Manual Transmission and Regearing

Hi All,

I'm in the process of building out my '17 Tacoma TRD PRO with a manual transmission as part of an overloading build which equals a big weight gain. I'm curious to get your opinion of the pros/cons of regearing the transmission. Can't I just shift earlier and avoid the cost of rebuilding the transmission? Am I missing something?

 

I am not sure why you would want to regear the transmission and have a one of a kind transmission .

I can only venture having new gears designed and cut and installed would be very expensive.

Did you word things wrong and mean to discuss regearing the differentials which is quite common when going to larger tires .

 

You MIGHT consider re-gearing the diff's to lower gears, but I've never heard of anyone changing the gearing in the transmission. Is that even possible? And if it is, is it economically feasible?

 

Thanks Bivouac,

Please forgive my ignorance! I am still learning here. So I gather now when people say “regearing” they are referring to the differentials not the transmission. Color me embarrassed. But my point still stands - should this be done with manual transmissions?

 

Clearly he means the diffs but isn't knowledgeable enough to know the difference yet. Give him a break.

Regearing has benefits when you start adding bigger tires and lots of weight. Try looking at this thread or some others where guys talk about why they've regeared. https://www.tacomaworld.com/threads/the-5-29-mega-thread.557305/

 

We all can learn things on here.

I can only say try it see if you are comfortable with how it drives .

Put simple larger tires change your gear ratio regearing changes the gear ratio back closer to stock.

If your not then you can regear at a later time.

It all comes down to the use of the vehicle and what your end game is

Hard core off road double Transfer cases are even an option

 

Yes you could have a custom transmission built I can only guess $5000.00 depending just what end result you wanted maybe double that.

One major downside if it broke your sitting weeks for parts and one needs to send it back to who built it for repair.

 

I read the op's question a lil differently.

I see a lot of threads/comments about regearing, but almost always referring to an automatic transmission.
But are there reasons to regear differently if you have a manual transmission?

Seems like Toyota used different stock gear ratios for auto vs manual.
https://www.tacomaworld.com/threads/stock-gear-ratio-question.373987/

For example, if you were to regear an automatic to 5.29, would you regear to 4.88/4.56 instead because it is a manual?
Or maybe the other way- 5.29 for manual where 4.88 would be correct in an automatic- seeing as stock manual 4.10 > 3.73 stock automatic
Or is that crazy-talk?

As OP implied, because the driver controls the gear shift timing, is the need for lower gearing as acute?
I.e. can shifting later/higher rpm compensate for a not having a lower gear ratio.

Obviously in 4lo, lower gears will help increase torque. But what about in 2hi where max torque not called for?
Does 1st gear (in 2hi) just bog with big tires?


There, water muddy enough yet?

And I didn't even touch '5spd vs 6spd'

 

Yep. You got it. I’m a NOOB and should have said DIF, DOH!

 

I learn new things all the time it keeps my brain working.

 

What are wanting to accomplish and are staying stock tires or oversized and if so what size?

 

Yep, you will still need to regear a manual if you’re adding bigger tires and more weight, hence his overland build. That’s the point of a transmission, to use your full range of gears. Im not going to throw 35’s on and then not use my 6th gear because my gearing is too tall now. I would want that whole range.

Maybe I read the OP’s post a little different

 

If you’re planning an overlanding build that’s going to add bigger tires and substantial weight, yes, plan and budget to re-gear!! Although I’m a 2nd Gen (ie. best Gen), I can’t imagine driving around my 6900ish pound rig with stock gearing. I’m slightly overgeared with 4.56 (6mt) but considering the weight and other mods, I wouldn’t want to go higher (ie. 4.30 or 4.10 gears). FYI I’m not sure what the diff gearing is on the 3rd Gen 6mt is.

Edit- reading post 8, it appears your truck will have 4.10 gears. If that’s the case look at 4.56 and 4.88 gears to see what will work best for your plans.

Pic below for reference.

 

nice truck, what was your stock gearing?

also what is your tire size and rpm’s doing 65mph?

 

Thanks....stock gearing was 3.73.
Tires are 255/85R16 and I believe rpm at 65mph is ~2660-2680.