YotaCurly

Guys I've wrote on here a few times about this and I'm serious now I'm going to regear my truck I'm tired of 12 miles to the gallon I have a Toyota pickup 3vze automatic with 33's I love my tires but am sick of 12 Mpg I need serious and experienced opinion only that have done this on an automatic no I don't wanna convert to stick that's out the question but my point is what's the best gear ratio for my truck setup for mpgs i would like to get around 17 if possible its a rebuilt engine with good power just not for the tires, I believe 4:56 is to high of a gear and 5:29 is to low of a gear I'm thinking 4:88 as I run speeds ranging from 45 to 70 so it's not like I just putt around all the time even though I do most the week so opinions please any at all just need answers on gearing an automatic piece of junk I have to get this right thanks guys

waskillywabbit

iTrader: (-1)

Then run 4.88s. I'd but some stock 4.88s though.

:wabbit2:

YotaCurly

Sorry bout the two post lol where would I get them I was thinking about yukons gears

waskillywabbit

iTrader: (-1)

You can find 2 stock 4.88 diffs for under $500 shipped a lot cheaper than rehearing your current diffs.

:wabbit2:

YotaCurly

Were can I find these?

waskillywabbit

iTrader: (-1)

Junkyards. Classifieds. Craigslist. eBay.

:wabbit2:

4Crawler

iTrader: (3)

http://www.car-part.com/

blueknob

you want better mileage, get rid of the 33's

YotaCurly

No kidden^ lol but I got 1500 in tires no thanks gears is cheaper than new tires and thanks mr rabbit

wyoming9

iTrader: (1)

Your only chasing your tail on this!!

You want your cake and also the pie.

I doubt very much even changing gears will make that much difference.

You want better mileage put your vehicle on a diet !!

Strip every extra once of weight out that you can.

I would be happy with the 12 miles per gallon you get I am in the area of 7or 8 with the winter blend gas.:wabbit2:

Pat8942

And I feel bad when I get under 16mpg.

vasinvictor

iTrader: (3)

You get maximum economy at lowest RPM for a given speed. (see any hypermiling forum) If your auto shifts into O/D at 46mph, that's where you'll get max economy. I swapped from 4.88s (with 34x10s) to 4.10s and went from 18mpg to 22mpg. Now it'll be a slug with 4.10s and in town economy will suck hard. But highway mileage will improve if you drive it conservatively. Also anything over 60 dramatically decreases mileage. I guess I'm saying you might start by tightening the nut behind the wheel....

YotaCurly

Well my truck holds 3000 rpm for a long time at least as much as I stay on the gas and like I say I drive around town alot but I have trouble getting up to 65 it takes for ever and like for instance Remebering this is an auto it shifts from first good second hit 3000 but shifts good 3rd.. Will got 3500 4000 if I let it without letting of the gas but it will hold this rpm for about 5-7 seconds as I will hold the gas continuously because if I let off and it shifts at 2500 it will never get up to speed ..... It'll take days 4th will hit 3200 - 3500 at 3500 I'm at 65 and it'll shift in od at 2350 buts heres the catch I can barely keep over drive at 65... I have trouble so it constantly shifts from 3000-to 2500 if I have a load I can't hold over drive... I just run 3000 all the way
My point is I don't think I have the power to turn the tires if I got better in maybe a lil less in highway that's would be ok but my truck struggles getting 33 up to speed I believe this is my gas mileage problem don't y'all? The 3vze auto tranny is not a good tranny with big tires... But doesn't this sound reasonable ? I believe higher gears would create more struggle getting up to speed

YotaCurly

Better in town but maybe a lil lease in highway*

4Crawler

iTrader: (3)

What axle gearing do you have now? I know that at least with the 22RE, I got better MPG with 33s when I ran 5.29s than I do now with 4.88s. That was also with a manual transmission. But if you can restore the original engine RPMs for a given speed, the A/T shifting should improve and you can get the O/D gear back.

In my experience, the smaller Toyota engines are built to operate most efficiently at a certain RPM range and if you drop below that RPM range the fuel economy drops. Generally that RPM is about where the peak torque occurs and if you can stay there or above, you tend to do better in the MPG department. This likely also applies to the automatics, since the A/T ECU is unaware of the actual tire size or even your true speed (unless you have installed a calibration speedo gear box). All the ECU sees is the engine load and RPM as well as the drive shaft RPM. So if the axle gearing does not roughly match the tire size in an equivalent ratio to stock, the shift points and ECU calibration will be all off.

snobdds

...and like has already been said; your chasing your tail.

I don't see your thinking on this. Your going to regear to say a 4.88, which makes the RPM band increase. How is that going to get you better MPG's...? Regearing does not equate to better gas milage.

MOST people who go to a larger tire understand they're never going to get great gas milage. It's a given. They're just trying not to make it a slug and regearing is the only way.

You're not thinking this in the proper light...

vasinvictor

iTrader: (3)

If you have auto and v6 you should already have 4.88s. 4.56s at the least anyway. Maybe you have a engine problem or maybe driving too fast. I've had several with 33s, v6 and auto and they did great. Could hold OD at any speed. Still got 18 mpg on the freeway at 65mph.

YotaCurly

Nothing wrong with my engine and stock auto Toyota pickups most came with 4:30's? @snobdds my seeing here is it may run higher rpms but at more ease obviously therefore less fuel to move not to mention it decreases the rpm band back close to stock... Given over drive will run a lil higher but other shift points will be back to stock not to mention bringing my torque and power back at the same time

I've had my dad drive next to me to check speed lmao

YotaCurly

Not aiming for great gas mileage I want power back but the right set of gears can increase 3-4 or more Mpgs

YotaCurly

Bumptity bump bump any more opinions on this any will do thanks!update "I'm stuck between 5.29 and 4:88 gears with this dang automatic crap I'm In Germany ATM and can't tell you what gears I have ATM but I'm almost positive I don't have 4:88,s as I run 2300 at 65 mph and seems like it would be around three with lower gears I think I have around 4:10s I thank any one that has posted already !! I've read alot of forums just I want personal opinions thanks guys