would swaping in a NV5600/G56 trans. in place of my NV4500 be as simple as finding the parts from a truck with a 6-speed and swaping them over? or is there a lil more work involved... im guessing a lil more work on the G56 end being its from a 3rd gen. i have a '99 NV4500 BTW

 

They no longer make part for a NV5600

 

yeah, what he said... I would'nt try the nv5600 swap. They don't make them anymore. Just the case alone is worth $1,000 just because they are so scarce. Cost me almost $4,000 just to have mine rebuilt. And that was with me dropping the trans off to them.

 

what about a G56?

 

Early small shaft DEA would swap right in, with new crossmember

Large shaft DEE requires new fywheel, clutch, pressure plate and crossmember

Both versions use unit-bellhousing - it's part of the transmission

NV4500 driveshaft is same, fits either way

 

so a full g56 (DEE) with the clutch, pressure plate and the bellhousing would bolt right up to the cummins with a flywheel and a new crossmember? what about the clutch mounting, is it the same as a NV4500?

also what is the difference between the early and late models?

srry for the questions im only familiar with the getrag

 

Your clutch slave cyl will bolt right up to the NV5600 b\h - DEA has poor synchro lubrication and a 1.250" input shaft - DEE has 1.3750" input shaft, needing new flywheel, clutch and pressure plate, and the gears were modified for improved synchro lubrication - otherwise samo samo alla time same same, no sweat, GI.

It is a big trans, at over 300lbs (yours weighs 180lbs), and was designed for heavy towing - it is not a 6-sp racing trans, as in the Viper, and does not respond very well to speed shifting, if that is your intent - otherwise, I bought mine broke and rebuilt it, because I like rowing thru the gears - sounds like an 18-wheeler

BTW - you seriously need to upgrade your sig.............

 

Well I am in the middle of same upgrade too, nv4500 to nv5600

Ok, what about transfer case ? My nv5600 came with the newer 271 transfer case, will 3rd gen driveshaft fit my rear end ?
How about front driveshaft ?

BTW the NV5600 doesn't weight 300lbs, it weights 550lbs !!!!

 

NV5600 actual weight = 390lbs, 200lbs more than the NV4500 - NP271 weighs 125lbs - NV5600 + NP271 weighs ~525lbs, lubed up and ready to ride

Your '01 will have the correct crossmember, but you will need the transmission support specifically for the NV5600, due to the increased weight - it looks the same as the one for NV4500, but has different part number and paint splash - remember, you're piling 200lbs more on that piece of rubber, so install the correct mount to keep the assembly centered and prevent driveline vibration

NP271 fits both DEA and DEE NV5600 - the NV4500 driveshaft may fit, but if it doesn't fit, just the front section from the center carrier forward will be different - the rear section is same length

And, whatever you do, don't pour automatic transmission fluid in the NV5600, or it will quickly burn the needle bearings and synchros - ever see black needle bearings, discolored from intense high heat?

Requires shafts, gears, bearings, and synchros to make it right

 

You're right it is 390, not bad at all.

Where I can but Castrol 75w-85 cheaper than the dealer, they charge $ 22.00/quart here

 

Yeah, I see what you meant - went back and read my post - that's a typo - should read 390lbs

DCJ uses Texaco syn trans fluid - Pennzoil makes syn manual trans fluid, much cheaper - the spec'ed fluid is near identical to 5W-30 syn motor oil, just without the lifter detergents - I've been running 3qts Valvoline 5W-30 syn motor oil and 2qts Valvoline syn 75W-90 gear lube for near 2 years with no problems, incl 3 750mi trips, but have not towed with it - if you tow, might be safer running the Pennzoil stuff