Put TH400 back in, won't shift - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cppursell · 11-29-2010, 08:17 PM

Well, I've been creating several threads with different issues of my friends' '63 C10. It started with putting a new engine in (which is running great now, woohoo). When attaching the transmission he broke the pump, which he replaced and now the car moves, but: It won't shift out of first gear! My friend has an idea that the solenoid on the transmission for the electric kick-down might be causing it, but I haven't a clue. Can you pros help?

Thanks!

69 longhorn · 11-29-2010, 08:38 PM

do you have the vacumn line hooked up to the modulator?

cppursell · 11-29-2010, 08:54 PM

Yessir, he reports his vaccum is plugged in correctly to the intake manifold, and there is a good suction. I suspected this myself as possibly being a problem. Maybe his modulator is bad?

68 TT · 11-30-2010, 05:10 PM

Quote:

Originally Posted by cppursell

Yessir, he reports his vaccum is plugged in correctly to the intake manifold, and there is a good suction. I suspected this myself as possibly being a problem. Maybe his modulator is bad?

The kick down circuit probably wouldn't keep it from shifting. I would bet you are correct and the vacuum modulator is bad or damaged and leaking vacuum. Without it functioning the trans will not shift out of first gear.

cppursell · 12-01-2010, 04:10 AM

Okay I will let him know. Replacing the modulator is cheap anyway and wouldn't hurt.

raycow · 12-01-2010, 02:50 PM

If the modulator doesn't do it, you could look at the governor next. The symptoms are about right, but I have no clue how there could be any connection with a damaged pump. A more likely possibility might be that a small piece of debris from the pump somehow got into the valve body.

Ray

11-29-2010, 08:17 PM	#1
cppursell Registered User Join Date: Dec 2008 Location: San Francisco, CA Posts: 144	Put TH400 back in, won't shift Well, I've been creating several threads with different issues of my friends' '63 C10. It started with putting a new engine in (which is running great now, woohoo). When attaching the transmission he broke the pump, which he replaced and now the car moves, but: It won't shift out of first gear! My friend has an idea that the solenoid on the transmission for the electric kick-down might be causing it, but I haven't a clue. Can you pros help? Thanks!

11-29-2010, 08:38 PM	#2
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	Re: Put TH400 back in, won't shift do you have the vacumn line hooked up to the modulator? __________________ http://community.webshots.com/user/hotrodhorn

11-29-2010, 08:54 PM	#3
cppursell Registered User Join Date: Dec 2008 Location: San Francisco, CA Posts: 144	Re: Put TH400 back in, won't shift Yessir, he reports his vaccum is plugged in correctly to the intake manifold, and there is a good suction. I suspected this myself as possibly being a problem. Maybe his modulator is bad?

12-01-2010, 04:10 AM	#5
cppursell Registered User Join Date: Dec 2008 Location: San Francisco, CA Posts: 144	Re: Put TH400 back in, won't shift Okay I will let him know. Replacing the modulator is cheap anyway and wouldn't hurt.

12-01-2010, 02:50 PM	#6
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: Put TH400 back in, won't shift If the modulator doesn't do it, you could look at the governor next. The symptoms are about right, but I have no clue how there could be any connection with a damaged pump. A more likely possibility might be that a small piece of debris from the pump somehow got into the valve body. Ray __________________ Live more responsibly. Eat lower on the food chain. Eat vegetarians.

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