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Originally Posted by Alberto
So what failed was it the coupler between the 2 shafts
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No sir. There was nothing wrong with the sleeve. In the end there wasn’t a smoking gun found as to why 5th gear started rattling on the mainshaft. I really had it burned in my brain that the AA collar that holds 5th gear in place did not hold 5th gear tight enough where it came loose and caused 5th gear to knurle the mainshaft resulting in all of the noise. Keep in mind the AA kit required the mainshaft to be cut where the nut (yeah, the one that is notorious for coming loose on NV4500s) that holds 5th gear is not used. Instead of the nut, AA uses a collar to hold 5th gear in place. That is where the 31 spline comes in.
Last year when I go it apart I found the AA collar was indeed tight where by hand it felt like it was holding 5th gear just fine. There was no play what so ever eventhough 5th gear would rock on the mainshaft. With that, I cannot blame the AA kit for taking out 5th gear on this new trans (this was a NOS trans, not a remain). Prior to tearing it apart I had already purchased a new mainshaft and round pattern 205 to go back together with as I didn’t want to cut another mainshaft.
The question remains why did 5th gear tear up the mainshaft when it was tight? That is a good question but I am starting to believe those that claim never to tow in 5th gear. I don’t tow but this truck is very heavy (8,000 lbs.) with a high torque engine. I tend to lug it in 5th gear at low RPM and low speeds just because the engine has enough power to do that. Lugging it around also saves fuel. It could the NV4500 is not strong enough for my driving habits. If this thing craps another 5th gear I’ll be looking at doing something different for a transmission. Probably an Allison 2200 on the next swap if these NV4500s continue to be so finicky.
What really chaps my butt is the trans that ate 5th gear was a NOS trans from a GM overstock buyer. That thing shifted soooo nice! Now that it has been rebuilt with an aftermarket mainshaft the SOB does not like to go in to granny gear without a fight meanwhile, the NV4500 in my Burb also has an aftermarket mainshaft and that one won’t go into 5th gear without a fist fight either. I am just about over these finicky NV4500s.
So far I've got about 5,000 miles on this latest NV4500 and so far so good (other than it doesn't like to go into granny gear). Its as quiet as a church mouse in 5th gear cruising on the interstate at 80 MPH.
[quote=SunSoaked;6846322]
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Originally Posted by DirtyLarry says "Funny, there is always this “guy” or “some website” that sells these elusive new round pattern 205 cases. Steve talked about those years ago and when I was ready to buy nobody could come up with the source that sold them. :lol:
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Pirate 4x4, his username is "gearedfather", (Member # 165627) lives in the Twin City area. Look him up, send him a PM. He never advertised, just always answered if someone was looking. Nice guy.
Larry, I'm not seeing the humor, It's a big world, all you gotta do is ask  |
Thanks for the info. It is humorous if you followed this thread for the past 4 years and lived through the PMs on this topic as well. It is funny that someone always knows a guy or something that peddles new round pattern cases for cheap. You are the first to actually come up with a name. Don't get your panties in a whad. Its all in good fun
