[topdwg]

Ok, so I'm finally going to get my gears just wanted everyones opinions on which ones to get? Currently I'm running 3:73's on 20's and from what Randy's Ring and Pinion website here is the rpm ranges for all:

When I was running stock (3:73's and 31 in tires): RPM at 55: 2283
With 4:30's: 2205
With 4:56's: 2339
What I'm at with my 37's and 3:73's: 1913 (all bad!)

As you can see my rpm range right now is horrible and I need to get this done....

The 4:30's would put me closest back to stock, but I pull a 30 foot fifth wheel so I'm thinking about just going with the 4:56's? Not to mention the 4:56's are about $100 cheaper per axle.

Would running the 4:56's be bad on the highway? Anyone currently running 4:56's on 37's and if so how do you like them? Thanks all...

 

[Abrannan19]

I say 4.30's if you go higher it will suck on the interstate

 

[topdwg]

That's what I was thinking. Do you really think an rpm difference of (2339-2205) 134 would make it that bad on the interstate?

 

[Abrannan19]

I cant say, I just like the fact that I can get 4.30 gears from ford..OEM stuff is what I like, that's why I am gonna (eventually) do 4.30's in my truck.

 

[topdwg]

Yea I liked that idea to, but man they are so much more expensive, roughly $100 more!

 

[Abrannan19]

IMO its worth the extra 100

 

[topdwg]

Yea, but Yukon makes some pretty good gears too....

 

[StarDriver]

As long as your over 2000 rpm, you'll be fine. 2200 is comfortable.

 

[Abrannan19]

MPG start to suck at anything over 2k RPM's

 

[StarDriver]

MPG start to suck at anything over 2k RPM's

Anything below that pulling a trailer and my milage is actually WORSE.

 

[Hardline]

You stated your RPMs at 55 MPH. If you do drive that way on the interstate you would be ok with the 456s. If you like to cruise at 75 I think you would be killing your mileage and would be better off with the 430s. JJ

 

[Lbs]

Look into Yukon, I've triend yukon and percision and both are great gears.

 

[05diesel60]

Personally I say 4.30. A little more versatile than the 4.56. Although a great gear, a little overkill, especially for daily driving application.

 

[GregsSD]

I would say go with the 4.56 since you tow a large trailer, you will be happy with a little extra torque for towing and you will love it for around town driving!

I run 4.30 gears with 35" tires and tow a 26' toyhauler and sometimes wish I had 4.56 for the extra torque.

If you don't tow the trailer very often and you do alot of freeway driving then I would say go with the 4.30.:thumb:

 

[topdwg]

Decisions, decisions,,,,LOL