C6 won't shift - 460 Ford Forum
Driveline Discuss Driveline & Related Components.

User Tag List

 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 10 (permalink) Old 03-14-2019, 04:13 PM Thread Starter
Junior Member
 
Robert Peak's Avatar
 
Join Date: Mar 2019
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
C6 won't shift

Hello to all new to this forum, have been to nearly ALL forums where C6 is discussed and still doon't have an answer to my problem, either no one responds or they give stupid answers!!
So here is the problem, when I have the engine running and I shift down into low, it will shift up to 2nd gear but thats it, to get in drive or back to PRN I have to shut the engine off. If I'm driving along and shift down to 2nd it will not go back to Drive. Now this will happen with the shifter hooked up or compeletly unhook from the trans. So I know its not a shifter problem and no the motor mounts are not broke. No transmission repair shops have been of any help either. Please help.

If this problem sound a bit far fetch, I know, but its for real. Thanks

Robert
Robert Peak is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 03-15-2019, 04:09 AM
Senior Member
 
Join Date: Jan 2006
Location: Australia
Posts: 2,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 42 Post(s)
 
What is the history on the trans ? What is done to it ?

Is the modulator valve in right? Modulator connected to full vacuum? Modulator pin preload checked ? If the modulator you are sure is all in right and functioning it'd have to be a valvebody issue
gregaust is offline  
post #3 of 10 (permalink) Old 03-15-2019, 07:15 AM Thread Starter
Junior Member
 
Robert Peak's Avatar
 
Join Date: Mar 2019
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
Quote:
Originally Posted by gregaust View Post
What is the history on the trans ? What is done to it ?

Is the modulator valve in right? Modulator connected to full vacuum? Modulator pin preload checked ? If the modulator you are sure is all in right and functioning it'd have to be a valvebody issue
History; I bought the trans nearly 20 years ago, was still in the original car it came in. I installed it in my 63 F100 with a 390 FE.

Whats done to it; As far as I know it stock,
Its been to several shops since then and as far as I know the modulator is in correct, not sure on the pin preload check. If its something I can check with my limited knowledge I will.

Some more on the problem, a couple years back the wife bought me a B&M shifter, I installed this and shifted into low with it and started to shift back up when it wouldn't move, needless to say I put so much pressure on the shifter that it destroyed the cable. It shifts out perfect when taking off in Drive.

Last year I put it up on the rack and had a buddy sit in it while I tried to shift from underneath, I put a cheater bar on the trans shifter arm, when I saw the arm starting to bend I stopped.

I know very little about transmissions, but to me it feels like that what ever it is is very solid. .

EDIT; I have two valve bodies that I have used, does not seem to have any change to the problem.

Robert

Last edited by Robert Peak; 03-15-2019 at 07:24 AM. Reason: new info added
Robert Peak is offline  
 
post #4 of 10 (permalink) Old 03-15-2019, 08:06 AM
Senior Member
 
Join Date: Sep 2011
Location: Sioux City,Ia
Posts: 461
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 97 Post(s)
 
Robert....cable snapped,cheater bar...go a little easier,my friend! Next thing will be a bigger hammer. So,when you shift to low or 2nd,are you saying when you put it in D it doesn't shift or it physically won't go to the D position?
thermod is offline  
post #5 of 10 (permalink) Old 03-15-2019, 08:20 AM Thread Starter
Junior Member
 
Robert Peak's Avatar
 
Join Date: Mar 2019
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
Quote:
Originally Posted by thermod View Post
Robert....cable snapped,cheater bar...go a little easier,my friend! Next thing will be a bigger hammer. So,when you shift to low or 2nd,are you saying when you put it in D it doesn't shift or it physically won't go to the D position?
Yeah, I sometimes get carried away, or should be... But yes, the trans will not shift into drive or any thing above drive.PRN. physically or otherwise.
Is there something inside the trans that would be moving into a position that would block the manual valve from moving when the engine is running? Like I said above its the same with two different valve bodies.

Robert
Robert Peak is offline  
post #6 of 10 (permalink) Old 03-16-2019, 01:48 AM
Senior Member
 
Join Date: Jan 2006
Location: Australia
Posts: 2,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 42 Post(s)
 
Ah ok , I understand now .. You can move the manual lever ok stopped , but engine running it's stiff?

Is the valvebody detent in the valvebody itself , early type? Or later type with the detent roller and spring in the case?

You could check line pressure , that'd be the only thing that might make the manual valve stiff but in saying that a lot of valvebodies run up near 200 psi and no issues .
gregaust is offline  
post #7 of 10 (permalink) Old 03-16-2019, 07:48 AM Thread Starter
Junior Member
 
Robert Peak's Avatar
 
Join Date: Mar 2019
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
Right, but stiff is not quite right, stuck would be closer. I have both valve body types and it does it with both. I don't know how much it would take to move the manual lever but like I said, not even with the help of the cheater bar could I get it to move. Thanks
Robert Peak is offline  
post #8 of 10 (permalink) Old 03-16-2019, 08:02 AM
Senior Member
 
Join Date: Sep 2011
Location: Sioux City,Ia
Posts: 461
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 97 Post(s)
 
Did you check out the park pawl,park rod or the park linkage? That's about the only thing I can think of at the moment.
thermod is offline  
post #9 of 10 (permalink) Old 03-16-2019, 08:12 AM Thread Starter
Junior Member
 
Robert Peak's Avatar
 
Join Date: Mar 2019
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
You know what, I just signed back on to edit my post above to ask about the rod. Was looking at the shop manual and was studying that area, that would seem to be the only thing that is connected to the shifter that would be a solid connection. If it wasn't for the fact that this trans has performed perfect when driving normal I would have replaced it, living with the shift problem has been annoying but nothing drastic. I will pull the tailhousing and see if anything looks out of place, or maybe has some markings that don't look right. Will get back with my findings. Thanks for the help..
Robert Peak is offline  
post #10 of 10 (permalink) Old 03-17-2019, 02:03 AM
Senior Member
 
Join Date: Jan 2006
Location: Australia
Posts: 2,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 42 Post(s)
 
You can see most of the park linkage with the pan off . It might well be something there .. Could be the park linkage hitting the bracket that it is guided through

What I was getting at with the detents was that it didn't have both the detent spring in the case plus the detent in the valvebody fighting each other ..
Attached Images
File Type: jpg DSCN2139.jpg (96.5 KB, 16 views)
File Type: jpg DSCN2146.jpg (95.0 KB, 14 views)
File Type: jpg DSCN1549.jpg (92.7 KB, 16 views)
gregaust is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the 460 Ford 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:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


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

Email Address:
OR

Log-in










Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
C6 b&m shift improver, no 1-2 shift on wot slpr74f250 Driveline 7 06-14-2017 03:12 AM
C6 Won't Manually Shift to Second monte1go Driveline 29 03-19-2010 01:20 PM
c6 trans won't shift when kickdown is connected nickbay General Tech 16 12-31-2009 09:21 AM
C6 Won't shift from 2-3 keith9350 General Tech 3 12-03-2009 06:37 PM
we won we won!!! bigblockdan Chilly's Garage 11 07-21-2009 07:31 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