hit the brakes hard and lost drive and reverse on 46rh
#1641990
07/04/14 06:02 PM
07/04/14 06:02 PM
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Joined: Jan 2003
Posts: 28,067
Irving, TX
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Senior Management
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Senior Management
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Posts: 28,067
Irving, TX
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A good friend has been nursing a 95 Ram 2500 CTD back to life. The transmission was glued together was what appeared to be a mix of burned motor oil residue and weasel snot. We went completely through the transmission and got it running again. Due to the contamination we fully disassembled the valve body to remove the caked on goo inside it. The two solenoids were replaced as well.
The transmission only has a handful of miles on it since the rebuild.
Yesterday, he took the truck out and everything was operating normally. He commented on it's smooth shifting. During the drive he had to brake abruptly. After that event he lost drive and reverse. The truck only runs in low and second gear now.
He's bringing it over tomorrow so we can put it in my shop and check it out.
Other than something screwy happening with the linkage what could be causing this condition?
My first thought was something in the valve body preventing the front clutch from engaging.
Where would you guys suggest looking?
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: hit the brakes hard and lost drive and reverse on 46rh
[Re: feets]
#1641994
07/04/14 09:50 PM
07/04/14 09:50 PM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Joined: Jan 2003
Posts: 27,421
Balt. Md
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Is this trans basically stock or is it modified any ? The front clutch is on in both drive and reverse so a problem in the front clutch could be cause. Reverse also needs the L/R band but you dont need the band for first in a stock trans as the overrunning clutch (sprag) will hold in first. So it would still have first in even if the L/R band had a problem but no reverse. Just off the top of my head ts seems it has a problem of the front clutch not working. I cant think of hard braking causing a problem in the front clutch ? Ron
I realize I forgot this is an overdrive trans as it could also have a problem in the overdrive unit but I cant think of what would cause both reverse and first to be lost. If the direct clutches had a problem it can cause a reverse problem but the overrunning clutch in the overdrive would hold for first to work. Did you replace the complete overdrive unit or repair it ? Ron
Last edited by 383man; 07/04/14 09:55 PM.
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Re: hit the brakes hard and lost drive and reverse on 46rh
[Re: 383man]
#1641995
07/05/14 11:44 AM
07/05/14 11:44 AM
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Joined: Jan 2003
Posts: 28,067
Irving, TX
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Irving, TX
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The transmission is a stock type rebuild. The truck is destined to be a parts runner.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: hit the brakes hard and lost drive and reverse on 46rh
[Re: feets]
#1641996
07/06/14 03:20 AM
07/06/14 03:20 AM
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Joined: Jan 2003
Posts: 28,067
Irving, TX
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Irving, TX
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We dropped the valve body for inspection. The 1-2 valve was sticking. It required a bit of effort to get that thing out. I cleaned the valve with lint free towels and scrubbed the bore with a soft bristled brush. It glides wonderfully now. The transmission has 49 miles on it since the rebuild. 14 of them were after it lost reverse and third. The fluid looked okay but there was some glitter in the pan. The magnet was a bit fuzzy but not frightening. The screens on the solenoids had collected a minor bit of stuff too. Shooting a little air into the servo ports showed good function (as expected) but should there be a reaction when lofting a bit of air pressure in the clutch ports? Being out of ideas, we buttoned it back up tonight. We'll toss in the fluid tomorrow and see if it's functioning properly. If not, we'll jack up the rear end and check pressures at the ports. Didn't think about that today until after we opened it.  Still open for suggestions on this one.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: hit the brakes hard and lost drive and reverse on 46rh
[Re: feets]
#1641997
07/06/14 03:31 PM
07/06/14 03:31 PM
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Joined: Jan 2003
Posts: 28,067
Irving, TX
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Still no go. The truck doesn't have reverse. In drive it only runs 1st gear. Manual second and first work.
He got fed up with it and threw in the towel. It's going to a transmission shop on Monday.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: hit the brakes hard and lost drive and reverse on 46rh
[Re: feets]
#1641998
07/07/14 01:10 AM
07/07/14 01:10 AM
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Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR
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I Win
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
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Quote:
Shooting a little air into the servo ports showed good function (as expected) but should there be a reaction when lofting a bit of air pressure in the clutch ports?
Some fuzz in the pan is normal , but after 49 miles ?
Putting air in the clutch ports will make the clutches apply.
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