Gear ratio setting

Need some advice,

I drive a 2011 Toyota Tacoma sport 4x4 V6 and about to have ARB lockers installed but before I do I want to make sure if I have to change my gear ratio. I currently have the stock 3.73 which came with 31" tires. I now drive 32" tires. Should I take this opportunity to change the gear ratio?

According to this formula I found on YouTube the result showed to go with a higher gear ratio. Here's the formula based on tacoma specs:

32(current tire size) x 3.73(stock gear ratio) divided by 31(stock tire size) = 3.85

What's your opinion, change gear ratio or stay the same? I do notice on freeway speeds some lag on gear shifting, I'm not sure if that has anything to do with stock gear ratio with 32" tire causing the lag on shifting.

Your help is greatly appreciated

 

Regearing isn't really needed on v6s until you get up in the 34/35 inch range. I'd save or spend your money on something else for the truck and keep the stock 3.73 gearing

 

That is an interesting algorithm or whatever you call it.... lemme plug in 35s see what happen

35 x 3.73 ÷ 31 = 4.21... Seems somewhat accurate hmmmm....

As for your question generally people feel as though 285s are the upper limit before a regear. That said if you are opening up the diffs anyway to install lockers well then I think that one should consider regearing.

My 07 had 285s, stock gears and it was not a problem at all.

 

If you are already opening up the diffs and are on some larger tires 4.10 gears might be a good move. That way if you ever go bigger in the future it will help. Would hate to see you want larger tires in the future and have to pay labor AGAIN!

 

Same here. I didn't notice much difference when I went to 10ply 285s. I put 35s on and it was a dog with stock gears. I did 4.56 with lockers and would not want to go anything numerically higher. I drive a lot of high way. If you are going to 35s in the future then do it now.

 

Thank you all for answering my question, for now Im happy with my 32" Duratrac Tires. I don't do much crawling at all mostly overlanding. If I do go bigger 33" would be my max I would go

 

You'll be fine on 33s with the 3.73 gears. If you have an automatic transmission, I'd say stay with those gears (@Kyitty might suggest otherwise). If you have a manual transmission, go to 4.10 while you're in there.

 

I'd say get the 33's and see how you like it. A regear is spendy. The motor and transmission work harder the bigger the tires are because it reduces your effective gear ratio. Essentially you are forced to lower RPM at the same speeds which means more struggle at lower TQ/HP levels. This forces the motor to burn more fuel to overcome the struggle, thus reduced fuel ecomony.

4.10 is ideal for 33 on an auto to keep close to factory RPM. This helps retain as much fuel economy as possible by allowing the motor to run as close to the intended RPM as possible.

I went 4.56 gears though due to extra weight and wanting lower end torque. But that means higher RPM at speed, which means reduced fuel economy.

 

Just realized you are doing lockers. Much cheaper to regear at the same time!! Lot less labor.