700R4 ATF Fluid Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Zonaman** · 02-03-2022, 05:36 PM

Had some work done on my 69 C10 with the 700r4 transmission. Had to disconnect auxiliary cooler hoses and needed to replace about a quart of fluid. Accidentally used Valvoline synthetic ATF-4 instead of Dexron type. Is that going be a problem? Thanks

leftybass209 · 02-03-2022, 05:49 PM

Someone may have a more technical response, but typically as long as the fluids mix, IE: combine instead of separate like oil and water, then it shouldn't be much of an issue.

This would be more of a viscosity issue than anything I would imagine.

Now, there's a silicone brake fluid that isn't compatible with other types, and also a type of coolant that similarly can't be mixed under any circumstance, but i don't think that's the issue here with the trans fluid.

jimijam00 · 02-03-2022, 06:40 PM

I would do a complete flush with new AFT if it were my 700R4.

Are you going to kill it if left alone? Probably not given that you've got a 12 quart system with the cooler, and maybe even more if you've got a deep pan.

The additive package is probably the biggest difference between the two ATFs you have in there now.

**kwmech** · 02-03-2022, 08:03 PM

Won't hurt a thing

Bigdav160 · 02-04-2022, 10:23 AM

ATF+4 is a friction modified ATF. It's what most modern autotrans use. One quart is only 1/12th the 700R4 capacity. As kwmech said (the trans won't even notice)

02-03-2022, 05:36 PM	#1
Zonaman Senior Member Join Date: May 2004 Location: Chandler, AZ Posts: 515	700R4 ATF Fluid Question Had some work done on my 69 C10 with the 700r4 transmission. Had to disconnect auxiliary cooler hoses and needed to replace about a quart of fluid. Accidentally used Valvoline synthetic ATF-4 instead of Dexron type. Is that going be a problem? Thanks __________________ 69 C-10 LWB, 350, 700r4, 3.73 posi-traction, front disc brakes. Built for the desert- She can take the heat! Vivat Rex Chevus!

02-03-2022, 05:49 PM	#2
leftybass209 Registered User Join Date: Feb 2011 Location: Modesto, CA Posts: 2,186	Re: 700R4 ATF Fluid Question Someone may have a more technical response, but typically as long as the fluids mix, IE: combine instead of separate like oil and water, then it shouldn't be much of an issue. This would be more of a viscosity issue than anything I would imagine. Now, there's a silicone brake fluid that isn't compatible with other types, and also a type of coolant that similarly can't be mixed under any circumstance, but i don't think that's the issue here with the trans fluid.

02-03-2022, 06:40 PM	#3
jimijam00 Registered User Join Date: Apr 2009 Location: PNW Posts: 553	Re: 700R4 ATF Fluid Question I would do a complete flush with new AFT if it were my 700R4. Are you going to kill it if left alone? Probably not given that you've got a 12 quart system with the cooler, and maybe even more if you've got a deep pan. The additive package is probably the biggest difference between the two ATFs you have in there now.

02-03-2022, 08:03 PM	#4
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,413	Re: 700R4 ATF Fluid Question Won't hurt a thing

02-04-2022, 10:23 AM	#5
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	Re: 700R4 ATF Fluid Question ATF+4 is a friction modified ATF. It's what most modern autotrans use. One quart is only 1/12th the 700R4 capacity. As kwmech said (the trans won't even notice) __________________ My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe



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