gearing

Ok, I have no idea if this is in the right section. but Im lookin to regear to 4.10 gears now I have a chance to buy some rear 4.10 gears for the rear for cheap would it be bad put the 4.10's in or what? if I can what would I expect to happen? better mpg's? gain some power back? just to be clear I have a 05 trd sr5 sport dbl cab sb with auto

 

Are you 4x4?


And you can expect your low end power back. Might lose a little gas mileage but nothing severe.

 

sorry ya 4x4 but there for a manual would it still work for the auto? and I have a 3 inch lift with 285/70/17 tires should have clarified that up a bit

 

If you are 4x4 you have to regear front AND rear. If not the drive train spins at different speeds and will rip apart.

 

ok well thats a no go haha thanks for info man

 

Or dont engage 4x at all and just be 2 wheel...

 

and it would still work? but I thought the mpgs would go up though not down

 

Makes your motor spin faster = more gas.

 

are the front and rear grears different?

 

Your motor doesnt actually spin faster. But your RPM's will go up some. The gears make the tires move because faster and the engine does less work to do the same speed. I am regeared. If I hold at 60-65 I get great MPG but since I run with traffic at 70+ I am getting 12.5 with out recalculating the differnece between what the odometer says and my actual miles traveled.

Check these out

http://www.ringpinion.com/Calculators/Calculators.aspx

 

They are the same ratio but the fronts are Reversed.

 

MPG is not solely based on RPM's.
While it does play a large part, fuel consumption also heavily relies on engine load as well as throttle position.
This is why its better to downshift instead of lug the engine.

Lower (numerically higher) gears will give more power at a certain speed, thus taking away some load on the engine which in turn would net an increase in MPG.

 

RPM is a rate of spin. Up = faster

 

but your speed will actually be faster as well

 

This chart seems to disagree. Your assumption is that with 3.73 there is serious lugging and with 4.1 there isn't.

 

so should I get them there 50 bucks and just nor put it into 4 wheel drive

 

according to that chart I would be in the green

 

And you are in the better mpg yellow now right 3.73 and 33s.

 

Call chase at East coast gear supply. They have new and used sets cheaper than most. Wont beat the $50 though... lol

He can answer any questions on the technical side.

 

ya in the yellow now and would move to the green if i did the regear