2001 Taco on 37's (eventually), a re-gearing fork in the road

Hello Tacoma World, As of the past couple days, re-gearing has been on the brain and I cant seem to find a solid answer or solution to my situation as it is a little more specific than some.

I own a 2001 4x4 sr5 manual taco which will soon see the holy light of long travel suspension all around, while I sort out all the grueling tasks of making that long travel work accordingly. One task on that list is to figure out what gearing I am to run on 37" tires that will be equipped

My axle code is B03A, meaning I've got 4.10 gears and am running 265/75 R16 tires. This is a really fun combo, plenty of pep and good enough RPM range on my short highway stints. @70 mph I sit almost exactly at 2600 RPM which isn't terrible, it's what I'm used to so if it IS terrible, someone please correct me. With a re-gear I would like the same RPM range or even just a little lower on the highway.

Introducing my choices: 4.56, or 4.88 gears. I'm no genius and certainly no math whiz but I've used a formula someone on the second gen Tacoma forum has posted:

(Current gear ratio) x (New tire size) ÷ (Old tire size) = New ration (or similar gear ratio to what you were running before larger tires)

With this equation I yielded 4.8935, which would basically be 4.88 gears. I am ready to run with this answer and pull the trigger on buying a 4.88 re-gear kit for my taco, but before that, Has anyone got anything to say? Haven't seen much talk about 4.88 on 37's with manual trans. And if there are individuals who run that out there, have you got any advice on if its the way to go? any brand recommendations?

Thank you all, keep on truckin'!

 

5.29 will be a happier ratio for 35s or 37s

 

Aren’t 5.29’s even on 37’s gonna be a bit too much for street driving? Also would that make what RPM I sit at on highway much higher?

 

Hauling around the extra weight and rotating inertia of giant 37s plus all the extra shit you’re going to put on a full long travel build to actually hold the 37s onto the truck makes me think 5.29s and accepting the extra RPM would be better. You’re talking about going from ~2600 to ~2800rpm at freeway speeds. NBD, or just slow down to 65 instead of it bothers you

 

https://www.summitracing.com/newsandevents/calcsandtools/gear-ratio-calculator

I'd play around with this calculator to see what RPM you'll be at at 70 mph, with each of the gear ratios your considering.

 

I run 5.29’s with 35’s and a manual/v6. Nice and torquey around town and especially on the trails, the highway rpm’s are a bit on the high side for me personally (3k at 70). They would sit great with 37’s, and would still keep it in the power band.

 

You'll want 5.29. Lots of rotating mass and rolling resistance plus the added weight and reducing the aerodynamics you'll want 5.29s for the torque.

 

I have 4.88 and a lot of weight. I run 33's and wish I went 5.29. Tires isn't the only factor you should consider.

With 33's and 4.88 I'm in 3000rpm at 70mph.
If you're never going to run steel bumpers or any kind of armor, or a winch, you could get away with 4.56.

 

I'm 2000 V6 manual transmission,running 5.29 and 35" tires at the moment. I was planning to go to 37". Might still do it we will see.

My truck runs good with a 6" lift 35" tires and 5.29. I can spin the shit out of the rear tires in first just using the skini pedal. I'm not sure what my rpm at 70 are because I have not fixed the speedo yet. I was able to get a rough estimate on mpg and I'm getting about 12-13 around town.

I agree with others who have already stated 5.29 for 35" or larger tires.