rwfisch

So I recently purchased a used trans for my Cuda, it's a 19 spline so I assume it's a 66 or earlier. I put it in the car since I was told it was fine when I bought it. It goes in reverse okay, but in forward I have to give it gas and then it slams into gear. Once it's in gear it shifts good however if you let off of the gas it seems to fall back into neutral until you give it gas. I put a new torque converter in hoping that was it but it's not. My plans were to take it out again and rebuild with new clutches, bands and plates, but I don't know much about them and if the problem is say the accumulator or valve body or something else I don't know about, it will end up back in the car without the problem fixed. Any help is appreciated

78D200

It almost sounds like the pump is not pumping the fluid through the tranny. I could be wrong though. have you dropped the tranny pan and looked to see if there is any debris (shavings, etc.) in the fluid and pan? when you installed this tranny, did you flush out the lines and cooler? Why did you install this tranny (what was wrong with the one that was in there)?

pjmopar

I have a 65 Belvedere (727) and is acting the very same way .When i stop at a red light it seems to go into neutral .Once i bring up the rpm,s it cluncks into gear ,They tell me it must be low on fluid but its not unless i have the wrong dip stick.I have pulled the pan and it is spotless .I may have it rebuilt this fall.Sorry i wasnt any help ,but i know what your talking about.
pj

78D200

You make a good point pjmopar. Low fluid would give you the same issues. You need to make sure that the car is on level ground, running and in neutral (or park, can't remember right now) when checking the fluid level of a transmission.

Silverick

It sounds like the transmission screen filter may be dirty. It's a messy but, simple job to replace it but, I'd check this first. IMO, even if the torque converter is working and the fluid level is correct; if the filter is plugged, the converter would have to spin up to push enough fluid and pressure through the filter and then it all hits at once causing a slam/bang. Just a theory.

pjmopar

Yes that is a good theroy Silverick,and i did all that, changed filter exc.Maybe the wrong filter ,the older 727 has a pump at the front and rear i think,so it may take a different filter.just a thought
PJ

rwfisch

Thanks all for the replies. Fluid was checked on level in neutral, dropped the pan and it had shavings in it. It goes into reverse without that problem so I assume the pump isn't the issue. I already figured it needed a rebuild, I just hope it's as simple as changing the bands and clutches and not something else.

pjmopar

Hope things work out for you ,let me know what cures your problem if you can .I will know what i have to do also
PJ

rwfisch

Yes, I will. Also forgot to mention it will crawl and slowly go into gear when it's cold(like letting out a clutch) But after it's hot it just revs and then bangs into gear.

78D200

Yup.... sounds like your tranny is in need of a full rebuild. You will want to either flush out the lines and cooler or install all new lines and cooler. Also, take that new torque convertor to a tranny shop and see if they can flush it out for you as well. If you had shavings in the pan, you will have them in the torque convertor as well.

Sangetsu

The cold/warm symptoms indicate that a rebuild is probably in the works. The tranny fluid is thicker at cold temperatures, so pressure is higher. Abrupt engagement when the tranny is warm means that it is losing pressure somewhere in the system.

Fixing your transmission piecemeal will be troublesome and time consuming, and probably won't save you from eventually having to get it rebuilt properly, so you might as well get it done now and save yourself some headaches. Once it's rebuilt is should give you a couple of decades of service without worry. Get a good shift kit put into it (I love the sound of the tires chirping as the car shifts into 2nd gear), and make sure you use a reputable shop which guarantees their work.

pjmopar

Are you sure your linkage is properly adjusted ,mine did the same ,creeping ahead and i adjusted the cable and mine is okay for that part anyways,You must have linkage were my car has shift cables.
PJ

rwfisch

Yeah I was hoping it would just be linkage, but it does it even if I go into 1st.

rwfisch

Just a quick update, I did the rebuild this weekend it was pretty easy with a book to help, I didn't do anything extensive, just replaced the bands and clutches. However, the first problem I found was the accumulator spring was missing when I removed the valve body! Glad I had an extra. I'll post again after the road test.

Buffalojoe426

I may be a little late chiming in. But my 727 in the scout marks its territory every where and when it starts to get low its acts like its dropping into neutral at the lights and stop signs. Im sure it leaking out of the front main seal at the pump, but im not going to bother with fixing it in the mean time.

rwfisch

Took it for a road test today, Still doing the same thing just not as bad. I know one of the tranny lines are kinked pretty good to clear the shift linkage, I'll fix that and see what happens.

challenger

did you put a used or rebuilt converter in it and did you adjust the bands properly to spec's if you put a rebuilt vert in it and everything is adjusted right i would check your kick down linkage to make sure its adjusted properly and did you check your valve body whenyou had it apart to make sure the barrels wern't sticking since it was im sure sitting around for a while .... are you sure it was the right converter you put in it also

rwfisch

It was a new converter w/2800 stall. I put in a cable for the kickdown. It does it even if I shift to 1st manually, I adjusted the bands to spec. Never did anything with the valve body, I was thinking that also. I plan on dropping it tomorrow. Thanks

badsport

Check in neutral with it warmed up.