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Author Topic: Manual Trans/ Transfer Case oil  (Read 9430 times)

Offline k10Ryan79

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Manual Trans/ Transfer Case oil
« on: March 03, 2017, 08:32:48 PM »
I have a 1979 Chevy K10 with the manual trans and the 205 transfer case. what oil would you guys recommend running in them? thanks! 
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Offline 1967KaiserM715

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  • 1985 GMC K1500 w/ 6.5 TD
Re: Manual Trans/ Transfer Case oil
« Reply #1 on: March 03, 2017, 09:01:31 PM »
80w90 or 75w90 gear oil for transmission,

For the 205, I am pretty sure gm started using atf in them around the late 70's, but you won't go wrong using the same oil as the transmission.


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Current Vehicles:1985 GMC K10(Daily) 1991 GMC K2500(Daily) 1975 Beetle(not running) 1985 Mercedes 300D(not running) 1952 M35    1967 M715(not running)
 1986 Chevy K30(under repair)

Offline Sprinkler-Man

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  • 80 GMC Sierra Classic 4x4
Re: Manual Trans/ Transfer Case oil
« Reply #2 on: March 06, 2017, 08:59:47 PM »
Don't use ATF in the 205. The bolt holes thread completely into the case and the fluid leaks out. I made this mistake with my 1980 NP 205
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Offline Big Daddy

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Re: Manual Trans/ Transfer Case oil
« Reply #3 on: March 16, 2017, 05:27:27 PM »
pretty sure its gear oil in the np205, trans fluid in the np208, 10w30 in the np203
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Offline 1967KaiserM715

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  • 1985 GMC K1500 w/ 6.5 TD
Re: Manual Trans/ Transfer Case oil
« Reply #4 on: March 17, 2017, 07:14:15 AM »
So GM put syncros in the 205 in the late 80's and used ATF from the factory, not late 70's. There is a little info regarding this scattered across the interwebs if your so inclined to search for it. Iirc it was '88-'91 in the 1 tons only for shift on the fly.


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Current Vehicles:1985 GMC K10(Daily) 1991 GMC K2500(Daily) 1975 Beetle(not running) 1985 Mercedes 300D(not running) 1952 M35    1967 M715(not running)
 1986 Chevy K30(under repair)

Online VileZambonie

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Re: Manual Trans/ Transfer Case oil
« Reply #5 on: March 17, 2017, 10:44:16 AM »
Both call for GL-5 80W90

The 203 calls for 10w30
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