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4.56 Gears Installed!

knez

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knez Enthusiast

knez

Posted
Posted

Well I picked up truck=2004 2500hd cc sb 8.1L 4x4 lifted 6in with 35's from shop.Couldn't get a real full throttle sotp difference because I have to break in.But defiantely can feel a difference in how tranny shifts throu gears(quicker).Didn't give it much more than half throttle does feel better thou,of course abs light came on.Now I need westers tune.Any recommendations on which tune to get I'll be pulling about 13k fifthwheel about 4000-6000 miles a yr.And do I have to worry about screwing anything up driving it like it is or just have to see abs light untill tune.

Haulin' 8.1 Enthusiast

Haulin' 8.1

Posted
Posted

Yeah Knez, congrats man. I can't wait to get mine in. I'm interested to see how your computer tuning helps out also. Heck I'm only running 265/70's but I feel the need for speed LOL.

 

Vernon

JRHDCrew Enthusiast

JRHDCrew

Posted
Posted

How much to swap out the gears ? I would love to go to the 3:73's on mine.

I dont tow anything that heavy and would like the improved gas mileage from the 4:10's.

The only thing I dont like about the truck....

 

 

John

Haulin' 8.1 Enthusiast

Haulin' 8.1

Posted
Posted

John I was quoted $950 to $1750 for front and rear. But that was before I scored Ebay gears for a steal.

 

The difference in mileage from 4.10 to 3.73 could easily be slightly worse in traffic but on long hauls it will be slightly better. Thing is it's really not enough to make up the expence anytime soon. If you could find someone who wants 4.10s and even swap you would be doing good.

 

Vernon

knez Enthusiast

knez

Posted
  • Author
Posted

Thanks Vernon. I hear ya.I only got to drive it for about 50 miles before I had to let the wife drive it due to sellling her car and Im drivin the old 89 5.0 stang till I get here a tahoe.Probably better that way cause I just want to lay in to it :banghead: before breakin it in!I'll defianetly post as soon as I get tune I was hoping some one thats done this before would give some input from their experience. JRHDCREW about $600 to $700 per diff depending on shop.What size of rear diff do you have and is it 4x4?I got 3.73 front and rear gears for 11.5 rear and 9.25 front with 25k miles on them.

JRHDCrew Enthusiast

JRHDCrew

Posted
Posted
What size of rear diff do you have and is it 4x4?I got 3.73 front and rear gears for 11.5 rear and 9.25 front with 25k miles on them.

 

 

 

 

I dont know what Size it is but it is a 4X4 with the 4:10's.

Its an 04 HD CrewCab with the 6.0 Litre.

 

So the gas mileage won't be much better with the 3.73's instead of the 4.10's ?

Thought I would see a big change....guess Im looking for miracles.

 

LOVE the truck hate the gas consumption.....Oh well I'll deal with it :banghead:

 

 

John

knez Enthusiast

knez

Posted
  • Author
Posted

I believe your rear diff is a 10.5 and front is same 9.25 so front gears would work but I dont think youd see much of a gain worth spending money over

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