Engine/Transmission (1994 - 1998) Which 5th gear nut?

[eberga]

What is the difference between the 5th gear nuts from standard trans. and enterprise engine besides $10?

 

[Deezul1]

If it doesnt come with a fully splined main shaft it wont stay on no matter who makes it.

 

[CumminsPower98]

I think it depends on how it's installed. I don't think most dealers put them on to stay (just a guess). I know it's a big problem spot but I think if a person takes care to put it on right it will hold for many miles. I personally used the one from Standard Transmission with two setscrews. The little thing of loctite that comes with the nut is not near enough to do it right. Here is how I did mine.



First I cleaned everything up real well with brake cleaner and air-dried it. Next I installed the gear with lots of red loctite in the splines. I then filled the threads of both the nut and the shaft with red loctite. I installed the nut and tightened it to about 375-400 ft. lbs. I would recommend 350 since mine starting to pull threads I think. I broke my 3/4" to 1/2" adapter that says max torque of 375 so that's how I know about how tight it was. I don't have a torque wrench bigger then 250 so it was a guess. After torquing it on I staked the outter lip of the nut with big punch and 4# hammer in about 12 spots. I installed the setscrews with blue loctite on them and tightened them real tight. http://www.pbase.com/mark1974/truck



I am telling you, this held very well because a few weeks ago when I pulled the transmission to upgrade to a 6-speed I tore the 5-speed down (had excessive main shaft end play) and that nut was on there in a hard way and the nut threads got destroyed as it came off. I used about a 4 foot long cheater pipe and rested my weight on it and no go. I had to bounce on it and heat the nut and still had a huge struggle. The gear was also very hard to get off from all that loctite I put in the splines. I figured it would hammer that stuff out right away since the gear was a loose fit but it didn't.



Well anyway this was just my experience and I know others here have had good success with reusing the poorly designed setup. But if you have the bucks then installing the fully splined shaft is by all means the way to go.



Sorry so long for a simple question that I did not really answer. I don't if there is a differenece in the nuts but I bet someone does.



Mark