you could alway do what im doin. i bought an updated mainshaft that is fully splined and has the correct spline pattern and uses a split key washer to take all the thrust load off the nut so it wont rock it back and forth on off. it also has the brass set screw style nut to for extra insurance. its about 400 dollars to have it put in by out local standard tranny mechanic. he also replaces the bearings and syncros while hes in there. im havin him do mine next week when i pull my tranny out for the new clutch install. Just make sure whoever does your trannys knows what he is doing.

i dont know how involved i should get with it in lew of what my plans are. After i perform the upgrades to the vehicle, it will most likely have a utility bed on it. Thats the plan anyways. So it probably wont be towing much. I will just have to see how that works out. However none of the trannys that have been in it have had updated nuts on fifth gear. I walked out to my bonyard and looked at them. So maybe it will be sufficient with the updated stuff to keep fifth on the shaft and not rollin around behind it. I remember my first time of 5th falling off, like wtf just happened. being the curious person i am i had the tear it apart. When i found 5th sitting therre and the nut right behind it i couldn't believe it. I put it back on with my fingers and it just went right back on. Again wtf just happened occured. So i tightened it down and was like cool. next time i learned to tack it. nope weld the #@$%^& out of it. Now were old hands at it. Easy and quick. Not a problem. Funny how tings work out.

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now i am having problems with the fuel shutoff soleniod, which wires are supposed to be what voltage coming into that thing. It does not engage when you turn the key on. you go over there and pull it up it sticks. turn the key off it falls and turn the key on again and start all over.

I don't recommend welding the nut on anytime you weld something that has been heat treated you run the risk of weakening it to the point of breaking. I lost my fifth gear a few months back and have just now gotten my new nut now I need to figure out how to get it tight enough. I wish I had the money for a full splined main.