Axle gearing

[Purdue_stroker]

I've had my truck for awhile now, and after I got it I learned it had the 3.31 gears rather than the 3.55s. Didn't bother me at all. Till I put 35s on it. Now I can't stand it. Truck is way slower, fuel milage went down the drain, and it's taking its toll on my torque converter taking off with heavy loads. How much would I be looking at coat wise for parts and labor to change my gearing to 3.55s? Or would I be better off to try to find 2 axles to swap in then sell my axles? If anybody on here wants to swap axles aswell I'd throw in some cash!


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[bigrpowr]

I've had my truck for awhile now, and after I got it I learned it had the 3.31 gears rather than the 3.55s. Didn't bother me at all. Till I put 35s on it. Now I can't stand it. Truck is way slower, fuel milage went down the drain, and it's taking its toll on my torque converter taking off with heavy loads. How much would I be looking at coat wise for parts and labor to change my gearing to 3.55s? Or would I be better off to try to find 2 axles to swap in then sell my axles? If anybody on here wants to swap axles aswell I'd throw in some cash!


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anywhere from $1400- $1800 , using all fomoco ring and pinion and spicer seals and bearings. that would include labor. and i agree with the power loss, i have same setup, but it has gotten a lot better with the turbo. you are just rolling around in a very low power zone, staying way below peak power.

 

[Randy_270]

If you're gonna re-gear why not go to 3.73s? Then with the 35s it would be like 3.55s with 33s. 33x3.73=123.09/35=3.52 gears. Just food for thought.

 

[bigrpowr]

If you're gonna re-gear why not go to 3.73s? Then with the 35s it would be like 3.55s with 33s. 33x3.73=123.09/35=3.52 gears. Just food for thought.

That's what I'm doing. Already have the gears.

 

[Dzchey21]

yeah i would agree that a 3.73 is more fitting since the 6.7s have 2 overdrives, so if you are going to make the swap go to 3.73

 

[RedRice589]

Trucks would really shine with 35's and 4.10's..... IMO my 6.4 loved them especially for the amount of pulling I do. But this truck does well with 3.55's I might be prone to try a 3.73

 

[Purdue_stroker]

If you're gonna re-gear why not go to 3.73s? Then with the 35s it would be like 3.55s with 33s. 33x3.73=123.09/35=3.52 gears. Just food for thought.

I thought of that too, but they come from the factory with dang near 35s and 3.55s and I like how they run. So I figured id stick with 3.55s cause I know I'll be happy with the setup


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[MadDiesel73]

yea i was actually just talking about that think im going to try 3.73 i have 3.31's now and 35's

what do you guys turn at 70? i think if i remember correctly im just at or slightly below 1500rpm

what do stock trucks with stock tires and 3.55's turn?

 

[Dzchey21]

im not sure at 70 but with 33s 3.55s in 6th gear at 80 im right at 1900

 

[lincolnlocker]

im not sure at 70 but with 33s 3.55s in 6th gear at 80 im right at 1900

Same here... stock tire size which is a lil over 33"..

 

[MadDiesel73]

are 2011+ gears/axles the same as older trucks?

 

[lincolnlocker]

Same axle. Basic gears are 3.31 and 3.55 with 3.73s being special order afaik.

Drw are 3.73s with 4.10s being special order afaik.

live life full throttle

 

[Purdue_stroker]

That's what I'm doing. Already have the gears.

When do plan on doing it? I'd like to hear how happy you are with the results


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[Dzchey21]

are 2011+ gears/axles the same as older trucks?

I have heard that the pinion is bigger on 2011+ trucks with a greater than 10,000 lb gvwr and 37 spline axles, hopefully someone can clarify this

 

[lincolnlocker]

I have heard that the pinion is bigger on 2011+ trucks with a greater than 10,000 lb gvwr and 37 spline axles, hopefully someone can clarify this

That would be nice.

live life full throttle

 

[MadDiesel73]

X2 on hearing how bigrpowr likes the gears and if 2011's are different.

 

[Randy_270]

According to Randy's Ring & Pinion the older Sterling's were 31 spline where as the 2011+ are 37 spline

 

[smoker00]

I would love 3.31 in my truck.. or higher if i could..

 

[bigrpowr]

I would love 3.31 in my truck.. or higher if i could..

ill sell you mine.

 

[lincolnlocker]

I would love 3.31 in my truck.. or higher if i could..

Goin for the land speed record or what?

live life full throttle