Trans disengages while coasting

[jvest]

I've got a 350 turbo in my 68 Camaro. As long as I'm in the throttle it shifts out fine and dosen't slip, but if I coast down hill(off the throttle) it seems like it disengages. When I get back in the throttle it'll jump back in gear. Has anyone got any ideas on what could be causing this?

Thanks for any help,

Jim

[HILROD]

Some times when trans get rebuilt, they cheap out and leave out the bands that do the engine braking. If this is your problem, you'll have to get it rebuilt.

[MonzaRacer]

My th 350 did that and it was the converter, gave it to a buddy and he swapped in a different converter and it would work fine.
But if its inside its probably ready for some fresh parts.
now would be good time to trade up to a built th700R4

[GetMore]

Had an old Mopar that did that. The filter was getting clogged. Replaced the filter and got another year or so out of the trans.

[jvest]

I bought the motor & trans (383 sbc w/Eagle rotating assembly)about year ago for this project from a local hot rodder that's known for sinking tons of money in his rides, so I don't think he left anything out. He built this combo for a 69 camaro that he sold after 500 miles, less motor & trans. It sit for a year before I purchased it. Until recently I've only drove the car in and out of the garage while completing a restoration.

I started a cam change this weekend and noticed the vacuum line was off the modulator. I think the modulator only controls shift points, but when I get it back together I'll give it try.

It's got a TCI 3000 stall. I was thinking from the begining it could be the convertor, but I wanted to get other opinions because I'm no trans expert. I would love to go with a 700R4 or 4L60E, but I'm budget is getting tight and I still like a vintage air kit and paint.

Thanks for your posts,
Jim

[justasquid]

I believe the 3000 stall will give you the impression you are talking about.

Why the high stall? If your not drag racing the car, wouldn't a 2000 stall be plenty for a street driver?

If your engine can handle down low rpms without falling on its face( depending on how "built" it is), I would shoot for a lower stall.

I'm no expert by any means, so take this advice with a grain of salt.

[jvest]

I believe the 3000 stall will give you the impression you are talking about.

Why the high stall? If your not drag racing the car, wouldn't a 2000 stall be plenty for a street driver?

If your engine can handle down low rpms without falling on its face( depending on how "built" it is), I would shoot for a lower stall.

I'm no expert by any means, so take this advice with a grain of salt.

You could be right on the stall. A 2500 stall is the highest stall I've run in the past. The 2500 never did anything like this one. This one is like you kick it up in neutral when you back off the throttle and when you get back in the throttle it'll delay a couple seconds then it's like you pulled it back into drive while in the throttle. I'm not sure why he used the 3000, because this combo is setup for 2500 - 6500RPM.

Thanks again for the advise,
Jim