What gears

switchblade906 · #1 04-06-2009, 11:32 PM

im going to be getting a LSD soon and i was thinking that since there going to be in there anyways why not just change the front and rear gears too.

so i want to know what gears you guys think i should get??

i will be getting a 6" lift and on 35's hopefully in the next 2-3 months

EDIT: here we go a tire and gear chart.
http://www.4lo.com/calc/geartable.htm

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MOPWR2U · #2 04-07-2009, 12:33 AM

4.56 or 4.88. These trucks have got a deep overdrive in the transmission, and you will stay in top gear longer with the lower gears, and get better gas mileage than with taller gears that make the truck downshift for every freeway overpass.

It depends on how soon you are going to be switching to the 35" tires though. If you are changing gears now, and tires next month, get the 4.88s. If you are changing gears now, and tires next year, get the 4.56s.

MOPWR2U

chrisp929 · #3 04-07-2009, 12:49 AM

Quote:

Originally Posted by MOPWR2U

4.56 or 4.88. These trucks have got a deep overdrive in the transmission, and you will stay in top gear longer with the lower gears, and get better gas mileage than with taller gears that make the truck downshift for every freeway overpass.

It depends on how soon you are going to be switching to the 35" tires though. If you are changing gears now, and tires next month, get the 4.88s. If you are changing gears now, and tires next year, get the 4.56s.

MOPWR2U

god man, is it me or does the move you suggest sound VERY drastic ? ..
i mean really ? 4.88's ? isnt even 4.56's a bit much ?

I know the factory 3.21's are an abomination, and the same goes for the factory 3.55's with factory 20's .. but to suggest that much gearing ? . im a novice at this but .. phew .. maybe im totally off on this ..
How much MPG would one loose going to say .. 4.56's with 35" tires ?

JM1517 · #4 04-07-2009, 01:46 AM

I had 4.56's with 35" tires on a 2000 F150, and it was a great combination. I believe on the 4 Wheel Parts web site has a chart and formula to determine which gear/tire combination is right for your needs. At the time I was undecided between 4.10's and 4.56's, but after doing some research I found the 4.10's would have kept me at the stock ratio of 3.55 with 35" tires. I opted for the 4.56's which I believe worked out to about 3.90:1 ratio. It definitely helped with the performance.

jagass · #5 04-07-2009, 02:09 AM

Good luck man...

bigred3297 · #6 04-07-2009, 05:21 AM

i am planning on going 4.88 with 37's in the next year. Im not very knowledgeable about gearing but the great info on here helped on my decision. I'm waiting to be told that my warranty is null after dodge files though

.....not sure whether to be sad, angry, or happy about the situation though

i still have some more questions though... I'll have to get 4.88's for the front and the rear as long with an lsd or locker? is this correct, if so could i get a couple of you guys to put together a parts list for me... gears and lsd or locker, i want it to be affordable but not suffer integrity, so i guess the best bang for the buck..

switchblade906 · #7 04-07-2009, 09:03 AM

look at my first post for a link that i posted.

MOPWR2U · #8 04-07-2009, 09:48 AM

Quote:

Originally Posted by chrisp929

god man, is it me or does the move you suggest sound VERY drastic ? ..
i mean really ? 4.88's ? isnt even 4.56's a bit much ?

I am basing my recommendation on my own experiences. I have 4.88 gears in my Jeep, which has 37" tires on it. And the Jeep is geared way too tall for highway use. It has an overdrive automatic transmission similar to these trucks, and I am almost never in high gear on the highway with the Jeep, unless it is downhill. When it is downhill I get 19 mpg with the Jeep, WITH 37" TIRES! But when it is level ground the Jeep very frequently downshifts to third gear, and I get about 12 mpg. When it is uphill the Jeep downshift to SECOND GEAR, and I get about 8 mpg. 37" tires are too big for 4.88 gears, and the Jeep would drive much much better on the highway if it had 35" tires and the 4.88 gears. Alternatively, the Jeep would drive better on the highway with 5.13 or 5.38 gears if I were to keep the 37" tires. I have to keep the gears I have though, because the front axle is a high pinion Ford 9" from Currie Enterprises, and the lowest gearing that is available for that axle is 4.88. So my next set of tires is going to be a set of 35s, and I'll lower the suspension an inch to go with the smaller tires.

turk1270 · #9 04-07-2009, 09:59 AM

if your goin to to buy gears i would get the 4.56 for the 35s and if you want to run the 37s the 4.56 will do just fine.

switchblade906 · #10 04-07-2009, 10:27 AM

Yeah that's what I decided on after taking a look at that chart

Thanks guys