Which Input Shaft Is In My 6 Speed?
 

Its a 2000 standard output. But it has a DEE code six speed. It has the 3/4" aluminum spacer. Everything points to the larger input, but everyone says a 2000 SO has the smaller one. I am going to order a dual disc South Bend, but they dont take those in return if it dont fit. And id hate to have a 1700 clutch not fit. So im guessing its the 1 3/8". Any one else concur?

Dodge introduced the NV5600 6 speed in 1998. The early version, which is found in 1998 to 2000½ models is known to have synchronizer problems and a weak input shaft. Midway during the 2000 model year, a much improved NV5600 was introduced with a heavier 1 3/8" input shaft and reliable synchronizers. At the same time, the old 12.4" clutch was dropped in favor of a 13" unit.

The NV5600, which weighs in at 465 lbs. is rated to handle nearly 20% more torque then the NV4500HD five speed. First gear and high gear are essentially the same ratios for both the NV4500 & 5600. Reverse gear is lower in the 5600 then most 4500's. The direct gear (1:1 ratio) for the 5600 is 5th, in the 4500 it's 4th. From a drivability standpoint, the difference between the two transmissions is the close ratio spacing of the 5600 doing in five gears what the 4500 does in four. Close shift ratios is a great asset for hauling and towing but a bit of a liability for daily city driving. The 6th or overdrive gear is mounted on the front of the mainshaft instead of the back like the NV4500. Consequently, the NV5600 does not have the problem of the mainshaft nut backing off.

Great information, but is it a large input shaft? The door tag say manufactor date as 11/99

I am thinking no. Sure sounds like a smaller 1 1/4 input to me. You can get the new input shaft from South Bend when you order the clutch, and from what I see its a pretty easy thing to install. Then you'll be set!

well diesel nut im not tryin to argue but everything ive read on it points to 1 3/8 but im not exactly sure without pulling the tranny, which i cant do till the new clutch is ready to go in.

According to this:

http://www.dodgeram.org/tech/transmi...5600_spec.html

Your input shaft SHOULD be the big boy. DC apparantely started using the bigger shafts on Aug/99.

mine was made 12/99 it had 1.250 had to up grade to 1.375