3 Speed Saginaw - One last leak to figure out, Ugh! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Yamariv · 03-10-2023, 10:12 PM

So I've just changed my transmission oil and thought I got all the leaks by adding a new shift shaft seal and and new speedo bullit but after I put the oil back in I noticed another dang leak!! Grrr.

Does anyone know what this hole just under the fill plug is for? Please tell me it's easy to seal?

Thanks

**Palf70Step** · 03-11-2023, 09:25 AM

If I am remembering correctly, that is the drain plug.

Yamariv · 03-11-2023, 09:33 AM

Quote:

Originally Posted by Palf70Step

If I am remembering correctly, that is the drain plug.

There's no bolt though, unless it's like a counter sunk plug inside the hole? I ended up draining the fluid from the bolt just to the left of it facing the back of the truck.

Yamariv · 03-12-2023, 11:02 PM

Just a quick update, I dug into the hole today and cleaned it all out to see if there was some kind of plug or bolt. Turns out there are no threads and the hole is just cast closed. I guess some oil must have gotten in the hole when I was filling the tranny and leaked out a bit later making it appear that there was a leak coming from the hole. I'll take the easy fix! Here's a pic of the cleaned out casting hole.

Yamariv · 03-12-2023, 11:04 PM

Just realized after I posted the picture that it looks like there's a metal plug in the hole! Interesting, could that be factory or did someone add that?

03-10-2023, 10:12 PM	#1
Yamariv Registered User Join Date: Oct 2022 Location: Regina, Saskatchewan Posts: 343	3 Speed Saginaw - One last leak to figure out, Ugh! So I've just changed my transmission oil and thought I got all the leaks by adding a new shift shaft seal and and new speedo bullit but after I put the oil back in I noticed another dang leak!! Grrr. Does anyone know what this hole just under the fill plug is for? Please tell me it's easy to seal? Thanks Attached Images __________________ 1971 Chev C10 - 250ci L6 w/3 speed on the floor Upgrades: Power Steering 3 Core Radiator 7 Hole Gauge Cluster Power Brakes (Incoming!!..) 1971 350 (Incoming!!..)

03-11-2023, 09:25 AM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,268	Re: 3 Speed Saginaw - One last leak to figure out, Ugh! If I am remembering correctly, that is the drain plug. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

03-12-2023, 11:02 PM	#4
Yamariv Registered User Join Date: Oct 2022 Location: Regina, Saskatchewan Posts: 343	Re: 3 Speed Saginaw - One last leak to figure out, Ugh! Just a quick update, I dug into the hole today and cleaned it all out to see if there was some kind of plug or bolt. Turns out there are no threads and the hole is just cast closed. I guess some oil must have gotten in the hole when I was filling the tranny and leaked out a bit later making it appear that there was a leak coming from the hole. I'll take the easy fix! Here's a pic of the cleaned out casting hole. Attached Images __________________ 1971 Chev C10 - 250ci L6 w/3 speed on the floor Upgrades: Power Steering 3 Core Radiator 7 Hole Gauge Cluster Power Brakes (Incoming!!..) 1971 350 (Incoming!!..)

03-12-2023, 11:04 PM	#5
Yamariv Registered User Join Date: Oct 2022 Location: Regina, Saskatchewan Posts: 343	Re: 3 Speed Saginaw - One last leak to figure out, Ugh! Just realized after I posted the picture that it looks like there's a metal plug in the hole! Interesting, could that be factory or did someone add that? __________________ 1971 Chev C10 - 250ci L6 w/3 speed on the floor Upgrades: Power Steering 3 Core Radiator 7 Hole Gauge Cluster Power Brakes (Incoming!!..) 1971 350 (Incoming!!..)



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