Tranny up shift 2-3

[Stangman]

So took car out for the first time after surgery. Wasn’t running that great till it ran for a little while, took it for a ride adjusted carb and all was good. Took it for a couple of short rides all good. Just got back from a pretty good ride maybe 20 miles. Got home readjusted carb running mint, shut it off and one of the kids wanted to go for a ride. Start it up take off and all of a sudden it doesn’t want to shift automatically into 3rd. It’s a TCI tranny and it’s my second one that I’ve had and both of them shift 1-2 within 20 feet and into third about 50 -75 feet. Now it’s shifting into second at 75 feet and doesn’t shift into 3rd. Now I just put a new manifold on and ran a new modulator hose, which I’m pretty sure I couldn’t have burnt  a hole in it but will check of course but that would kill my back. Tranny cooler was nice and cool after the ride and it’s 80 degrees and a little humid. Could the modulator have taken a dump. This tranny only has maybe 1000 miles on it.

[Stangman]

Ok got yelled at by the wife but got under there and found modulator line off. Couldn’t get it on but tomorrow I will. Boy I don’t know about anyone else but I go right to the worst when something goes wrong all of a sudden.

[Heo]

I thought about that but i thought...Naahh he have checked that

[Drew Pojedinec]

I have a 24 hour rule on posting a problem.
I require a nights sleep and to dig back into it before I ask the masses

[Stangman]

Yeah I hear ya didn’t want to ask so fast but remember I just had surgery and I just wanted to run it by you guys. I can’t do much and figured it was the vacuum or modulator or a piece of dirt in the governor. I’m glad it was this. Thanks for answering.

[Drew Pojedinec]

I'm no transmission expert, but I don't think the gov has much to say about this low speed shifting.  Sticky governors in a c6 always left me in third gear at a stop sign.  Don't think I've ever had the higher speed weight being much an issue.

[Stangman]

How about my last tranny, at the end of a pass at the track almost as soon as you got off the gas it would downshift into second. I took off in second gear and overheated the tranny and it started right after that.

[FirstEliminator]

How about my last tranny, at the end of a pass at the track almost as soon as you got off the gas it would downshift into second. I took off in second gear and overheated the tranny and it started right after that.

  Sounds like vacuum modulator hooked up to ported vacuum for that symptom.