Power Glide shifting question - Pontiac GTO Forum
User Tag List

LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 11-12-2009, 12:49 PM Thread Starter
Join Date: Oct 2009
Location: Kansas City, MO
Posts: 47
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Power Glide shifting question

I have a power glide, or at least that is what I believe. It has 14 bolt pan, vacume modulator on right hand side, and electronic kick down on left side (looking at it from the rear toward engine). I have read some of the other posts here and notice these things can be interesting to ID. It also has 2 gears. The electronic kick down is not attached. Doesn't look like it ever was, because the wire is more up by the coil and wouldn't reach that far down I don't think. The gas peddle has a 3 wire kick down on it. The connector on the engine wire harness is a reciever for a single blade and it's a round ( about half inch dia. just like the tranny blade reciever).

So what's my question? Why will it not stay in 2nd gear. It shifts well into 1st, and once I let off the gas it shifts into 2nd without any problem when going 15 - 25mph, but as soon as there is any minimal rev other than coasting, it wants to shift back to 1st, even at higher rpms and very little pressure. In fact once I get to about 40 mph, it won't stay in 2nd at all, presumably because the engine is reving to high, until I totally let off the gas. Then once I apply anything more than idle it instantly wants to down shift again.

I disconnected the vacume line thinking maybe it was somehow getting too much vacume, but that only made it worse.

I may need a rebild but I thought I'd see if there were any tricks out there. Other than this it opperates very smoothly, no grinding or vibrating or funny noises.Thanks for the read.
67lemans is offline  
Sponsored Links
post #2 of 5 (permalink) Old 11-12-2009, 05:43 PM
FastFrank's Avatar
Join Date: Jun 2009
Location: Colfax, WA
Posts: 351
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm unsure if I can be any help to you with this. And I don't know how Pontiac did it. But I used to have a 66 Chevelle with a powerglide transmission. the kickdown for it was mechanical, and it was attached to the throttle arm on the carb. Are you sure your kickdown is electronic? What year is your car that you're talking about?
FastFrank is offline  
post #3 of 5 (permalink) Old 11-12-2009, 08:34 PM Thread Starter
Join Date: Oct 2009
Location: Kansas City, MO
Posts: 47
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It is a 1967 Lemans. I came orignial with a 326 so that makes me even more sure it came with the power glide. (now it has a 70 pontiac 350). There is currently no kick down cable or electric hooked up to it, only the vacuum. I could try extending the electric kick down wire so that it reached the spade on the transmission but that doesn't seem to logical.

I had one of these in high school. I remember taking the power glide out and putting a TH 400 in it and the electric kick down and vacuum was all it had. Any suggestions are welcome.
67lemans is offline  
post #4 of 5 (permalink) Old 11-12-2009, 08:52 PM
05GTO's Avatar
Join Date: Oct 2004
Location: Deliverance, GA
Posts: 5,132
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
The tranny should be a Super Turbine 300, I would suggest a rebuild and replace the vacuum modulator. Then connect the kick down wire, adjust the kick down switch and check for vacuum leaks.


05GTO is online now  
post #5 of 5 (permalink) Old 11-12-2009, 09:31 PM Thread Starter
Join Date: Oct 2009
Location: Kansas City, MO
Posts: 47
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I looked it up and that is exactly what it is. Thank you so much!!

Would you care to venture a guess as to whether the kick down for this transmission would work on a TH400?
67lemans is offline  
Sponsored Links

  Pontiac GTO Forum > The 2004-2006 GTO > Drive train, suspension, alignment and brakes.

Quick Reply

Register Now

In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
389/tri power + Muncie rockcrusher question Jonwilkerson 1964-1974 Tempest, Lemans & GTO General Discussion 5 11-01-2009 06:41 PM
Power Windows, Power Locks, Seat Belts, Power Rear View Mirror, Back Speaker Location GQUINCOCES 1964-1974 Tempest, Lemans & GTO Convertible Top, Interior, Glass and Trunk 2 01-03-2009 07:18 PM
65 GTO Power Steering Rag Joint Question WideTrack 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion 0 07-23-2008 08:09 PM
power brakes question wytnyt 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring 3 06-24-2008 09:13 PM
power shifting??? kanibal Racing and Kill Forum 14 06-12-2006 02:50 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome