The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1947 - 1959 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 05-16-2017, 03:01 PM   #1
gabbin
Registered User
 
gabbin's Avatar
 
Join Date: Feb 2009
Location: harrah,oklahoma
Posts: 83
SM 420 shift pin size

Anyone know what size roll pin fits in the SM 420 shift socket, I tried to query it on here, but it didn't find anything.
gabbin is offline   Reply With Quote
Old 05-16-2017, 09:46 PM   #2
1project2many
Registered User
 
Join Date: Mar 2012
Location: Lakes Region NH
Posts: 1,776
Re: SM 420 shift pin size

Shift pin? You're talking about the pins that push into the transmission cover to keep the twist lock in place?

http://www.earlycj5.com/xf_cj5/index...ebuild.112773/
1project2many is offline   Reply With Quote
Old 05-17-2017, 08:21 AM   #3
gabbin
Registered User
 
gabbin's Avatar
 
Join Date: Feb 2009
Location: harrah,oklahoma
Posts: 83
Re: SM 420 shift pin size

Yes those are the pins I want to replace them with roll pins, the top will need drilled, so I wanted to know if anyone knows what size the inner part is, as it is just larger than where it fits in the top.
gabbin is offline   Reply With Quote
Old 05-17-2017, 11:25 AM   #4
1project2many
Registered User
 
Join Date: Mar 2012
Location: Lakes Region NH
Posts: 1,776
Re: SM 420 shift pin size

Roll pins don't usually last. Did you look at the link? It's a very creative way to solve the problem.
1project2many is offline   Reply With Quote
Old 05-17-2017, 12:07 PM   #5
gabbin
Registered User
 
gabbin's Avatar
 
Join Date: Feb 2009
Location: harrah,oklahoma
Posts: 83
Re: SM 420 shift pin size

Hardened steel roll pins will last a pretty good while, when I worked at Blumenthals trans. we used to do this to worn 420 and 465's, I just can't remember the dia. They are easily replaceable as well. I just ordered a 120pc kit on Amazon, it was 10 bucks. Should be in good shape.

This would be a great repair though for someone that has the tooling to turn some steel down to make some replacements.
gabbin is offline   Reply With Quote
Old 05-17-2017, 09:58 PM   #6
1project2many
Registered User
 
Join Date: Mar 2012
Location: Lakes Region NH
Posts: 1,776
Re: SM 420 shift pin size

Well, tooling is cool but you don't need it to make pins like those. Cut the shank off a 5/16" bolt, drill through the center, tap it for a 1/4" bolt. You can install the bolt from the outside of the cover.

I believe the pins are 1/4" in the trans cover and 5/16" on the inside. You'd have to drill the cover to 5/16" to use a roll pin.
1project2many is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump


All times are GMT -4. The time now is 08:44 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 1997-2013 67-72chevytrucks.com