Thread: Th400 trans trouble

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I have a TH400 in my Nova. It was fine last time I moved it. Now when I put it in gear it kills the engine. If I hold the "Rs" up it will go into gear but very hard. Forward is same as reverse. I didn't go far enough to see if it shifted. When you stop it has to be put into nut. or it will kill the engine... Engine 454 chevy so I don't think its a power thing may be converter????

sounds like N switch still is the rod locking the coulmn take that off

Guess I don't understand "N" switch the neutral safety switch isn't hooked up yet. the engine starts OK I just can't put it in gear with out killing the engine the only wires coming out of trans are for kick down?

gm had a steel rod that hook to the coulmn then to the tran s shifter lever.. lock out .. then to n switch in coulmn if you can not shift it the rod is out of adjustment or hiting on ex old n switch is still in the coulmn less you by past it .. was coulmn shift at one time

It is column shift but no neutral safety sw thats all been by passed for now.. The engine is not being turned off It is being boged down.

Originally Posted by cffisher

It is column shift but no neutral safety sw thats all been by passed for now.. The engine is not being turned off It is being boged down.

spool valve in trans valve body . hook to shift lever . try to go in two gears at the same time???

to me it sounds like your converter

Originally Posted by jyardgirl

to me it sounds like your converter

fast check unbolt it push it way from flywheel start it . but it going in R ??

yea I was thinking converter too, but Pat may be right. I guess I'll be spending time under the trans tomorrow. When I bolted the converter to the flywheel it spun OK (free) but that dose feel like its trying to go forward and reverse at same time

Originally Posted by cffisher

yea I was thinking converter too, but Pat may be right. I guess I'll be spending time under the trans tomorrow. When I bolted the converter to the flywheel it spun OK (free) but that dose feel like its trying to go forward and reverse at same time

it s in the valve body?? but first unhook the shifter put trans in park try to start it in park

I'll pull it out in the morning and let you know. at least I have a hoist wouldn't want to do that on my back.Thanks Pat / Barb
Think I'll put in a drain plug while pan is down

i have to look at the flow chart but one of the valves may have pick up some junk i know if the reverse feed port is pluged then it will lock trans up in low 1 .did this trans have rubber check balls in it if so one came a part ?

That could be this trans sat for about 2 years but it did work the first time...I changed the filter and gasket it wasn't dirty inside but who knows I'll see if I can find flow chart on web.

i have a 400 book some were ? see what you can find on the net if not i see if i can find it .go back and look at my post did you see what i added this trans will lock up if r port is blocked it will lock up L1 i never use paper /cloth fillter i use a sreen fillter abit hard to find but the ony way to go

The only way I'm going to find out is pull the valve body... If I remember right the filter is paper or foam inside a metal housing.... don't know about checks