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Sudden 47rh failure... will not engage in any gear
First of all, I'm a long time lurker but first time poster. This forum is a great resource but after a couple hours searching I cannot find an answer to my problem. Maybe I'm not using the right search terms, but in any case...
1995 Ram 3500, 2wd, Auto which is actually been converted to a motorhome, weighing about 12,000lbs. It has 163,xxx miles on it.
The previous owner had the transmission professionally rebuilt (according to the records, it had an AMK rebuild assembly set + swap in a rebuilt torque converter) in 2006 with 14x,xxx miles on it. The previous owner also had a rambrake, k&n filter and a different fuel plate (I don't know what number) professionally installed.
Yesterday while on the highway at 65mph in cruise control on relatively level ground, there was a sudden dull thump/bang and the engine began to rev freely up to 3k (ie no more load on the engine). I got on the brakes and put it in neutral and then coasted into a rest area.
Once stopped the truck would not move itself in D,2,1 nor R. The engine did not deviate at all from its idle revs no matter what gear I selected. I thought at first it was stuck in neutral and the gear selector mechanism had failed. However the mechanical linkage all seemed to be working, plus I could push/roll the truck backwards when in R, N, D, 2, or 1 but not in P (ie Park seems to be working as does the selector mechanism).
I checked the fluid level/temp/color shortly after stopping (via the dipstick) and it was ok/warm(but not hot)/red. There are no apparent leaks from the trans. I let the truck cool down for 30min but there was no change when I tried to drive it again. This was the extent of my roadside diagnosis and subsequently had to get towed to a shop.
There was no indication of an impending problem. I have only had this truck a few weeks now and have put about 2000 miles on it. The only "issue" I found with it was a slight vibration/chatter in 3rd gear at about 2000 (+/- 100) rpm under load. It had this issue since I bought it. The elderly previous owner said he never noticed it until I pointed it out to him. I would avoid this vibration/chatter by flicking the o/d override on and off quickly so it would kick down a gear. I had done this a few times prior (ie within 40 miles) to the sudden failure.
I have a few days before the shop can look at it so I am trying to diagnose it myself in the meantime. My hope is that it is something simple that can be fixed without dropping the trans. My fear is that the input shaft is stripped/snapped (although, would Park work if this was the case?).
Sorry for the long read, but I wanted to be thorough.
Any thoughts on what it could be before I go to the shop and drain the trans oil? In my searching I have found others that had sort of a similar problem, but they still had reverse. I do not have reverse.
Thanks in advance.
Tag words: 47rh, automatic, transmission, tranny, auto, failure, fail, sudden, no gears, no reverse