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4 Speed questions #1272230
Thu Jul 12 2018 01:16 PM
Thu Jul 12 2018 01:16 PM
4
48GinPole  Offline OP
New Guy
Joined: Jun 2018
Posts: 8
Arizona
So I’ve got a ‘48 GMC 300, I’m going to need to rebuild the 4 speed as the windows were broken out and it got rained on for 60 years...
I have two questions though:
1- Is this the same 4 speed that was optional in the 1/2 ton and 3/4 ton trucks? I think they just upped the pulling/hauling power by adding a low geared 2 speed rear end, is that correct?

2- How do I identify my transmission so that I can order a rebuild kit? These early trucks all had Muncie 4 speeds right? Or am I completely wrong? I’ll have to dig through some grime to find the ID number I just want to know where to start.

Thanks in advance!


Logan
2010 Silverado 2500HD
1948 GMC 300
Re: 4 Speed questions [Re: 48GinPole] #1272234
Thu Jul 12 2018 01:41 PM
Thu Jul 12 2018 01:41 PM
3
3B  Offline
Master Gabster
Joined: Nov 2005
Posts: 5,457
B. C. Canada
Hy 48GinPole, does your transmission shift lever have a small lever and rod on the side of it? if it does you have the older sliding gear four speed, if there is no lever and rod then you should have the SM 420 transmission, this transmission was used right up to the mid sixties and was the only four speed the factory installed in their trucks, hope that helps.

Re: 4 Speed questions [Re: 48GinPole] #1272263
Thu Jul 12 2018 05:37 PM
Thu Jul 12 2018 05:37 PM
4
48GinPole  Offline OP
New Guy
Joined: Jun 2018
Posts: 8
Arizona
It does have the the small lever, what does that do? Ive never heard of that. Is it going to be hard to find a rebuild kit?


Logan
2010 Silverado 2500HD
1948 GMC 300
Re: 4 Speed questions [Re: 48GinPole] #1272268
Thu Jul 12 2018 06:53 PM
Thu Jul 12 2018 06:53 PM
3
3B  Offline
Master Gabster
Joined: Nov 2005
Posts: 5,457
B. C. Canada
Hy 48GinPole, I don't know that anyone makes a "kit" for that transmission, that is a crash box transmission (no synchronizers), I think all you could do is change the ball and needle bearings if they need replacing and check the shafts and gears for wear and damage. If that is the transmission you have, your truck is more than likely a 1947 model, as that was the last year for the sliding gear transmission, hope that helps.

Re: 4 Speed questions [Re: 48GinPole] #1272301
Fri Jul 13 2018 03:36 AM
Fri Jul 13 2018 03:36 AM
R
Rich'sToys  Offline
Shop Shark
Joined: Jul 2004
Posts: 3,182
Janesville, Mn
The small lever is a reverse lock out. You need to lift the lever to put it into reverse, which would be to the left, then back toward the seat.


Rich

'47 Loadmaster


Politicians and Lawyers have twisted everything in this country into knots that we can never unravel.


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