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dodge fifth gear nut

I have the updated nut with NO welds.. no problems at all.. how can welding to the shaft be a good thing? changing too many properties there..
 
If you really look into it, a fully splined mainshaft is the only true solution. Everything else is just a bandaid masking the real problem. Even if the 5th gear nut never comes loose, the partial splines with eventually wear down to a point that the 5th gear splines just slip by the splines on the mainshaft and no power is transmitted. It is a problem with the original design of the transmission.
 
Lucky Jeff said:
I have the updated nut with NO welds.. no problems at all.. how can welding to the shaft be a good thing? changing too many properties there..
Click to expand...

Your heat effect zone is going to be soo small on an already hard as piss shaft it won't make that much difference in strength or material characteristics...

But like boomer said, it is a band-aid fix...
 
well I only say it because I know people who have the updated nut and no problems. And the fully splined main shaft with no problems. But I don't know anyone who has welded theirs, and not had any problems.
 
For the record guys tack weld there front shafts on the toy stuff(martach) and flog the crap outa the rigs--with no shaft breaks. The area of heat build up is soo small it should not affect anything....
 
the reason the welds dont hold is because it is a hardened shaft. i had a feeling it could come off. but i was just crossing my fingers and it failed.
 
If the splines are NOT worn the weld will hold for a long time. If the splines are sloppy and allows the gear to walk a little the welds will break. most of the ones I have seen break have almost or over 200k. I still have the original 5th gear nut on mine but I don't pull in 5th if I have to use more than 20psi of boost. I will go the same route leadfoot went when my trans has a problem. It if very beefy. The gear is a press fit on the splines and uses 3 nuts.:awesomework:

For the record.............I would never put a six speed in place of my 5 spd. They have other issues and the parts to fix them are more than twice as much $$$$$$$$.:redneck: :beer:
 
One of the issues with welding onto a shaft like that could be the content of the steel itself. You don't know what the composition of the shaft or the nut is.....If I were to weld something like that I would probably try stainless rod or wire....I'm sure this isn't the only issue but I bet it adds to the problem.
 
Binder said:
One of the issues with welding onto a shaft like that could be the content of the steel itself. You don't know what the composition of the shaft or the nut is.....If I were to weld something like that I would probably try stainless rod or wire....I'm sure this isn't the only issue but I bet it adds to the problem.
Click to expand...

the owner of the shop i work at is an extremely knowledgable welder, he knows how matieral and different metals react when welding. he said it is hard to make a strong weld on harden shaft like in a transmission. the weld will almost always break of the mateiral not normaly damaging the matel.
 
when mine was welded and broke,most of the weld stayed on the nut...very little on the shaft...it broke the welds and the nut backed off...
 
I fixed my NV4500 a couple of times. Tried just the updated nut /w the setscrews and it still came loose. I did the fully splined main shaft a couple of years ago and have since sold the truck to a buddy of mine and no more issues.

John
 

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