’s. They had it for 2 days and it cost about $1800 for labor and gear oil. It feels stock again to me. Made a huge difference when towing. I’ve had zero issues in the past several thousand miles

 

Coo . What made you decide to go with RSG

 

I’ve used them before for other work

 

Awesome thanks man. They also have a better warranty it sounds like, I feel like I will probably go with them and do the 4.88 with my 34's. I was really considering 5.29, but with only 34" and the supercharger Im sure it would be too much

 

Good luck! Keep us posted

 

@831Tun Are you still feeling that the 5.29 are too much with 35's?

 

I switched to 37s not long after doing the gears. It's just my opinion, not worth much, that 4.88s are for 35s and 5.29s are for 37s. Nothing says you can't run 5.29 and 35s, some might prefer that setup

 

Well I have 34's too! So I dont know what to do. Wish I could feel both first to see. I know I could live with 4.88, but I would always be wondering what 5.29 would be like.
If I get 5.29 and I dont like it then Im stuck since I do not plan to go to 37's.
Decisions!! Decisions!!

 

Everyone gets stuck on thinking that gears = more power. They dont. They just help your truck shift better and on the hwy you'll be in a different power band