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Hello Everyone

 

So my truck has developed a new issue this past weekend.  Heading home from the mountains I was cruising at about 75 in 5th gear.  Pulled out to a pass a truck and began to accelerate.  Let off for a second and the transmission began to make a clunking/knocking ticking sound.  Kind of sounds like the teeth are slipping past each other or not meshing correctly.  Only happens in 5th all other gears seem fine.  I'm thinking I either lost some teeth on a gear or the shift fork/pins brake and its not engaging the gear all the way.  Anybody experience anything similar?  Finally do I have to pull the transmission to change out the overdrive gears if that is the problem?  The transmission was rebuilt by a reputable shop about 70000 miles ago so I don't think its in too bad of shape other than said issue.  Truck is a 98- 24v,  4x4.  

 

Thanks

Bill 

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Just now, Dieselfuture said:

Sounds like you're having the famous 5th gear nut problem :shrug:

Its possible I have been down that road before.....   It would be an updated shaft failing this time if it is.

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391k miles. Never had a 5th gear nut problem and never broke the input shaft. 

 

OEM shaft I broke at the 3rd/4th shift ring. Now running the upgraded mainshaft. Make sure if you going to tight that again make sure to get the sockets and the torque spec. Don't quote me be I think the upgraded shaft is like 600 foot pounds on the nut. This is why I laugh at all the YouTube videos of guys hammer and chisel the nut on and then tack weld the 5th gear nut. This will not work and will fail again.  

 

Still currently using the Mobil 50 SAE Trans Fluid no issues to date. Working awesome and heading to 150k miles. 

 

Image result for mopar1973man mainshaft

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Have you seen a nut failure on an upgraded shaft? I’m thinking it’s something else this time. But yes I agree if I take it off I definitely need to assemble it correctly. 

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How much do you trust your shop that did rebuilt. They could of said new shaft and didn't. Other than that grinding clunking in gear when I had my Mustang with t5 meant that the main cluster great had teef missing. Not sure on nv4500

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55 minutes ago, Dieselfuture said:

How much do you trust your shop that did rebuilt. They could of said new shaft and didn't. Other than that grinding clunking in gear when I had my Mustang with t5 meant that the main cluster great had teef missing. Not sure on nv4500

It was inland truck parts here in Montana that did it. They seem pretty reputable. Plus the company I was working for did a lot of business with them.  This failure seems different than the nut coming off. I guess I will tear into it and find out. 

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