nv4500 fifth gear nut(Paging Rene)

[DEMON44]

yes red. i torqued mine in the truck while it was on hoist. waaay easier than wrestling with it. stuff a rag in the gears and pull away. you can use an updated nut. theres a couple different styles of aftermarket nut for it. you don't have to get a new mainshaft. Chevy nv4500s are not known to loose the 5th gear nut. nearly as often as dodge nv4500s behind the cummins.

theres a couple reasons. the GM 4500 has a balancer assembly on the tailshaft. the dodge 4500 doesn't. the cummins obviously makes way more torque than any Gm engine. and when you lug down the cummins....... because you can...... the torque in the low RPM range hammers the OEM nut off.

theres a pinch nut style replanment, a nut with setscrews.... all require red locktite. I threw a couple tack welds on my replacement nut on after it was torqued. never an issue after that. this was in my dodge. not my chevy dually.

I made a socket from a wheel nut socket too.

 

[DEMON44]

Buddy of mine dad has a 3/4 drive torque wrench. Just have to take the tranny up there one evening.

Should I add a few ft/lbs to the setting to make up for the loss in the socket.

wouldn't you would be subtracting torque.....not adding. because your center of leverage is away from actual center.

 

[bronc3buster842001]

wouldn't you would be subtracting torque.....not adding. because your center of leverage is away from actual center.

I have no idea. My socket dont look much different than the actual tool. if anything mine is just a hair longer.

 

[tRustyK5]

Run it as is, your application is so far away from what it takes to rattle that nut loose again it's not even funny. I'd torque to 275 with the tool you made with red loc-tite and call it good.

Have you bought the fluid for it yet? GM dealer is about the cheapest which should give you an idea. I recall spending about $100 just for the correct fluid.

Rene

 

[bronc3buster842001]

Haven't bought the fluid yet. My chevy dealer didn't have it. The dodge dealer had it at like 23 a quart. It will be a while before I need it anyway.

Need to get my ass in gear and finish welding my socket and take it to my buddys dad one evening to tighten the nut. Plus I still have to get some loctite.

 

[pseudomike]

I concur run it as.

Again, the shaft is the issue not the nut. I have seen guys weld the nut on and the gear still loosens up. Save your money, torque the nut you have, loctite, and run it.

The only the GM NV4500 with the damper is the '96 up diesel application. The damper was added because GM also had a problem with the nut loosening. They determined the harmonics of the diesel were the partial cause and added the damper.

 

[tRustyK5]

I think the damper was added in '95. My NV4500 is a '95 model from behind the diesel and it has the damper. I got it as a basket case with an input bearing failure due to low fluid level...but the nut was as tight as the day it was built.

I want to add that cheap insurance on a NV4500 is to overfill it by a half qt, it does not tolerate low fluid levels at all!

Rene

 

[bronc3buster842001]

Mine is from a 94. Was planning on buying 5 qts of oil. I think I have everything figured out.

 

[pseudomike]

Hmmm. Interesting indeed. I know for sure it was only found on the diesels, I was told only the later versions with the different cover and 1st gear had them. You learn something new every day. It's definitely a diesel thing.

1/2 quart extra is good insurance for sure.

 

[cybrfire]

Would one of you happen to know the length of the 4500? Say from engine block mounting surface to t case surface?

 

[cybrfire]

Looks like 27.5" overall length.

 

[sweetk30]

i know gm 2wd versions short tail style not 3500hd trucks . thay have a harmonic balencer on the yoke for the tail.

and i have also heard 1/2 qt over fill also.

did you check quad4x4 he sells the oil also.

 

[tRustyK5]

Looks like 27.5" overall length.

Exact same length as a 700R-4...

Rene

 

[pseudomike]

Looks like 27.5" overall length.

It depends which bell housing you are running.

Mine is longer but I have a Cummins bell housing on it.

I don't know if all the GM bell housings are the same length. You might need an Advance Adapters or internal slave GM if you are going to run it on a passenger drop truck. I am not 100% sure they are identical in overall dimensions.

 

[tRustyK5]

The AA bell is 6" deep, same as a SM 465 bell and I'm assuming the same as a factory GM NV4500 bell. I'm gonna guess Dodge went deeper so they could run a heavier clutch or something?

Rene

 

[pseudomike]

It's a honkin A$$ clutch! BiG fork, big bearing, 13" clutch. It's not much over 6" but it is over.

 

[DEMON44]

nv4500 dodge, stock its 12.25" if you upgrade the 4500 input to a NV5600 style 1 3/8", you can use a nv5600 style 13" clutch. or any one of a bunch of aftermarket 13" clutches, in single dual, or even triple disk now.

 

[CrewCab59]

5qts oil and pre 97 had the balancer inside only. The Gm 2wd had the fixed yoke with the balancer on the Yoke.

 

[kgblazerfive]

Bringing up an old thread what is the way to fix the fifth gear issue. Mine is a chevy trans with a dodge input and a bell housing with a 205 hanging off the end, behind a 6bt. It is making a horrid noise in fifth but fine in all the others. I have to pull it to do the motor swap in the k30 I thought I would fix it then.

 

[tRustyK5]

The good part is 5th lives outside of the main case, so diagnosis and access are both relatively good. I'd pull 5th gear and the nut and inspect the shaft itself for fretting. You could be lucky enough to find a loose nut before the failure...