I have an 05" 2500 4x4 HEMI QC with 35" BFG's and 3.73 gears. after the tires i noticed a power loss. should i go with 4.10, 4.27, or 4.56.

 

Sounds like we have the same setup, I have researched this and 4:56's seems to be the answer. I am having mine installed in 2 weeks. I can't stand the power loss, especially when I am pulling my toy hauler.....


Ken

 

If you are gonna change gears out you might as well go up to 4.56's They will turn those tires just fine. I've heard people say there is some top end power loss at about 70 though.

 

With my gears there was not top end power loss.... I was actuall able to go FASTER with the 4.56's than the original 3.55's. From 0MPH all the way to 110MPH it pulls hard all the way through the RPM range. When it goes into OD at 110MPH the 4.56's pull allot HARDER than the 3.55's ever did and got me well over 140MPH with ease... it was still pulling when I let off the gas.

SPEED SAFE, AIR RAM

 

What he said ^^^^^^^^^^.

 

I run smaller tires (285/50-20) and have the 4.56's...power loss above 70?... I frequently drive over 120 mph(my gauge only goes that high) and it feels effortless...as opposed to my former 3.92's which felt like I was goin to throw a rod whenever i got close to 110....

 

Got my 4:56's installed lat week, Man am I glad to have my truck back! Keep in mind that I have the manual tranny, but what a difference. I can't wait to see how she pulls my toy hauler. Took it up the grade here on the freeway and she pulled hard all the way, no need to drop into third at highway speeds.......Now if I can get my FLASHPAQ tuner to work I would be okay.

 

Well since you are running 3.73 gears now you would see a pretty descent differnence with 4.10gears. But if you want some serious accleration then I would go with 4.56gears but you better have good tires on your truck or will be seriously burning rubber.

 

I don't mean to hijack the thread but how much do gears cost with install and where do you buy them?