Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks



Visit the new site at vcca.org

Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Feb 2017
Posts: 135
Shade Tree Mechanic
OP Offline
Shade Tree Mechanic
Joined: Feb 2017
Posts: 135
I'm trying to correct oil leaking from the sift linkage side of my 3 speed trans in my 40, which I could see steadily leaking from the shift lever cover plate where it attaches to the trans after every drive. The cover plate and shift assembly were removed to replace the gasket between it and the trans, and also replace the shift shaft seals in the process while it is on the bench.

After removing the trans shift lever cover plate and shift assembly, only my larger 5/8-inch diameter shaft has seals. The smaller diameter 5/16 shaft (the bell crank shaft) has no seals like the larger shaft, which seems strange. Any experience or suggestions on what might be done to address oil that might be leaking from the smaller shaft, although no obvious wear on shaft or cover plate bore? Is it correct that 40s 3 speed trans were only manufactured with seals on the large diameter shaft and not the smaller shaft? And why it would be designed that way? I'm wondering if this is a problem to be addressed and, if so, ow best to go about it. Thanks for any advice, Bob

40ragtop


40ragtop
Filling Station - Chevrolet & GMC Reproduction Parts


Filling Station


Joined: Dec 2007
Posts: 4,024
Likes: 99
ChatMaster - 4,000
Offline
ChatMaster - 4,000
Joined: Dec 2007
Posts: 4,024
Likes: 99
Either the shop manual or the Master Parts list might answer the question about the seal on the smaller shaft.

One solution might be to slide an o-ting on the smaller shaft when you re-install it into the cover. Make sure that the transmission is not overfilled.


Rusty

VCCA #44680
Joined: Jan 2002
Posts: 30,701
Likes: 141
ChatMaster - 25,000
Offline
ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701
Likes: 141
It is correct to have the only on seaql and there is no seal on the smaller shaft. It must never had been a problem as I have never seen mention of it before. Per haps your cas or the fork is excessivly worn,


Gene Schneider
Joined: Feb 2017
Posts: 135
Shade Tree Mechanic
OP Offline
Shade Tree Mechanic
Joined: Feb 2017
Posts: 135
Gene/Rusty, thanks as always for your input. Good to know the small shaft did originally have a seal.....and I'll explore the o-ring idea. Regards.


40ragtop

Link Copied to Clipboard
 

Notice: Any comments posted herein do not necessarily reflect the official position of the VCCA.

Powered by UBB.threads™ PHP Forum Software 7.7.5