Engine/Transmission (1994 - 1998) NV5600 question

[SRehberg]

Thanks Chris, I pulled out a manual I dug up and sure enough, it states no exhaust brake to be used as you mentioned!

 

[JGrover]

JGrover, I'm running 4. 10 gears so when I hit 4th over the rpms start to go up fairly quickly at freeway speeds. I'm seriously thinking of changing the gears to 3. 54 or 3. 73 to help, but then 5th over would be pretty high. I see your RPM is pretty low in 5th over with the 3. 54 gears. I'm already to high geared in 5th over except for extremely flat running.



I'm one of those that hates to alter stock things, so I'm reluctant to change plates etc. With stock I don't have to worry about excess EGT's etc or popping a head gasket etc. Paranoid? Probably LOL.



Do you know if the GV is or isn't approved for use with a exhaust brake? I'm running one and it seems to work fine, but that could be a disaster waiting to happen if it isn't designed for it.



I had thought the NV5600 would be a good trans choice but with parts getting hard to get, it wouldn't be a good idea it seems. I doubt very much the previous owner of my truck fixed the 5th gear nut, so is there any warning, i. e. sounds or anything?



Thanks

I had heard the exhaust brake did not work with the GV. (I was bummed )In the low range it is 100% direct lock up. (No problem)But in the hi range the truck has to be doing 25mph to hold fluid pressure up to keep the gears pushed up into the hi range/OD position. Then it is full lockup till the pressure drops By the switch or by slowing down to much. Im glad you asked me, Because as long as youre speeds are high enough to keep the GV in Overdrive, Theres nothing you can hurt.

GV ph# is 800-999-9555 to confirm Just read all the other post about no engine brakes with the GV. (Bummer) Looks like, Use the engine brake in the low range. 4L/5L unless under emergency braking. That should be OK?

Ive got 164k and my 5th gear is still there. I overfilled my trans with a extra 16oz of syn gear oil from day one. Keeps that gear well lubed. I had a trans shop tell me the other day, That if you dont lose it by 60k, it should stay on Was told 1500. 00 rebuild mine with a fully splined mainshaft.