View Single Post
Old 07-05-2020, 10:42 PM   #22
Steeveedee
Who Changed This?
 
Steeveedee's Avatar
 
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,933
Re: TH400 vacuum line

Quote:
Originally Posted by C10Nick View Post
maybe a dumb question but I'll ask anyway...

Anybody ever tried to run the line as a rubber hose from the intake manifold all the way down to the modulator at the trans? That's what I did and now she won't shift into 3rd.

Do you guys think the rubber hose the culprit? Should I switch it out for a steel tube?
Depending on how old that hose is, it is possible that it is collapsing under vacuum. That's a long run for a vacuum hose, which is why GM uses a steel line.
__________________
~Steven

'70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper

Simi Valley, CA
Steeveedee is offline   Reply With Quote