The Stovebolt Page Forums Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Helping out ...


EVENTS

Check in for status!

Jump over to the Events Forum, to post events -- new ones or the ones we have been enjoying for some time.
Look to see what's been cancelled or postponed.

Encourage one another!

Stovebolt Site Search
 
Old Truck Calendars
Months of truck photos!
Nothing like an old truck calendar

Stovebolt Calendars

Check for details!


Who's Online Now
12 members (59 fleet, Denny Graham, drdoug, Goach2, AwDang, 2 invisible), 243 guests, and 4 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums50
Topics120,082
Posts961,740
Members43,550
Most Online1,229
Jan 21st, 2020
Image Posting Policy
Previous Thread
Next Thread
Print Thread
Page 1 of 2 1 2
Need help with stuck gear selectors on trans
#1307394 Wed Apr 17 2019 04:42 AM
Joined: Oct 2016
Posts: 90
E
e9coupe Offline OP
Shop Shark

'51 GMC 3100, stock engine and trans, three speed column shift. I drive the truck up and down the street today and the shifter started getting tight and wouldn't shift out of third. I limped it back to the shop in third and started taking things apart, starting with the selector box on the column. There a lot of slack between the two u-shaped cogs and the selector had squeezed past the cogs to the outside. So, that explained what happened up now the selectors on the gearbox are stuck. I drove it back in third gear so I don't know how they could both be stuck, but I'm not familiar with the gearbox. The rods are disconnected and both selectors are frozen in place. What should I do next?

Re: Need help with stuck gear selectors on trans
e9coupe #1307405 Wed Apr 17 2019 11:52 AM
Joined: Jan 2016
Posts: 668
D
Shop Shark
If you can get the vehicle in a position where there is no tension on the gears from the drive shaft you can manually move the shift selectors to the correct position. Do this with everything hooked up and on the column under the hood. Mine did this few times after I first got it. I would pop the hood, move the shifter rods to the neutral position and everything would be alright, for a while. As I said, it did it a few times when I first got it but has not done it again in the last 2 years? I am not sure what I fixed or changed that corrected the issue.

There is some additional detail in this thread.

Stuck gears

Last edited by dgrinnan; Wed Apr 17 2019 11:55 AM.

Dave from Northern Kentucky
My 54 3100
Re: Need help with stuck gear selectors on trans
e9coupe #1307415 Wed Apr 17 2019 01:46 PM
Joined: Oct 2016
Posts: 90
E
e9coupe Offline OP
Shop Shark
Thanks for the reply. I did jack up one wheel and move the driveshaft back and forth with no success. I guess I'll try lifting the whole back of the truck just to make sure and make it a two person job.

Re: Need help with stuck gear selectors on trans
e9coupe #1307431 Wed Apr 17 2019 03:52 PM
Joined: Oct 2016
Posts: 90
E
e9coupe Offline OP
Shop Shark
Assuming I get the gears to release, what's the best way to tighten the selector mechanism? Everything seems fairly good with no obvious wear on most pieces, except that the distance between the cogs allows the selector bar to squeeze between them and end up outside the "box" the cogs make. I'll add a photo later today. Can you shim behind one of the cogs/jaws to make them closer?

Re: Need help with stuck gear selectors on trans
e9coupe #1307675 Fri Apr 19 2019 04:51 AM
Joined: Oct 2016
Posts: 90
E
e9coupe Offline OP
Shop Shark
Okay, I got the gears free. I got both rear wheels off the ground and had my son move the wheel to create slack in the drive train and still couldn't get the selector to free up. Ended up taking the side cover off where the selector arms are and had to jostle the gears around quite a bit to get them loosened up. Now I need to fix the selector box tolerance.

What's the best way to tighten up the distance between the cogs so the selector can't squeeze between them and end up in the outside?


Attached Files
gear selector box markup.jpg (122.53 KB, 96 downloads)
Last edited by e9coupe; Fri Apr 19 2019 10:48 PM.
Re: Need help with stuck gear selectors on trans
e9coupe #1307870 Sat Apr 20 2019 02:02 PM
Joined: Jun 2011
Posts: 3,548
E
Shop Shark
It looks like your idea of adding a shim at the top or bottom of that shaft would work, could be just normal wear.

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.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
Re: Need help with stuck gear selectors on trans
e9coupe #1307871 Sat Apr 20 2019 02:36 PM
Joined: Jan 2013
Posts: 1,650
S
Shop Shark
If you need another column shift mechanism, low mile, good working ,pm me.
Steve

Last edited by sstock; Sat Apr 20 2019 02:37 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: Need help with stuck gear selectors on trans
e9coupe #1307903 Sat Apr 20 2019 05:59 PM
Joined: Oct 2016
Posts: 90
E
e9coupe Offline OP
Shop Shark
I installed a shim and it looks much better. Still don't know what those two plates are for. I can't find them in any other photos or diagrams


Attached Files
IMG_20190419_195340630~2.jpg (251.94 KB, 56 downloads)
Last edited by e9coupe; Sat Apr 20 2019 11:40 PM.
Re: Need help with stuck gear selectors on trans
e9coupe #1307921 Sat Apr 20 2019 08:44 PM
Joined: Apr 2005
Posts: 8,791
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
I can’t tell from your photo where the shift arms are in relation to each other. With the transmission in neutral the arms should line up perfectly with each other. If not take the rods off and turn the fittings to line up the arms. Makes shifting smoother.🛠


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2)
‘39 Dodge Businessmans Coupe
USAF 1965-69 Weather Observation Tech (got paid to look at the clouds)


"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"! Hug a cop!

Re: Need help with stuck gear selectors on trans
e9coupe #1307945 Sat Apr 20 2019 11:38 PM
Joined: Oct 2016
Posts: 90
E
e9coupe Offline OP
Shop Shark

Just drove the truck again and it works great now. I've read how you're suppose to shift the column shifter, "H" pattern and all. How I described it to my son is that you shift into gear, then shift out of gear, then shift into gear, then shift out of gear. Basically starting over each shift. That slows you down and it works good.

Kinda glad it got stuck in gear, made me fix it instead of learning how to adapt to it.

Page 1 of 2 1 2

Moderated by  SWEET 

Link Copied to Clipboard
Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Powered by UBB.threads™ PHP Forum Software 7.7.4