Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - 1st drive with new 400sbc and powerglide trans
View Single Post
  #6 (permalink)  
Old 01-18-2013, 08:47 AM
F-BIRD'88's Avatar
F-BIRD'88 F-BIRD'88 is offline
Yada Yada Yada
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,211
Wiki Edits: 0

Thanks: 5
Thanked 389 Times in 383 Posts
If your powerglide will not auto shift at part throttle the vacuum modulator is not getting vacuum or its not connected internally. If the shift/kick down cable is not used the trans has no way of adjusting the hyd line pressure on the clutches at WOT. will tend to burn up the clutches. The "kick down" will not work either.

On a stock valve body they both need to be hooked up and functional. Go see the trans tech that built the transmission. Do not drive at WOT until you get it sorted out.
a delayed up shift at part throttle is a valve body issue or a vacuum modulator issue.

The cam in the motor and the motor itself has nothing to do with it.
Reply With Quote