I too have done extensive research, and own two of them. A fully splined main shaft is the permanent fix. One of my NV4500 12 valves has the band-aid retainer nut (that I installed) and the other has a fully splined main shaft. I'll continue to run the retainer nut on the one that has it until that transmission either fails or needs to come out for another reason.
Excellent! What has your experience been with the fully splined main shaft? How many miles have you put on it? What loads did you put it through? What brand shaft is it? What type of retainer did you use on the fully splined shaft to hold the gear on?
I have not had experience yet with the fully splined shaft but have read reviews where some had eventually come loose as well. I believe that longer splines would be much better for sure. Your experience would be much appreciated!
The one with a fully splined shaft I had re-built by Standard Transmission and gear out of Ft Worth TX (link to their website below). If your interested in going that route , take a look at their website or give them call. I have never heard of professional built transmission with a fully splined main shaft having the fifth gear fall off again. They have other issues (bearings, heat and lubrication) if you overwork them, but the fifth gear stays in place with fully splined main shaft.
Excellent, thank you. How many miles on yours now?The one with a fully splined shaft I had re-built by Standard Transmission and gear out of Ft Worth TX (link to their website below). If your interested in going that route , take a look at their website or give them call. I have never heard of professional built transmission with a fully splined main shaft having the fifth gear fall off again. They have other issues (bearings, heat and lubrication) if you overwork them, but the fifth gear stays in place with fully splined main shaft.
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We stock a complete line of manual transmissions, differentials and transfer case parts & rebuilt units. Dallas / Ft. Worth in-house R&R on all differentials, Transfer Cases and Manual Transmissions. We also remove and replace clutches and flywheels. Great Service & Prices on Standard...standardtransmission.com
Mileage isn't the cause of failure, its load and torque applied. An nv4500 that has a stock engine in front of it, and that also isn't used to tow heavy in fifth gear, will last a lifetime in stock form. Put a brand new zero-mile stock nv4500 behind a high torque engine, then tow heavy in fifth gear, and it'll fail with a quickness.
I will take that excellent advice! The trans I have is a NOS one. I will go easy on it!
I lost my 5th gear, driving 70 with the cruise control on, no load when the truck had less than 100k on it. I had not started towing commercially at that time and the heaviest trailer I owned was about 10,000 pounds. I had not done a thing to the engine because it was still under warranty. Fast forward to the 11 following transmissions. None of them had a fifth gear come off, all had a fully splined shaft.
Your research is faulty and nothing you posted is true other than the design problem with the stock shaft. I doubt anyone can say for certain what the cause of the nut backing off is.
A hackneyed response.
Yet you post nonsense.
Don't forget, YOUR the idiot that emplied that "torque multiplacation" was why a 4 speed automatic could take the place of an automatic with many more gears then you went out and bought a new truck with 8 speeds. That makes you the CLOWN of the year so go back to your corner with a dunce hat on and shut up!
"nonsence" ??? YOU are the COMPLETE IDIOT that posted "torque multiplication" from a automatic transmission with only 4 gears would work as well as a transmission with many more gears for towing heavy weight and then went out and bought a new truck with 8 gears! Only a CLOWN would make a statement like that so go back to your corner and put you dunce cap on! You won the IDIOT OF THE YEAR award with that one!!! LOL!
Be sure to copy all this and paste it on your forehead! "GAmes" = 🤡
The only thing that 8 gears does better than the 3 gears in my other automatic pickup is it keeps the engine at it's most efficient rpm while accelerating and while driving. The top two gears are overdrive, the 3 speed transmission doesn't have an overdrive gear. The new one is obviously stronger, but only because there is almost 50 years of technology in my new truck. Both pickups pull my 4000 pound boat and trailer with ease. I still have the old pickup. I bought the new pickup for my wife to drive because of it's creature comforts. Regardless, that has nothing to do with an NV4500 fully splined shaft. Your red herring is moot and you don't have a clue.
Again, look at the gear ratios of the 8 speed and the 3 speed auto. Low gear is more then TWICE as low as the 3 speed. Perfect for towing, but you "bought it for your wife to drive" !!! COMPLETE IDIOT. And no the 3 speed can't even come close to the 8 speed in towing. Manufactures just add more and lower gears for no reason? Tell that non sence to a semi truck driver. If you are really that STUPID you should get out of the towing business.
Open your mouth, change feet. My old pickup has a carbureted 350 that makes about 250HP. My new Hemi is advertised at 395 HP yet both trucks pull my boat up the ramp the same. If you ever find someone who would marry you tell her she is an idiot if she wants a new vehicle. Her pickup is no more perfect for towing than mine, it just has a bigger cab, a nicer stereo, a better heater and an A/C that works.
100% COMPLETE STUPIDY! Even a kid on a bicycle knows the difference between a 3 speed and a 10 speed. But you bought a new 8 speed for "comfort". "3 gears is enough with "torque multiplication" LOL! Maybe you should let the transmission manufactures know they "only need 3 gears" IDIOT!!!
I agree full splines is better and lasts longer. I have had people tell me those failed as well at some point. The design of the splines and there length is the problem.
My '67 Chev came from the factory with a 327 and a 2 speed automatic. It has a GVWR of 7500 pounds. My '19 Ram has almost double the HP and four time as many forward gears, yet it's GVWR is only 6900 pounds. How do you explain the lower rating?
It is speculation that lugging causes the gear to come off. I know it wasn't the case when mine did.
GVWR is carying weight, not towing weight. But you wont understand that so go tell the transmission manufactures that they "really only need 2 gears" not 8 like the one you bought. IDIOT!
