The NV4500 Debuted in 1992 behind GM's 350s, 454s and GMs 6.5 Diesels.
Within the same year it also was used in 1992 Dodge 1/2 and 3/4 ton pick-ups with V-6 and V-8 engines, replacing the A-535 used in the 1/2 ton pickups.
With the GM V-8 diesel (6.5), there were obviously similar vibrations and harmonics involved, so the idea that they weren't "thinking of diesel harmonics" when it was designed, is hardly a valid argument.

Also, as part of my case, I have dis-assembled numerous of the pre-Cummins NV4500s, of GM application and Dodge applications, and none (that is N-O-N-E) had ever shown signs of 5th gear nut replacement, loosening, or other damage, PRIOR to the '94 models from behind the Cummins, installed in the Dodge trucks.

There are also several rebuilders of the NV4500 who WILL NOT WARRANTY an NV4500 that has a failure due to overload and/or towing in overdrive, EVEN with the fully-splined mainshaft and special nut assembly that has been dreamt up for it.
They know it's inferiorities, too.

Mark.

 

I have the advanced adapters kit i bought through a local trans shop, was gonna get them to do it cause i work outta town, but got some time off now so i'll do it myself. I dont have the instructions, it all sounds pretty straightforward, but am wondering what else i'm gonna have to do in prep, like having the retainer machined etc. was wondering if some one would have a copy they could pm to me.... or maybe AA could send me a pdf....hmmmmmm

 

i sieriously doubt that

 

You might want to check out Quad 4X4s Torque King fix for the NV4500HD 4X4 only. It does have a warranty.

http://www.torqueking.com/torque%20king%20nv4500.htm

Bob

 

The harmonics of the Gubmint Motors diesels will be different than the gas engines, but it is still different than the Cummins. And the Cummins, I'm certain, has better HP and TQ numbers. The combination of torque and harmonics could be what does it.

Mythbusters found the resonance of an old bridge and were afraid to walk on it, with an oscillating weight of less than a pound.

Vibrations are funny things.

 

Scot, while I tend to agree with that assessment, the basic build of the transmission is the same, GM, Dodge, Gasser or diesel.
Dodge used the wandering 5th gear nut, same as Chevy, Gassers or diesels, they even used a larger main shaft and nut on the Dodge diesel, yet the problem was, and still is, the design.
Even the gassers will back the nuts off, with enough overloading.
You're more likely to break a main shaft on the gasser trans., however.

Regardless, there are re-builders out there that WILL NOT warranty an NV4500 that has been towed heavy in overdrive and is brought to them for warranty work.
They know when this happens and they have a way to check for it.

There is no warranty for blatant abuse.

Mark.

 

Maybe something like this?
http://www.advanceadapters.com/downloads/712585.pdf

 

That's exactly what I needed, Plcnut, I appreciate that right there!

 

Wow, this is the 1st thread I have read that has a large amount of people making arguments FOR the Getrag. My Getrag makes some noise under hard acceleration in 4th gear and a vary strange noise at idle if I am bellow 800 RPM's. I was considering trying to round up a 4500 but now I don't know what to do LOL

 

The Getrag is a good transmission for it's original power level, some people have even pushed double and triple it's OEM horsepower through it, but I'd also bet they don't tow a lot, either.
The Getrag's big crutch was that many were set-up wrong when new and went bad in very short order, thus have had a bad rap.
PROPERLY rebuilt, with a good synthetic lube and an overfill, they hold up fine for their ORIGINAL GCVW rating.
Complaints range from leaking excessively, ill-shifting, noisy, excessive "backlash" in the mainshaft-cluster, and chattering when under load at lower RPMs.

The NV4500 IS also a good transmission.
It's just that some people, as with the G-360, choose to ignore it's shortcomings, as stock, and abuse them by loading them heavy and turning up the engines 100% or more, causing mainshaft flex and the resulting "loose nut" issue.

That's what happens when a "Light Duty" class transmission is put into what should be classed as a "Medium Duty" truck, then expected to pull 24,000 pounds plus.
"BOOM goes the Dynamite!"

It's too bad the NV5600 is such an expensive and intricate (ship in a bottle) transmission to rebuild, with it's own major issues.
It's really one of the best options for towing AND fuel mileage in an older truck, but parts are obscenely expensive, when they are even available.
Nevermind attempting to get even a usable "CORE" one.
It's biggest issues are mainshaft breakage, usually occurring due to low lube levels that locks the rear mainshaft bearing, or water contamination.
Abuse has claimed many, as well.
It is also prone to sychronizer damage primarily caused by low lube levels or improper lubricant.

Each and every one of these manual transmissions are a good to great transmission when used in it's proper load range.
If you go beyond that, or not take note of some issues that each has, then sure, you'll have problems.

Personally, I prefer the Getrag.
I like it for it's simplicity and relatively cheap expense in rebuild, plus the fact that once it's together, short of grossly overloading it, or losing lubricant, there is nothing in the transmission that will potentially cause catastrophic failure.

Mark.