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Transmission shifting problem #1272280
Thu Jul 12 2018 11:18 PM
Thu Jul 12 2018 11:18 PM
4
46Sparky  Offline OP
Shop Shark
Joined: Feb 2008
Posts: 869
USA
The ‘46 Chevy 1/2 Ton 3 speed transmission was rebuilt about 30 years ago by a shop used by PO. It was installed in the truck, but never used since. He passed soon after the engine and tranny were rebuilt and he’d only begun to reassemble the body. I bought the project from his widow about 8 years ago, mostly in pieces. Since then I’ve had to redo most of the previous effort. Today, I attempted to take Sparky on its first drive since the late 80’s. This is a stock rebuild.

Previous engine starts indicated the clutch needed adjustment. Despite multiple attempts at doing so the tranny cannot be shifted into gear and it grinds when attempted.

Need some ideas on where to start figuring this out. I know virtually nothing about this, but imagine that will be changing soon.

Thanks in advance.


Re: Transmission shifting problem [Re: 46Sparky] #1272282
Thu Jul 12 2018 11:41 PM
Thu Jul 12 2018 11:41 PM
J
Jon G  Offline
Shop Shark
Joined: Mar 2014
Posts: 529
Dallas, TX
It sounds to me like the clutch for some reason isn't disengaging. If you crawl under there and remove the shroud (and really there should be two but occasionally the vertical one may be missing), you can have somebody push in on the pedal while you watch and you should be able to see the pressure plate pull away from the clutch plate leaving it relatively free to move. Or another test: Can you put on the parking brake, put the transmission in first gear, push in on the clutch and then start the engine? Does it feel like the truck wants to travel? Important note: be ready to kill the engine if the truck starts moving. This is the least safe of the two options I've given you. There may be others, but at any rate I would say your clutch isn't letting go...

I've rebuilt these transmissions, too. They were very simple gearboxes compared to some later ones. Usually I found problems with first gear (people impatiently trying to force it into gear coming back from second gear or using first as a downhill engine brake...that always caused odd gear wear patterns and ruined rollers), always with the roller bearings, sometimes with reverse and that was about it. First was not synchronized as you probably remember but if the clutch lets go, it will usually go into first without trouble. Going into second before putting it in first will usually stop things from spinning as much.
Jon


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Transmission shifting problem [Re: 46Sparky] #1272283
Thu Jul 12 2018 11:44 PM
Thu Jul 12 2018 11:44 PM
Justhorsenround  Offline
Grease Monkey
Joined: Apr 2005
Posts: 6,121
Central, Oklahoma
Will it go in gear w/o the motor running? If it does you may have a clutch disk rusted to the flywheel so it won’t release. Fairly easy fix if you have a helper. Let us know.

Jon posted while I was typing (one finger method). But, what he said.

Last edited by Justhorsenround; Thu Jul 12 2018 11:47 PM.

Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line" and lock up those on the wrong side of that line.

Re: Transmission shifting problem [Re: 46Sparky] #1272292
Fri Jul 13 2018 12:58 AM
Fri Jul 13 2018 12:58 AM
4
46Sparky  Offline OP
Shop Shark
Joined: Feb 2008
Posts: 869
USA
Thanks guys!
I’ll give Jon’s suggestions a shot.
It will shift gears without the engine running. Is there a simple way to test the rust option?


Re: Transmission shifting problem [Re: 46Sparky] #1272294
Fri Jul 13 2018 01:42 AM
Fri Jul 13 2018 01:42 AM
Justhorsenround  Offline
Grease Monkey
Joined: Apr 2005
Posts: 6,121
Central, Oklahoma
With the engine off put it in 2nd and push in on the clutch as you push the starter down. If the truck tries to move forward the plate is stuck to the flywheel.

Key off, you don’t want it to start.

Last edited by Justhorsenround; Fri Jul 13 2018 01:46 AM.

Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line" and lock up those on the wrong side of that line.

Re: Transmission shifting problem [Re: 46Sparky] #1272295
Fri Jul 13 2018 01:50 AM
Fri Jul 13 2018 01:50 AM
J
Jon G  Offline
Shop Shark
Joined: Mar 2014
Posts: 529
Dallas, TX
Ah thanks Martin. I did away with my foot starter decades ago and don't think about that possibility.
Jon


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Transmission shifting problem [Re: 46Sparky] #1272298
Fri Jul 13 2018 02:38 AM
Fri Jul 13 2018 02:38 AM
S
Santerre  Offline
Wrench Fetcher
Joined: May 2018
Posts: 52
East Hawkesbury, Ontario
Like said, clutch disc stuck to plate or flywheel, can also be a stuck pilot bearing / bushing.... Or non-maching components?
J. F.


J. F.
Re: Transmission shifting problem [Re: 46Sparky] #1272331
Fri Jul 13 2018 01:42 PM
Fri Jul 13 2018 01:42 PM
4
46Sparky  Offline OP
Shop Shark
Joined: Feb 2008
Posts: 869
USA
Thanks again guys. It might be a few days before I can get back on this task. Grandkids Storm and fun about to hit land for the weekend!

Re: Transmission shifting problem [Re: 46Sparky] #1272336
Fri Jul 13 2018 02:01 PM
Fri Jul 13 2018 02:01 PM
Justhorsenround  Offline
Grease Monkey
Joined: Apr 2005
Posts: 6,121
Central, Oklahoma
Lee check your PMs


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line" and lock up those on the wrong side of that line.

Re: Transmission shifting problem [Re: 46Sparky] #1272468
Sat Jul 14 2018 01:40 PM
Sat Jul 14 2018 01:40 PM
E
EdPruss  Offline
Shop Shark
Joined: Jun 2011
Posts: 2,351
Longmont, CO
Rusted clutch discs are frequently broken loose by driving in high gear. Need to remember how to shift w/o useing the clutch, start in low gear and proceed.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'52 GMC 630 w/ 603 gasser, ex fire truck.
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