1970 M20 question

Kregb

Veteran Member
Jun 25, 2009
400
Erie, CO
I purchased my car as an in process project which I will never do again. Among the many missing parts are the shifter shafts, forks and combs. I have the correct side cover but no internal parts. I can buy new forks and have seen shafts on ebay but cannot find the combs. I am also unsure of how the TCS works. Does the TCS require a specific shaft on the 3-4 side? Would probably be good to note the tranny is a Muncie M20
 

COPO

Veteran Member
Lifetime Gold Member
Sep 15, 1999
23,113
The Moon
Here's my M20 side cover. The TCS is activated by the shift mechanism in the side cover.
In order for the TCS to work you need the other components under the hood.
Like the switch at the intake, the temp switch at the pass head and the timer on the firewall
and of course the wire on the side cover switch.
The info is on my web site http://www.nastyz28.com/~copo/smog.htm

muncie_side_cover_seals_installed.JPG
muncie_new_forks2.JPG



tcs%20intake%20installed.JPG


smog_temp_sw.JPG


smog_relay.JPG
 
Last edited:

Kregb

Veteran Member
Jun 25, 2009
400
Erie, CO
COPO said:
Here's my M20 side cover. The TCS is activated by the shift mechanism in the side cover.
In order for the TCS to work you need the other components under the hood.
Like the switch at the intake, the temp switch at the pass head and the timer on the firewall
and of course the wire on the side cover switch.
The info is on my web site http://www.nastyz28.com/~copo/smog.htm

I understand this is only a part of the TCS system. What I need to know is what activates the switch. It's a ball bearing on the inside so I'm guessing the shift lever needs to have a low spot or something.
 

maguyvr

Member
Feb 25, 2015
59
Woodland,ca
I understand this is only a part of the TCS system. What I need to know is what activates the switch. It's a ball bearing on the inside so I'm guessing the shift lever needs to have a low spot or something.


This is also what I am trying to find out. Did you ever figure out what the shaft looks like that presses on the ball? Mine works backwards. It is either the wrong shaft or is indexed incorrectly, if thats even possible.
 

maguyvr

Member
Feb 25, 2015
59
Woodland,ca



I have a new switch. The problem appears to be with the 3-4 shift shaft detents where it presses on the ball. I appears to be either indexed wrong (if even possible) or the wrong shaft. I wish someone had a picture of what the shaft looks like where it presses on the ball of the switch.
 

maguyvr

Member
Feb 25, 2015
59
Woodland,ca
Manufacturer Part #: 3952649

shifter shaft 3952649 by C O P O, on Flickr


Wow! You have no idea how long I've been trying to find a picture of the shaft where it contacts the switch. Now it's all making sense. Looking through the switch hole, mine looks like a square shaft. It has obviously been apart before and someone installed a shaft for one without TCS. The only good thing is that the square part of the shaft is touching the ball but making it work backwards so I figured out how I can rewire the TCS solenoid and relay to make it work correctly.
Thank you for that picture!!
 

Attachments

  • TCS hole.jpg
    TCS hole.jpg
    36.2 KB · Views: 147




Latest posts

Top