My understanding is that all 06s had the 3.73. I do not recall any other option when I purchased my truck.

 

Oh thats plagiarism.......... or maybe just false accusations

 

It's best to jack up a wheel and spin the driveshaft. Make a mark and count how many revos it takes to make the tire spin once around.

It should be on a tag also on the differential I believe, but who knows?

 

okay they are 3.73, thanks guys, i just spin the tires and it took 3 3/4, so i know they are 3.73

 

That's incorrect. You could get the auto with 4.10 gears for any year. Manual only came with 3.73's until 07.5-08. Then you could get the manual with 3.42's.

 

My 06 g56 truck has 4.10's ... go figure!

 

Dodge didn't have the option for 4.10s with the G-56 in '06/07. Only way you could have them is if you swapped the 3.73s out for 4.10s. My 3.73s run the same RPMs as my buddies 6 speed Ford ZF trans with 4.10s...