Cost to re-gear to 4.56?

[fattire]

I'm just going to patiently wait for someone to make 4.10 gears that will fit in the SR5 rear diff and install them along with an air locker. Sometime next decade at the current rate of saving.

A 4.10 would probably be ideal for a 33" tire. Doesn't seem like there's enough demand for anyone to make them for the 8.2 carrier though.

 

[Sifrk]

Speedo is on the money. The T4R measures it at the wheel not the diff. Gearing doesn't impact it but tire size will. The 285/70/17s are still accurate as measured by GPS. General consensus on the forum seems to be that the speedo is a little under from the factory. That's the only explanation for the accuracy with a larger tire.

I was curious about the comment above regarding the factory speedo being "a little under". I was looking for information as my TRDP speedo was off and reporting a higher speed than my phone's GPS app was showing ... about 2MPH for me. I just recently went to 275s and now the speedo is very close to dead on with the GPS (and those electronic speed signs). Sounds like that's been your experience also.

 

[Alaska_4Runner]

Considering Re-gearing

Good to see another early 5th GEN on here.

Im reaching out to ask why the 4.56 vs 4.88? I'm running 285/70/17 TOYO Open Country AT II's and recently saw a decline in mileage and the ponies. Considering the re-gearing option and have thought about the 4.88 route but interested to hear the 4.56 route.

I drive mostly highway and city miles, with the occasional forest road trip about once a month. Thank you for your time, interested to hear what you have to say and your experience with the 4.56.

That's a really really good price. I went the ECGS route. 4.56s. ARB front and rear plus the twin compressor. I did all the work myself and was close to that if you include all the miscellaneous parts, multiple gear oil changes, etc.

 

[fattire]

Good to see another early 5th GEN on here.



Im reaching out to ask why the 4.56 vs 4.88? I'm running 285/70/17 TOYO Open Country AT II's and recently saw a decline in mileage and the ponies. Considering the re-gearing option and have thought about the 4.88 route but interested to hear the 4.56 route.



I drive mostly highway and city miles, with the occasional forest road trip about once a month. Thank you for your time, interested to hear what you have to say and your experience with the 4.56.

Everything is a balancing act, and you want the choices you make in the upgrades you choose to work well together. A 4.88 gear ratio is just way too much for the upgrades that even 99% of the people on THIS site install, much less the all the soccer moms out there.

When I was on 285/70/17s (essentially a large 32” tire), the 4.56s felt like a little too much. Good in the city, but pretty high RPMs on the highway. When I recently went to 285/75/17 (a true 34”), things got *much* better. Power was smoother, mileage went up a little due to lower RPMs. It’s just a better fit. I suspect that 35s would be even better and feel about back to factory.

Off road the 4.56s are awesome. Much easier to modulate the throttle on obstacles. Speed control downhill is automatic (4L, 1st gear and just don’t touch the gas). I haven’t been out with my taller tires yet, but I can’t wait. It’s mainly rock crawling down here and things get pretty serious so it’s different from fire roads.
[MENTION=106176]wfo9[/MENTION] (If he’s still around, I’m not on here much anymore; stupid work) has/had different tires than me but the same size. He’ll tell you the same thing. 4.88s are just meant for MUCH bigger tires than we can easily fit on the 5th Gen. I’d consider 35s the bare minimum for 4.88. I know, seems like a small difference from 4.56 to 4.88, but it isn’t.

My only regret is waiting so long to get the taller tires.


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