Suggestion for Trans Fluid for '70 350 C20 Automatic Trans - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JimmyOzone · 06-14-2016, 05:12 PM

Hi everyone. I need to add about a pint or so of transmission fluid to my factory '70 C-20 350 V-8 automatic trans. Does anyone have any suggestions based on what works best for them? The manual says to use 'DEXRON', but I noticed there are different types of it. I was looking in the local Autozone and they have multiple options. http://www.autozone.com/motor-oil-an...smission-fluidMy vehicle is original and has about 160,000 miles. I really appreciate everyone's feedback.

BlackedOut67shorty · 06-14-2016, 05:38 PM

Dexron 3 is what i use in my th350, i used the aap brand( basically vavlaline) but any brand besides the stuff you would get at a gas station would be fine.

JimmyOzone · 06-14-2016, 06:01 PM

Quote:

Originally Posted by BlackedOut67shorty

Dexron 3 is what i use in my th350, i used the aap brand( basically vavlaline) but any brand besides the stuff you would get at a gas station would be fine.

Thanks BlackedOut67shorty

**Stocker** · 06-14-2016, 06:10 PM

I also use Dexron III. Last time I was at my local Napa store, I saw some other grade of Dexron but I don't recall what may have made it different.

**jocko** · 06-14-2016, 06:14 PM

needs to be at least a dex/merc variant - specific to GM auto trans. Note that some others are Ford/T5 only. If you check the owner's manual, it will give the the ATF equivalency specs, however the ratings have long ago been superseded. You can check to see what today's equivalent is for the original manufacturer's recommendation, but, bottom line - you just need a dex/merc type for a standard TH350/TH400.

JimmyOzone · 06-14-2016, 06:46 PM

Thanks Stocker & Jocko for your input. They didn't have a Dextron III, so I got Dextron VI for GMs which says it satisfies the requirements of III.

http://www.autozone.com/motor-oil-an...id/930140_0_0/

**Stocker** · 06-14-2016, 07:03 PM

I think you just jogged my memory.... that Dexron VI is a synthetic blend and a bit more expensive than the Dexron III that I bought. Possibly better, esp. for extreme applications.

Highlander72 · 06-15-2016, 01:38 AM

I always used Type F in my Chevy slushboxes. Slightly less slippery than Dexron.

turp mcspray · 06-15-2016, 09:37 PM

Quote:

Originally Posted by Highlander72

I always used Type F in my Chevy slushboxes. Slightly less slippery than Dexron.

x2

Harley03joe · 07-18-2016, 10:31 PM

Will This Work In My 71 C 20 350 Turbo Transmission ?
I'm Just Changing The Oil In The Pan?
Thank You For Your Input
Harley03joe

06-14-2016, 05:12 PM	#1
JimmyOzone Registered User Join Date: Aug 2014 Location: Fords, NJ Posts: 47	Suggestion for Trans Fluid for '70 350 C20 Automatic Trans Hi everyone. I need to add about a pint or so of transmission fluid to my factory '70 C-20 350 V-8 automatic trans. Does anyone have any suggestions based on what works best for them? The manual says to use 'DEXRON', but I noticed there are different types of it. I was looking in the local Autozone and they have multiple options. http://www.autozone.com/motor-oil-an...smission-fluidMy vehicle is original and has about 160,000 miles. I really appreciate everyone's feedback. __________________ You can't spell Olive without Love 1970 C-20 350 V-8 Daily Driver

06-14-2016, 05:38 PM	#2
BlackedOut67shorty Registered User Join Date: Aug 2012 Location: error 404 location not found Posts: 816	Re: Suggestion for Trans Fluid for '70 350 C20 Automatic Trans Dexron 3 is what i use in my th350, i used the aap brand( basically vavlaline) but any brand besides the stuff you would get at a gas station would be fine. __________________ 1995 s10 blazer 4.3 1967 c10 350/350 fleet short 1993 s10 blazer 4.3l 4l60 RIP 6/20/14 2000 mercury sable Thats a how I roll

06-14-2016, 06:10 PM	#4
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,599	Re: Suggestion for Trans Fluid for '70 350 C20 Automatic Trans I also use Dexron III. Last time I was at my local Napa store, I saw some other grade of Dexron but I don't recall what may have made it different. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

06-14-2016, 06:14 PM	#5
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,960	Re: Suggestion for Trans Fluid for '70 350 C20 Automatic Trans needs to be at least a dex/merc variant - specific to GM auto trans. Note that some others are Ford/T5 only. If you check the owner's manual, it will give the the ATF equivalency specs, however the ratings have long ago been superseded. You can check to see what today's equivalent is for the original manufacturer's recommendation, but, bottom line - you just need a dex/merc type for a standard TH350/TH400.

06-14-2016, 06:46 PM	#6
JimmyOzone Registered User Join Date: Aug 2014 Location: Fords, NJ Posts: 47	Re: Suggestion for Trans Fluid for '70 350 C20 Automatic Trans Thanks Stocker & Jocko for your input. They didn't have a Dextron III, so I got Dextron VI for GMs which says it satisfies the requirements of III. http://www.autozone.com/motor-oil-an...id/930140_0_0/ __________________ You can't spell Olive without Love 1970 C-20 350 V-8 Daily Driver

06-14-2016, 07:03 PM	#7
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,599	Re: Suggestion for Trans Fluid for '70 350 C20 Automatic Trans I think you just jogged my memory.... that Dexron VI is a synthetic blend and a bit more expensive than the Dexron III that I bought. Possibly better, esp. for extreme applications. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

06-15-2016, 01:38 AM	#8
Highlander72 Registered User Join Date: Aug 2011 Location: Atascadero, CA Posts: 80	Re: Suggestion for Trans Fluid for '70 350 C20 Automatic Trans I always used Type F in my Chevy slushboxes. Slightly less slippery than Dexron. __________________ '72 C10 Highlander \| '69 GTO \| '06 VFR800 \| '96 XR250

07-18-2016, 10:31 PM	#10
Harley03joe Registered User Join Date: Apr 2016 Location: Miramar Florida Posts: 153	Re: Suggestion for Trans Fluid for '70 350 C20 Automatic Trans Will This Work In My 71 C 20 350 Turbo Transmission ? I'm Just Changing The Oil In The Pan? Thank You For Your Input Harley03joe



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