David_315

Sorry i am new here 1st post. I tried to Google this for the lat 2hrs still not finding any thing at all. But my truck is a 93 4x4 5 speed 3.0 v6. But my gear code is g284/r150F I want to know what gears my truck has. every thing i looked up said 4.30s. I want to put 31 inch tires on my truck. the tires i have on there now are 235/75/15 tires are old. I just want to know what tires came on my truck stock. if it was 31s or 225/75/15. Thanks.

Teuf

Just put 31's on there. It will be fine........

MudHippy

If it came with alloy(not steel) wheels, then it had 31x10.5s on them. If it came with steel wheels, then it could have had either 225/75's or 31x10.5's on them.

And yes, 4.30's.

David_315

I thought that trucks with 31 10.5 15 came with 4.56 stock.

David_315

Why would it come with 4.30s and not 4.10s

MudHippy

That's supposed to be the case, for 5 speed manual transmission equipped models(autos came with 4.88). But your axle code tells a different story. Which doesn't necessarily mean it's correct. Though in most cases it is.
Because no 4x4 V6 trucks came with 4.10s in 93.

Stetson_md

Most people have 100hp 4:10s and 31s
You have more power lower gears and want run the same size tire... you'll be fine

David_315

Thanks guys. for all the help.

RSR

Great resource: http://www.brian894x4.com/Gearratiosanddiffs.html

Josh_Br

You should be able to put 31's on your truck without having to alter gearing. It won't affect it very much. I have 31's on mine, a 4 cyl, and did not re-gear. It drives fine.

RSR

All the resources you need -- pulled from my previous posts on YT (figured it's helpful to have in one place...):

For our trucks (and I think his tire size/gearing ratios recommendations are spot on): http://www.brian894x4.com/Gearratiosanddiffs.html

And you can customize this one to your truck and make sure you're generating power where you need it to based upon tire size, gearing, engine, and your respective transmission (can change all of those variables too to see how it plays together): http://www.grimmjeeper.com/gears.html

The research on gearing and MPGs -- basically, below 60 mph, it's driving habits not gearing that affect MPGs and the affect above 60mph is basically a 3/4 (0.75) mile per gallon increase for each 1x multiple (so going from a 3.5 to 4.5 gear ratio you increase your 60+ mpg by less than 1 mpg at the cost of a significant loss of power up to 60mph -- roughly a 30% decrease in torque/power for a less than 5% increase in highway MPGs exclusive to gearing changes [power above 60mph is a function of horsepower, not torque and not gearing]):
http://www.propickupmag.com/understanding-axle-ratios/

Also since we're talking about differentials, a synthetic gear oil with higher cold viscosity (just one of our many recommendations that would surely improve your MPG -- and performance -- would probably make as big or bigger difference in MPGs than going with a lower gearing). Amsoil is either the best or near the best in options btw (I think our trucks call for 80w in one and 75w in the other diff, but it's the second number you need to be concerned w/ and they're both 90, so Amsoil's 75w90 Severe Gear is the way to go -- I also recommend going w/ stronger power magnetic drain plugs while you're in there, I have Gold Plugs):
http://www.lastgreatroadtrip.com/wp-...comparison.pdf

This is a great resource too talking about the relationship of drag and speed: http://www.trucktestdigest.com/axle%20ratios.htm
Also with gearing, one thing you need to remember that when you change tire size from stock, your effective gearing changes as well. For instance, the stock tires on our pickups are 225x75r15 (28.29" diameter). I have the 31x10.5r15 (30.98" diameter) tire package included swapping diffs to factory 4.88 gears. But nothing else changed in tranny, etc, except for those diffs, so my effective gearing did change as well. When calculated off of new tire size w/ 4.88s, my new effective gearing is 4.46 to 1 (an ~10% change). W/ 31" tires, to have 4.88 effective gearing, I'd need to have a 5.34 gear ratio... Going from 31" tires w/ 4.88 diffs to stock 225x75r15 tires would make my effective ratio 5.35 to 1... Etc

I like this tire size comparison tool: http://www.tacomaworld.com/forum/tir...r15-31-10.5r15
*It also has speedometer, revolution, and other differences...

And this is a good effective gear calculator that tells you what new gearing you need when changing tire sizes to keep your factory gearing ratios as well as high gearing and low gearing recommendations too : http://www.4lo.com/calc/geartire.php