a833 pops out of 3rd gear

[1970 440 RT's]

Had Hemi 4 spd 'rebuilt' not long ago.

Filled with Red Line MTL.  No grinds or anything, but seemed to come out of 3rd almost too easily, and now 'pops out' of 3rd almost all of the time, but ONLY on deceleration.  Acceleration seems to hold it, or steady power.

Already checked linkage, and the lever fully engages the 3rd gear ball detent.

Anybody know what it might need?

Thanks in advance!

[blknout]

I have the same problem with my tranny but it pops out of 2nd and then after a season of driving it started popping out of 4th also. I checked with a local rebuilder and he said it was a combo of syncros and he said something about a a gear lock also. Gear lock is not the exact name I just cant remember the exact name. This is why I am putting in a tremec

[Chryco Psycho]

it can be a problem with the syncro holding it in or worn teeth on the gear . I doubt you will be happy with the Tremec though , they shift slow & if you shift them hard & high rpm the syncros break!

[brads70]

Bell housing indicated to crank?

[1970 440 RT's]

CP, Syncros don't grind.  Does that mean it is the gear? ...or what part of the syncros need attention?

Brad, Not an expert, so not sure your question, but do you mean has the bell housing been aligned by dial indicator w.cank?
If that is your question, I do not know, but it is a stock bellhousing.

Thanks and keep the replies coming...

[brads70]

CP, Syncros don't grind.  Does that mean it is the gear? ...or what part of the syncros need attention?

Brad, Not an expert, so not sure your question, but do you mean has the bell housing been aligned by dial indicator w.cank?
If that is your question, I do not know, but it is a stock bellhousing.

Thanks and keep the replies coming...

Yep that what I meant. I don't have much experiance on Mopar 4 speeds but on circle track cars its a common issue/reason for popping out of gear? Just thought I'd throw it out there?

[73EStroker]

My past experiences with gearboxes doing the same thing has usually been worn Bearings or thrust washers worn on the countershaft. Always causes it to pop out under deceleration. Is that oil the correct specification? Or final suggestion I have is the gear selector adjusted correctly? Might not be engaging fully

[LAA66]

 Mine popped out of second on decel only. Replacing the 1-2 shift drum solved the problem.

[blknout]

I would just bring it back to who rebuilt it and show them the problem. whatever is the problem most likley its internal

[HP_Cuda]

Sounds like worn bearings, take it back to the guy who rebuilt it.

Hopefully he's on the up and up and is not reusing old parts.

Don't ask...

[resq302]

My old trans had the same issue with third gear popping out upon decelleration.  Trans shop said most likey it is the syncro's for that gear worn causing it to slip out.  Like you, I had no grinding shifting at all just it to pop out into neutral when slowing down.

[Chryco Psycho]

it can be worn keys under the outer ring that tip over & hold it into gear that are worn or weak springs under the keys allowing it to slide out , the brass rings may be fine

[LAA66]

 We replaced the sycros, bearings, aliened the trans to the bellhousing, and it still went to neutral on decel. Just my experience.

 Maybe replace the drum/slider for insurance while it's apart.

[Changin Gears]

I've seen this caused by the shifter boot being to stiff.  When you are under load, it is very difficult to shift to neutral.  But with light or no load it take very little force to go to neutral.  You could try unscrewing the boot from the floor to see if the problem goes away.

[1970 440 RT's]

Okay guys HERE IT IS...!!! 

So I paid Harry's Transmission of Denver for my first rebuild because I wanted a 'Professional job' on my Hemi 4 spd. and to start, I noticed when I first got it home that the shift cover was not installed correctly so the forks were not engaging.   An easy fix, so I just handled that part for them and installed it without making a big deal about the error.  And then, to make a long story short, it lasted about 75 miles before completely grenading. 

So I took it back to be rebuilt it under warranty, (of course I had to pull it again myself).  But when I brought it in, he was very defensive, and somehow it was my fault that 2nd gear ground from the start, 3rd gear howled, it vibrated on the highway, and it only lasted less than 100 miles before it would not go into any gear....  (This was not my first install rodeo, just admit you made a mistake on the rebuild, sheesh...)

Then when I went to pick it up after the re-rebuild, he made a comment  something like, I am not going to rebuild it again...blah blah even though he initially told me a "1 year unconditional warranty, ...It will last no problem, etc."  This told me the integrity level of Harrys Transmission...

Well anyway, since it all worked much better, no grinds, I was happy.  ...until... after a little more driving, I noticed it was popping out of 3rd under decel.  ..so I thought I would ask you all to help me diagnose since I didn't think Harrys would have the integrity to get it right on the 3rd time either and he had a bad attitude last time.

So then I pulled the trans yesterday to find that Mr. Careless had not put the strut springs in the syncros correctly, and they were only pressing on 2 of the 3 struts.  So I reinstalled them correctly myself, and VIOLA..., The trans does not pop out of 3rd anymore.

And while I had it apart, I noticed that he used used gears (was supposed to replace 3rd and coutershaft cluster gear new since they originally had a bad tooth) ...Whatever...

Well anyway, I would like to thank you all for your input, and to thank Harrys Transmission for the incompetence and lack of integrity, because it caused me to learn how to rebuild an a833 myself, and that once again, I had to do it myself if I wanted it done right.

Next time, I will just buy parts NEW from Brewers or Passon and do it myself, and I encourage the rest to do the same since the transmission was way easier than I thought it would be to work on! (although they are a little complex and you have to pay attention, so if you are not good at figuring things out, you may want to buy a whole new one from Passon or someone GOOD...lol)

Thanks again Cuda-Challenger members!