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Jul 21st, 2025 | | | | Joined: Oct 2010 Posts: 45 'Bolter | | 'Bolter Joined: Oct 2010 Posts: 45 | Hi
I have a 49 3600 with a 4 speed I'm Assuming it is a SM420
I have a weird problem while driving the truck today I came up to a stop the clutch didn't disengage when I pushed the clutch it only happens some times, other times it works normal
Any Idea what I should look at
Thanks John
| | | | | Joined: Oct 2021 Posts: 5,684 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 5,684 | So you pushed the pedal in order to stop and the car stayed in gear, presumably stalling?
Are you able to shift out of gear or is the lever stuck in position when this happens?
How much pressure is required when you step on the clutch? easy , hard? When the clutch won't disengage does the pedal feel firm, light, same as always?
How new or old are all the cluthc components? throw out bearing pilot bearing, clutch , pressure plate, etc?
A worn throw out bearing is my first suspicion (also known as the clutch release bearing).
Last edited by Otto Skorzeny; 07/21/2022 1:24 AM.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1956 Cadillac Sixty Special Fleetwood (The Godfather) | 1966 Oldsmobile Toronado (The Purple Knif) | 1966 Ford Mustang (Little Red) | 1964 Ford Galaxie 500 coupe | 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Mar 2010 Posts: 1,659 Curmudgeon | | Curmudgeon Joined: Mar 2010 Posts: 1,659 | This is basic stuff off the top of my head. With the truck parked and engine off. Chock the wheels. Have someone push in the clutch pedal while you look at the clutch arm. If the arm doesn't move much or at all, check that the jam nut is not loose. If that looks okay and there is plenty of movement, it's internal. Take it to the repair shop. If you want to do it yourself, look here: http://chevy.oldcarmanualproject.com/shop/1948_51truck/index.htm
Last edited by buoymaker; 07/21/2022 2:56 AM.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
| | | | | Joined: Oct 2010 Posts: 45 'Bolter | | 'Bolter Joined: Oct 2010 Posts: 45 | Otto
I'm not sure about the clutch components I bought the truck last fall I have driven it about 125 miles this year
The clutch pedal pressure hasn't changed when it stuck I was able to get it out of gear I pulled it in to a parking lot with the trans in first gear and clutch in I cranked the engine and it creaped forward
I went in to the store came back out and it worked fine
It did it a few more times yesterday
I'll try and crawl underneath to see if I see any thing obvious
Thanks for the input
John
| | | | | Joined: Oct 2010 Posts: 45 'Bolter | | 'Bolter Joined: Oct 2010 Posts: 45 | Thanks bouymaker
I'll crawl underneath and see what I can see
John
| | | | | Joined: Sep 2011 Posts: 1,363 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,363 | Otto
I'm not sure about the clutch components I bought the truck last fall I have driven it about 125 miles this year
Thanks for the input
John Clutch disc sticking to flywheel or clutch pressure plate can happen when rig sits, esp. in humid area. Clutch disc spline stuck to trans input shaft splines, Pilot bushing sticking to input shaft due are a few of the thing that come to mind.
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
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