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#1457716 Wed Jul 06 2022 08:42 PM
Joined: Sep 2010
Posts: 1,887
W
back yard wrench turner
I have a 55 GMC 3 speed trans in my truck. It started jumping out of 3rd gear the other day. It hasn't been doing this until now.
What do I need to look at to make a determination how to repair?
Thanks


Wayne

When I die, I hope she doesn't sell everything for what I told her I paid for it!

1938 1-Ton Farm Truck
-30-
Stovebolt Gallery Forums
Wayne67vert #1457732 Wed Jul 06 2022 09:48 PM
Joined: Apr 2005
Posts: 2,013
R
'Bolter
Unfortunately it's a fairly common event with 3 speed transmissions both in the early transmissions with a torque tube and the later open driveline version. I would start with the shift linkage and make sure it fully engages and doesn't have a lot of slop.
Next check the universal joint which can cause a vibration effect and cause it to jump out of gear. It could possibly be a worn 2-3 shift fork and/or weak springs on the shift fork detent balls. Worn bearings can also cause an issue similar to the u-joint problem. And of course the good old syncronizer assembly which is a common wear part.
Or it could be a combination of all of the above.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
Wayne67vert #1457742 Wed Jul 06 2022 10:25 PM
Joined: May 2015
Posts: 6,264
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Could be the input shaft pilot bearing in the flywheel also. A worn one will allow the input shaft to be out of alignment and at a slight angle to the mainshaft which can cause the engaging clutch teeth to walk out of engagement.


Kevin
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
#2 - '29 Ford pickup restored from the ground up.
First car '29 Ford Special Coupe
Busting rust since the mid-60's
Wayne67vert #1457743 Wed Jul 06 2022 10:31 PM
Joined: Feb 2004
Posts: 25,334
H
Kettle Custodian (pot stirrer)
Do't forget to check the transmission case to bellhousing bolts for tightness. I've cured several jumping out of gear problems by simply tightening the bellhouding bolts.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!"
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Wayne67vert #1457759 Thu Jul 07 2022 12:59 AM
Joined: Mar 2002
Posts: 9,169
'Bolter
I remember years ago , having this problem. It is one of the most annoying problems that one can have.!!

Wayne67vert #1457767 Thu Jul 07 2022 01:33 AM
Joined: Apr 2005
Posts: 3,090
C
'Bolter
You don't say if it is a 55.1 or a 55.2. Either way there is a good chance the syncro drum is worn and no new ones offered. It should have an open driveshaft so it is not a hard swap to put in a fully synchronized 67 or newer 3sp trans.


Evan
Wayne67vert #1457844 Thu Jul 07 2022 05:06 PM
Joined: Mar 2010
Posts: 1,655
B
Curmudgeon
Wayne is this the same transmission with floor mount shifter from you previous post?
https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/765630/1.html


"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."
Wayne67vert #1457874 Thu Jul 07 2022 08:10 PM
Joined: Sep 2010
Posts: 1,887
W
back yard wrench turner
Yes it's the same. I'm using a Hurst shifter with it


Wayne

When I die, I hope she doesn't sell everything for what I told her I paid for it!

1938 1-Ton Farm Truck
-30-
Stovebolt Gallery Forums
Wayne67vert #1457923 Fri Jul 08 2022 02:30 AM
Joined: Mar 2010
Posts: 1,655
B
Curmudgeon
Unknown used transmissions can used transmission problems. Things you get into resurrecting old trucks.
#1 thing to check, does the transmission have lubricant or has it all leaked out?
If I remember correctly the 3 speed can have wear issues with the shift shaft bushings and synchronizers.
It wouldn't hurt to check the previous mentions and external things before going internal.


"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."

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