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Play in SM420 Shifter 1947 3100
#1364437 Thu Jun 11 2020 12:24 PM
Joined: Dec 2019
Posts: 34
4
Wrench Fetcher
Hello. I looked back at some old posts about this issue and see where some play in these shifters is normal but I am not sure if mine is above normal. The shifter moves about 5-6 inches left to right in neutral and 3-3.5 inches when in any of the gears. The pins that hold the shifter cap has play in them. I have nothing to compare them to so not sure if that's normal of it they could be an issue. Any help on this would be appreciated.


1947 3100
Re: Play in SM420 Shifter 1947 3100
47chevySC #1364450 Thu Jun 11 2020 01:54 PM
Joined: Jan 2013
Posts: 1,662
S
Shop Shark
If the shifter lugs are worn then yes it is going to seem really loose.
Worn lugs are really common on these old transmissions


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: Play in SM420 Shifter 1947 3100
47chevySC #1364522 Fri Jun 12 2020 01:11 AM
Joined: Jan 2002
Posts: 2,096
C
Shop Shark
I just went out and did a quick measure of my SM420 in the '50 and on an average I got 2" slop when in gear and 4" when in neutral. No idea if this is correct or not.


Craig's '50 Chevy 3100 5 window
My truck
If I'm not working on my truck or VW camper, I'm fishing with the wife or smoking Salmon.
Re: Play in SM420 Shifter 1947 3100
47chevySC #1364541 Fri Jun 12 2020 02:53 AM
Joined: Apr 2008
Posts: 794
F
Shop Shark
49 3100. I measure 3" in neutral and approx 3/4" in other gears. Seem to recall replacincing the pins many years ago but don't recall where I got them from.


Ed
Re: Play in SM420 Shifter 1947 3100
47chevySC #1364542 Fri Jun 12 2020 03:01 AM
Joined: Apr 2008
Posts: 794
F
Shop Shark
Google SM420 shift tower pins and you'll find many opinions and possible fixes. Good luck


Ed
Re: Play in SM420 Shifter 1947 3100
47chevySC #1364579 Fri Jun 12 2020 11:25 AM
Joined: Dec 2019
Posts: 34
4
Wrench Fetcher
Thanks for the info. It does look like the tower pins need to be replaced but do not see the pins listed anywhere. Does no one not make these? Is the spring pin the only option?


1947 3100
Re: Play in SM420 Shifter 1947 3100
47chevySC #1364581 Fri Jun 12 2020 12:17 PM
Joined: Jan 2013
Posts: 1,662
S
Shop Shark
I have a couple extra lugs/pins I could send you, also have a really nice shifter top depending on whether you have the e brake on the trans.
I have actually had better luck knocking out the loose lugs and drilling out the tower to accept a slightly larger hardened spring pin boy that really tightened up things.
Steve

Last edited by sstock; Fri Jun 12 2020 12:21 PM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: Play in SM420 Shifter 1947 3100
47chevySC #1364584 Fri Jun 12 2020 01:35 PM
Joined: Dec 2019
Posts: 34
4
Wrench Fetcher
Hi Steve. Thanks for the info. Would those pins usually be available at the hardware store? Do by chance know what size they are?


1947 3100

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