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04-25-2024, 12:52 AM
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#1 |
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Registered User
Join Date: Feb 2024
Location: Pleasanton CA
Posts: 232
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1969 Three on the Tree - trans fluid and capacity?
Hi guys, I have a three on the tree in my ‘69
Can anyone tell me what trans fluid it takes and rough capacity? Thanks Also, assuming it’s original, what transmission is this?
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1969 C10 Shortbed Last edited by Luke87gt; 04-25-2024 at 01:26 AM. |
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04-25-2024, 02:21 AM
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#2 |
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Registered User
 
Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,706
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Re: 1969 Three on the Tree - trans fluid and capacity?
80/90 Gear oil. I'm thinking 3-1/2 pints but will have to find my manual. If it is in the truck one of those red plastic transfer pumps with the red hoses from Harbor Freight is a life saver. They are inexpensive enough to have one for each type of fluid you would pump with one and not cross contaminate.
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Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around. |
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04-25-2024, 12:33 PM
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#3 |
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Senior Member
Join Date: Dec 1999
Location: TX
Posts: 1,623
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Re: 1969 Three on the Tree - trans fluid and capacity?
This is what I use in mine:
https://www.tractorsupply.com/tsc/pr...-2-gal-t806600 The GL-1 rating is safe bronze and copper(one or both are present in the 3 speeds) There's much discussion about this on this board and many others. But my deduction was the a GL-1 Rated 90w Gear oil is the safe choice. |
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04-25-2024, 12:34 PM
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#4 |
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Senior Member
Join Date: Dec 1999
Location: TX
Posts: 1,623
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Re: 1969 Three on the Tree - trans fluid and capacity?
Apparently NAPA has 1 gallon for the price of 2 at tractor supply if that is more convenient for you.
https://www.napaonline.com/en/p/NHF65201 |
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04-25-2024, 03:38 PM
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#5 | |
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Active Member
Join Date: Sep 2023
Location: randolph va
Posts: 158
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Re: 1969 Three on the Tree - trans fluid and capacity?
Quote:
I would go with a good 80W90 oil just my opinion David
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Old dogs and children and watermelon wine 
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04-26-2024, 03:49 PM
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#6 | |
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Registered User
Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,706
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Re: 1969 Three on the Tree - trans fluid and capacity?
Quote:
__________________
Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around. |
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04-26-2024, 05:33 PM
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#7 |
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Registered User
Join Date: Feb 2024
Location: Pleasanton CA
Posts: 232
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Re: 1969 Three on the Tree - trans fluid and capacity?
Thank you for the replies everyone.
Will use the gear oil recommended above. Lastly, what transmission brand/name is this?
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1969 C10 Shortbed |
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04-26-2024, 06:19 PM
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#8 |
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Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,597
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Re: 1969 Three on the Tree - trans fluid and capacity?
Just like a differential. Fill it until lube runs out of the fill hole.
Most gear oil bottles have a nozzle, so unless something is in the way, you can just stick in the hole and squeeze.
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Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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04-26-2024, 06:32 PM
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#9 | |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
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Re: 1969 Three on the Tree - trans fluid and capacity?
Quote:
https://lugnutz65chevystepside.weebl...ission-id.html |
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04-26-2024, 08:29 PM
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#10 | |
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Registered User
Join Date: Feb 2024
Location: Pleasanton CA
Posts: 232
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Re: 1969 Three on the Tree - trans fluid and capacity?
Quote:
Based on the 7 bolt cover, and placement of bolt holes, it appears to be a Saginaw 3sp manual Is that good or bad? Lol
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1969 C10 Shortbed |
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04-26-2024, 09:38 PM
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#11 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
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Re: 1969 Three on the Tree - trans fluid and capacity?
Good trans.
Lighter duty. The Muncie was supposedly heavy duty. |
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04-26-2024, 10:19 PM
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#12 |
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All stock and staying that way
Join Date: Jul 2003
Location: Elkland, PA
Posts: 1,827
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Re: 1969 Three on the Tree - trans fluid and capacity?
Just make sure the fluid is GL4. It's compatible with soft metals.
__________________
1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor...  2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels |
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04-26-2024, 10:57 PM
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#13 | |
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Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,597
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Re: 1969 Three on the Tree - trans fluid and capacity?
Quote:
Useless information? 
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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04-27-2024, 12:06 AM
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#14 |
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Registered User
Join Date: Feb 2024
Location: Pleasanton CA
Posts: 232
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Re: 1969 Three on the Tree - trans fluid and capacity?
Oh, can anyone confirm the three gear ratios ?
Also, what is my factory rearend gear ratio in my 12 bolt?
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1969 C10 Shortbed |
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04-27-2024, 05:27 AM
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#15 | |
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Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,504
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Re: 1969 Three on the Tree - trans fluid and capacity?
Quote:
B]...If originally equipped with an automatic transmission, a 3:08 differential gear set was installed. If Manual, 3.73 was standard. If not noted on the SPID Then it was one of these.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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04-27-2024, 10:37 AM
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#16 | |
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Registered User
Join Date: Feb 2024
Location: Pleasanton CA
Posts: 232
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Re: 1969 Three on the Tree - trans fluid and capacity?
Quote:
I’ll try to confirm it by doing the wheel rotate / driveshaft count
__________________
1969 C10 Shortbed |
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04-27-2024, 11:12 AM
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#17 |
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All stock and staying that way
Join Date: Jul 2003
Location: Elkland, PA
Posts: 1,827
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Re: 1969 Three on the Tree - trans fluid and capacity?
Factory issued info:
__________________
1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels |
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04-27-2024, 11:22 AM
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#18 |
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All stock and staying that way
Join Date: Jul 2003
Location: Elkland, PA
Posts: 1,827
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Re: 1969 Three on the Tree - trans fluid and capacity?
GL-5 80W or 90W was recommended then..
__________________
1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels |
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04-27-2024, 03:30 PM
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#19 | |
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Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,504
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Re: 1969 Three on the Tree - trans fluid and capacity?
Quote:
__________________
Every 25 years I like to rebuild that 292, whether it needs it or not. |
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