Why did my nv5600 have catastrophic failure??

[Swamp Donkey]

On friday my truck will be @ the dealership for 3 weeks. Waiting for a new transmission.



My driving style consisted of always using 1st gear starts, never ever any speed shifting/racing/sled pullin/clutchless gear changes. Upshifted around 2000 rpm's and never lugged the engine.



The only thing I can think that killed my nv5600 is that I drove kinda slow. I drive around 300 km's a day and alot of that is at around 80 km/h. (50 mph. ) That puts me @ around 1450 rpm. I know I said I did not lug my engine, but it seems fine running @ those speeds and rpm.



When it crapped out on me I was just driving and shifting like normal. Then when I tried to go into 5th it just started grinding. Never had a hard shift in any gear, even in 5th. So I figure something fell apart in there to go from nice normal shifting it's whole life to grinding every time going into 5th. Every other gear shifted fine even when I dropped it off @ the dealership.



The dealership tells me there is no estimated time of arival for a replacement transmission. 115,000 km's or 70,000 miles... ... ..... just around the end of warranty!

 

[MMeier]

Hate to say it donk, but shifting a 3rd gen @2k and running around @1450 or so is lugging it. Probably didn't help anything. Why mine went boom is I work the dog doodoo out of it, still don't think it should have gone south, but... anyone here need a 5600 4Wd unit, getting turned in for core charges in 2 weeks.

 

[klenger]

It doesn't seem like lugging the engine would take out the transmission. In any case, I don't drive any more aggressively myself. Sometimes, stuff happens. Probably has nothing to do with the way you drove it.

 

[Radshooter]

Please keep us updated and let us know what they say was wrong. Ask them what they think happened.

Thanks.

Steve

 

[jwilliams3]

I would say the low rpm running starved it for oil.

But who knows. Many say the stock fill is not sufficient with the Nv5600.

So I overfill mine to keep things in the bath.

 

[n7gxz]

SD,



You did not have a catastrophic failure (though it may seem like it). What happened was the syncro on 5th gear went out. If you are good at matching engine speed with road speed it would have shifted without grinding. I had all of the syncros go out in my 2nd gen within about 500 miles, the truck had about 120K miles on it when they went. I pulled the box out and sent it into a rebuilder, had it back in a week.



Kevin

 

[jelag]

I agree with Kevin..... my 04 has 210K miles and has given great service... . I'm going to guess that it just died from some problem. . we tow with our all the time... I can't believe that you did something to cause it.....