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Adjusted gear ratios       #: 1400
 Moderated by: NoPower, Mike69, MaDMaXX
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 Posted: Thu Nov 15th, 2018 03:18 am
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Eddie Money
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I'm looking to lift my truck eventually to give it a better stance. Im currently running street tires. I dont recall the size off the top of my head. I'm too lazy to look at the moment. I have 3:73 gearing currently and wouldnt have any issues going to 4:10s in my current configuration. I like the acceleration with my current tire size and gearing. Lifting the truck would include going to a truck tire size, 33"-35". I know if I go up in tire size I'm essentially changing the gear ratio. 

Is there a SIMPLE formula to figure out what gearing ratio I'll need to keep same acceleration with larger tires?

Fuel economy is not a concern, but I want to be able to do freeway speeds and be able to accelerate beyond to pass without pulling ridiculously high rpms. If I went with a 33"-35" tire I can only guess I'd need 4:56-4:88 gearing? 

Attachment: Screenshot_20181114-195205_Gallery.jpg (Downloaded 28 times)



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 Posted: Thu Nov 15th, 2018 04:15 am
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Eddie Money
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GOOGLE!!!! LOL
Found it.

Quick cheat sheet too. 

Want to see it full screen with details go here.
https://www.ntwonline.com/gearing-for-taller-tires/



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 Posted: Thu Nov 15th, 2018 04:19 am
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Eddie Money
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Yellow=economy
Black=optimum 
Blue=towing/performance

Last edited on Thu Nov 15th, 2018 04:20 am by Eddie Money



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 Posted: Thu Nov 15th, 2018 11:59 pm
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DO NOT GO FROM 3.73 to 4.10 YOU WILL BE SAD YOU DID IT

They are too close to each other
You will pay big money for a small change
I would go 4.56 for 33's
go 4.88 for 35's

Everyone who goes 33" almost always eventually goes to a 315 (34") or a true 35", keep that in mind when you re gear

ONly reason to go 4.10 would be if you found bolt in front and rear factory axles with the 4.10 for cheap
If you are going to pay for a re gear the 3.73 to 4.10 is not worth the $$$ spent

I paid big $$$ long ago to re gear from 3.73 to 4.10 and install ARB lockers
Not worth it, barely noticed a difference when I picked up the truck
I should have done 4.56, back then they did not make 4.88 for our front diffs (reverse rotation dana 35)
I still have 4.10 and I run 35's, I make up for it by having a V8
In my wifes Fj, also on 35's, we went 4.56
Her truck scoots compared to mine, she has better torque all over the powerband
The only thing I do have is a nice highway gear, 65mph is like 2250 rpm = good MPG
But I would MUCH rather have 4.56 with my automatic and V8
If I was to go to a 5 speed manual (I am considering a M5od-R2 conversion) I would re gear to 4.88. With a 5 speed I would have more control over what gear I am in so you can get away with a steeper ratio in the diffs.....

Last edited on Fri Nov 16th, 2018 12:04 am by 410customs



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 Posted: Fri Nov 16th, 2018 12:46 am
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Eddie Money
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Lol. Yeah i meant with the truck as it is now I could run 4:10 gearing and still enjoy driving it. But with taller tires 4:56!!! Totally agree. It looks like the 4:88 might put me in too high of an rpm, but like you said, with a V8/SC and overdrive .....might be the ticket. I'm compiling knowledge so I have a better idea what I want when it rolls into your shop

Last edited on Fri Nov 16th, 2018 04:09 am by Eddie Money



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 Posted: Mon Nov 19th, 2018 12:29 am
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question posed on this subject that had good info based upon almost exact variables...



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