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3-speed tranny condition??
#1429517 Mon Nov 08 2021 03:04 AM
Joined: Jun 2008
Posts: 1,700
S
'Bolter
A very kind fellow ‘bolter gave me a 3-speed tranny. He told me up front he did not know it’s condition and therefore would not/could not charge me. Thank you Josh!
I cleaned it up today, then took off the side cover to take a look inside. All the gears looked good and sharp except the largest gear. The teeth look worn on both ends, and several teeth look chipped or broken a bit. I know nothing about transmissions, having never worked on one, but I figure if the teeth are rounded off then the transmission might slip when in gear. Take a look at the pics and let me know what you think. Does it look normal enough to install, or should I keep looking for a better one or have this one overhauled?
BTW, my original tranny is toast. Started jumping out of 3rd gear and now will not even go into 3rd.
Thank you!

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Chuck
1950 Chevy 1/2 ton (all original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
Re: 3-speed tranny condition??
Spotbiltxo #1429518 Mon Nov 08 2021 03:15 AM
Joined: Apr 2005
Posts: 10,671
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
That transmission has seen some hard use. Rebuild before using.


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) “Emily”
‘39 Dodge Businessmans Coupe “Clarence”



"I fought the law and the law won" now I are a retired one!
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Re: 3-speed tranny condition??
Spotbiltxo #1429520 Mon Nov 08 2021 04:17 AM
Joined: May 2015
Posts: 5,319
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
I agree with Martin.
Looks like you need a reverse idler and a first/reverse gear at a minimum. Looks like someone has been jamming it into a non-synchronized gear, resulting in chipped teeth.


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
Re: 3-speed tranny condition??
Spotbiltxo #1429542 Mon Nov 08 2021 04:01 PM
Joined: Apr 2005
Posts: 1,970
R
'Bolter
As stated those gears are seriously damaged. The cluster gear (also known as counter gear) is also damaged where the L/R slider comes in contact with it in the L position. It is likely the most expensive part in that transmission and could be difficult to obtain. It's possible that there are some useable parts like the syncro assembly that you could use in yours.
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
Re: 3-speed tranny condition??
Spotbiltxo #1429550 Mon Nov 08 2021 04:49 PM
Joined: May 2015
Posts: 5,319
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Fred is correct. I was confusing the reverse idler with the cluster gear in your photos, but the reverse idler may need to be replaced also. You may be able to get by without replacing the reverse idler, but it needs to be checked. Since you have two trannies, you may be able to swap parts between them to come up with a good tranny.


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
Re: 3-speed tranny condition??
Spotbiltxo #1429555 Mon Nov 08 2021 06:10 PM
Joined: Dec 2015
Posts: 535
D
Unconventional Thinker
Does your current transmission's gears look better than this one? Can you use parts from both make one good one?


Shane

Shane's Toys...
2007 Forester XT Limited (2nd Owner)
1991 Cherokee Laredo (2nd Owner)
1981 Chevy 3/4 Ton Fleetside 8,600 Camper Special (3rd Owner)
1965 Chevy 3/4 Ton Fleetside (3rd Owner)
Re: 3-speed tranny condition??
Spotbiltxo #1429558 Mon Nov 08 2021 07:02 PM
Joined: Feb 2000
Posts: 96
T
'Bolter
Good topic. Mine is also showing signs of wear such as jumping out of 3rd under torque. It still runs very quiet though - if that means anything. I am running a 235, but I baby it.
My brother had a 1950 1/2 ton that occasionally jumped out of 3rd and attached a bike inner tube to the floor under the shift lever and would simply reach down and slip the other end over the lever whilst in 3rd.
Worked that way for a long time. He called it a "Tennessee overdrive". I guess I have 200K miles on this one. I looked at the Chevy Assy Manual for a part number and found #3845068 for a LH 3100, but not sure that is correct for mine. Does anyone have a good part number I should look for?

Re: 3-speed tranny condition??
Spotbiltxo #1429559 Mon Nov 08 2021 07:27 PM
Joined: May 2015
Posts: 5,319
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Jumping out of 3rd is usually a synchronizer, input bearing or pilot bearing issue.

That's the part number for the entire tranny. You won't find a new one, or likely even a rebuilt one with that number. You can find part # information here: 29-54 Parts Manual [chevy.oldcarmanualproject.com]
Some of the vendors carry some transmission parts, although gears are very hard to find, and most bearings can be purchased locally with the PN on the original bearing.

Last edited by klhansen; Mon Nov 08 2021 07:41 PM.

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
Re: 3-speed tranny condition??
Spotbiltxo #1429563 Mon Nov 08 2021 08:56 PM
Joined: Feb 2000
Posts: 96
T
'Bolter
klhansen, Thank you for that link. I have not checked that out in a while. I did climb under my truck to find my tired tranny's part number: 591618. I am hoping you are correct and the synchronizer is the culprit.

Terry

Re: 3-speed tranny condition??
Spotbiltxo #1429598 Tue Nov 09 2021 02:56 AM
Joined: Jan 2008
Posts: 4,801
C
'Bolter
The number you cite is a casting number. It is probably a 591618 which was the transmission case used from 48-54. However, 53 and 54 have quite a few different gears than the 48-52. The later synchronizer has 4 logs while the older one has just two. Two lugs can be ground off and used in the older transmission. However other gears will not mix and match. I haven't built any transmissions in a long time, but if I remember correctly counting the lugs on the synchronizer is the quick way of identifying the transmission. Unless you ran your transmission out of oil, it may not be as bad as you think. Worn shift forks can cause it to jump out of third. A worn out pilot bushing will also do the same thing.

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