jj I run 4.56 truck had 3.55 stock. I run 285/70/17 tires so really not 4.56 final ratio. They do whine, very little. I also tow 8k travel trailer. Go with the 4.56. You will regret the 4.10's.

 

For what it's worth, I think the 4.1 would be just fine pulling that kind of weight as long as you don't have oversized tires on the truck. I have to agree that most aftermarket 4.56 have a certain 'sound' to them. I know mine do and it doesn't bother me but my truck doesn't do much other than city or trailering so the 4.56 are a great choice for me. It's obviously hard to recommend anything without really knowing your situation but I think when it comes down to it, the only real drawback to going 4.56 is revs at higway speeds/mpg when empty. If that doesn't bother you, I think the potential of still wanting more towing power after spending all that cash outweighs a bit of extra gas here and there. I wanted to make sure I got my money's worth so I went big right away and certainly don't regret skipping the 4.10 for what I use it for.

 

do i need a progammer for the truck to run and shift right???

 

To the op.
Most aftermarket gears are made to a low price.
The quality is not even as good as OEM and indeed, some haven't even been run in on a jig, to bed them in before shipping.
Result = noisey gears.
I'm installing a set of 4:56 Motives next week and my gear guy who runs all kinds of drag cars and has a specialist business doing quality vehicle work, showed me a new set of "Strange" gears for a car he's building.
The machining and quality of materials on the Strange gears, blew away my new Motive 4:56 gear set.
There was no comparison really.
He said my gears will be set up bang on, but to expect some noise due to this factor.
As for revs being too high at highway speeds, yes your rpms will be raised but at 70mph with 33-34 inch wheels most people turn about 2000-2200rpm.
The sweet spot for the Hemi.
Over that, your mpg will drop.
Towing will be improved due to a significantly better mechanical advantage of you new gear choice. That's why in town/city driving, you should pick up between 1-2 mpg's as its easier to get a big *** QC moving from a stop as in my case.
I personally would change the oil at 500 miles, as its cheap piece of mind to remove any swarf from bedding in the new gear sets if you've purchased the cheaper gears.
Just my personal opinion.
If your gears gave already been run in on a jig and they are of a high quality such as my friends Strange set, there really is no need to change it or take things easy either for the 500 miles or so as usually suggested.
Hope this helps??
Al.

 

jj you can run a programmer if you like. Its not necessary. I don't run a programmer, however alot of guys here do.

 

Only reason you will want to is so that your speedometer isn't way far off... and I believe the shifting is adjusted in some way as well, but that might only be on newer 08+ trucks...

 

If you have stock tires, speedo won't be affected. Been there done that.

 

Give this a read just to be sure...

https://dodgeforum.com/forum/3rd-gen...ur-speedo.html

Enjoy

 

thanks zero! That was a good read

 

This might be off topic but im wanting to do 4.10s. Im trying to decide if it will be cheaper and easier to just buy the ring and pinion for the front and rear along with a master install kit using my open diffs or have a complete 4.10 lsd installed?