you swaped a nv5600 for a g56 and..

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squirrels

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g56 to nv5600 swap opinoins

I've broke two G56, second one was from lazar smith, and I'm not sure i want to put one back in my 750horse dd/ puller. So to the guys that have swaped to the NV was it a good choice? What have you broke if anything? And how is to drive compared to the G? I found a NV locally with an 1 3/8" input, don't know which way to go. Thanks.
 
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We have done a couple in 800+ hp trucks. So far they have held up, but now other parts take a dump farther down the driveline.
 
Wow you guys are saying the NV will hold up to more power or better fir pulling than the G56? I have no experience with the G56 but thought it may be better.
 
I've seen an output go but that was only after 2 seasons in a 2.6 truck, then hear others tearing them up just pulling trailers. I just don't want to change clutch and drive line just to end up with a broke nv. Are there any shops that upgrde these nv's?
 
i think the nv4500 is the best out of the nv5600 and g56. i dont know how much/how long you could expect one to last tho. thats alot of power to run through one. billet input shaft and the upgraded 5th hear and i think it will last longer than the g56 but still kind of a crap shoot. my neighbor is swapping a 12 valve into his mega cab at the moment and everyone he talked to said to use the nv4500 for the conversion because the g56 isnt as strong
 
NV4500's are the least expensive to fix and easiest to get parts for.
 
Swapped my g56 for a 5600. Sheared an input off the 5600 just rolling into it driving. Went to auto now. 5600 is really a butt pain to repair when it does break. Such a bigger market for 4500 stuff.
 
G56s are weaker than the 5600s... 5600s have a 1 3/8 input factory. most of the problems i have seen are from breaking mainshafts sled pulling in 2nd high.
 
5600 is harder to shift fast and parts are not cheap but it is the strongest. If you drive it hard on the street do a 4500 and learn how to rebuild it yourself. 4500 is not the strongest but parts are cheap

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All I broke on my 5600 was 5th gear syncros. It was a DD, tow rig, workstock puller for 6 years. Nowhere near your power levels but strong. Not sure on the 56 other than what I have read on here.
 
I would take anything over a G56, if the truck is a DD you will get better mileage from the higher final gear as well.
 
Would i be able to run my clutch in the nv since the input is same size or are splines diff. Who offers billet parts for the nv's? I have a nv4500 out of a chevy but i have a feeling it's going suck for dd. chevy is apart never drove anything with nv4500. thanks
 
We sell billet inputs, I would get the rest of it cryo'd. It will drive like a truck with the nv4500
 
There is some good info in here. My friends in the manual ctd crew always thought the g56 was better. Their trucks aren't making these kinds of power numbers though.
 
Fireman450 said:
G56s are weaker than the 5600s... 5600s have a 1 3/8 input factory. most of the problems i have seen are from breaking mainshafts sled pulling in 2nd high.
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All of the 6 speeds in the Dodges have 1 3/8 input shafts Nv5600 and G56. The big difference is the G56 is aluminum case the the NV5600 is cast iron.

I have had a g56 behind a 650 hp engine for 80,000 miles now. Just a Haisley Street twin and a billet flywheel and it has handled everything thus far. I pull loads up to 35,000 lbs and from time to time floor it in 5th and break the tires loose. I have yet to break anything. Keeping my fingers crossed though. Just giving an example of what I have seen. I did go with Lazarsmith's gorilla oil when the trans had around 70,000 miles.
 
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I'm pretty sure a few nv5600's don't have the big input. Wasn't there a couple in the early trucks that had small inputs?
 
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I'm pretty sure a few nv5600's don't have the big input. Wasn't there a couple in the early trucks that had small inputs?
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Not that I'm aware of. All NV5600s had the 13in. Clutch plate which has a 1 3/8 diameter spline. I used to have a 2002 Dodge and it had the 1 3/8 shaft. I know in 2000 there weren't many produced due to availability and I know the 2001s had 1 3/8 shafts too. Some one chime in if I'm wrong about the 2000s.

All the low output CRs with the NV4500 had the 1 1/4 inputs.
 
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