[gowser]

I installed a 350TH from 1982 Capric Classic behind 1968-327 Chevy. My problem is at 1000rpms the truck stalls when put in gear. When I increase the RPMS to keep it running the truck jumps ahead when put into gear. As far as I know the torque converter is original. Lots of help needed thanks GOWSER.

[joshp83]

if its the origional tranny from the 82 its a 350c sounds like the converter clutch is froze inside the converter or the valve in the valvebody is stuck open allowing the conveter to lock

[gowser]

Thanks josh83s. Is there any way that I can check the two things you wrote of on my own or do I need to take the tranny to tranny repair shop? Thanks GOWSER.

[joshp83]

not really if your not familar with trannys were are you located i have a tranny shop in wva

[gowser]

Thanks for getting back to me josh83. To the tranny shop I go in Windsor Ontario Canada a little closer than yours. Thanks for your help.GOWSER

[RWENUTS]

It's probably not your tranny. Sounds like carb and timing issues.
You're barkin' up the wrong tree!!!

[0trbo4myCHEVUICK]

Yeah what else have you messed with during the swap? Id hit it with a timing light for the heck of it.

[cobalt327]

Originally Posted by gowser

I installed a 350TH from 1982 Capric Classic behind 1968-327 Chevy. My problem is at 1000rpms the truck stalls when put in gear. When I increase the RPMS to keep it running the truck jumps ahead when put into gear. As far as I know the torque converter is original. Lots of help needed thanks GOWSER.

Sort the timing out first. This is especially important if the engine has a performance cam in it because if the initial timing isn't high enough, the carb primaries will be opened too far to get it to idle and that can cause the problems you're describing.

[gowser]

The truck has a Edlebrock 600cfm carb with electric choke. The timing is set at 12 degrees BTDC and it idles at 900-1000 the best. AmI in ballpark? GOWSER.

[cobalt327]

Originally Posted by gowser

The truck has a Edlebrock 600cfm carb with electric choke. The timing is set at 12 degrees BTDC and it idles at 900-1000 the best. AmI in ballpark? GOWSER.

I've not been on much so didn't see this till just now. But I'd say you probably need to do some fine tuning.

What you don't want to have happen is the mechanical advance (controlled by the weights and springs under the rotor in the distributor) to be allowing the timing to advance when it's idling at 900-1000 rpm- which is kind of high unless you have a radical cam.

If the mechanical advance is coming in at 900 rpm, when you put it into gear the timing from the mechanical advance will suddenly be lost. That- along w/the increased load on the engine from being put into gear- will often pull the idle speed down too far.

The cure isn't to add more curb idle speed, instead you would want to add initial timing.

I'll hold off until we hear back from you on possible cures. In the meantime, here is a page w/info on timing that may help you get a grasp of the subject.