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Global Mod,
Mod | | | Forums66 Topics128,200 Posts1,057,405 Members48,471 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Oct 2009 Posts: 13 New Guy | | New Guy Joined: Oct 2009 Posts: 13 | I have a 1966 k10 that has a good leak out of the speedo cable where it treads to the transfer case. It is a rockwell t221. I removed the cable and the gear and gear sleeve and see no seal anywhere.Can someone tell me what I'm missing.
Thanks Al | | | | | Joined: Aug 2004 Posts: 1,418 ODSS Lawman | | ODSS Lawman Joined: Aug 2004 Posts: 1,418 | The seal!!
There has to be some kind of O-ring or paper seal in there to keep the oil from leaking......
SWEET Sergeant At Arms: Old Dominion Stovebolt Society BUNS?!?!?!Where we're going, we don't need no buns.....1950 GMC 450 1951 Chevy 1/2-TonThe GreenMachineIn the Stovebolt Gallery | | | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | Could the transmission be overfilled? I thought the speedo cable exited the transmission above the oil level. | | | | | Joined: Oct 2009 Posts: 13 New Guy | | New Guy Joined: Oct 2009 Posts: 13 | The transfer case is not over filled. But looking in the shop manual I have it apears that the speedo gear and cable should exit on the top side of the housing and towards the drivers side. Mine exits from the bottom and towards the passengers side. I think it might need to be spun if the 4 bolt pattern is equal. | | | | | Joined: Oct 2009 Posts: 13 New Guy | | New Guy Joined: Oct 2009 Posts: 13 | i solved my problem. i took the speedo gear housing(metal coupler threaded on both sides) and had a machinist bore a hole to fit a speedo seal from at turbo 350. works great!!!
Alstepside | | | | | Joined: Feb 2017 Posts: 10 New Guy | | New Guy Joined: Feb 2017 Posts: 10 | Hi Al,
I just came across your post. I have a '62 K10 with the exact same problem. My transfer case is leaking like a sieve, where the speedo cable connects. Mine also exits from the bottom and towards the passengers side. And there's no o-rings whatsoever. I saw that you had a machinist bore a hole (to fit a speedo seal from a turbo 350). Any advice on how to do that? Size/etc?
Thx,
Wayne
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'62 K10 Fleetside
| | | | | Joined: May 2007 Posts: 1,718 Moderator: 60-66 Trucks; North Eastern Bolters | | Moderator: 60-66 Trucks; North Eastern Bolters Joined: May 2007 Posts: 1,718 | I am also listening. Does anyone have pictures of this mod or a part number for the cable seals (if they exist)? | | |
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