NP203, Which fluid to use? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

danadena1960 · 12-19-2003, 10:00 PM

Hey All,
My 77 has a NP203 with a Turbo 350, the question I have is which fluid should I run? I did the full time to part time four wheel conversion. Mile Marker says to use 10-40, the owners manual says to use 10-40, other falks I have talked to say to use ATF. When I dumped the fluid to do the conversion it was full of ATF. I was told to run ATF because if the seals go out between the trany and transfer the engine oil would wipe out the trany. I was also going to run full synthetic, but I was told the RTV I used to put the transfer case back together with is be eaten by the synthetic fluid. Does anybody have any input on this?
Thanks,
Dana

12-19-2003, 10:00 PM	#1
danadena1960 Registered User Join Date: Aug 2003 Location: Stockbridge, GA (Suburbs of Atlanta) Posts: 126	NP203, Which fluid to use? Hey All, My 77 has a NP203 with a Turbo 350, the question I have is which fluid should I run? I did the full time to part time four wheel conversion. Mile Marker says to use 10-40, the owners manual says to use 10-40, other falks I have talked to say to use ATF. When I dumped the fluid to do the conversion it was full of ATF. I was told to run ATF because if the seals go out between the trany and transfer the engine oil would wipe out the trany. I was also going to run full synthetic, but I was told the RTV I used to put the transfer case back together with is be eaten by the synthetic fluid. Does anybody have any input on this? Thanks, Dana __________________ Dana 77 K-20 454 73 SS El Camino 454 68 SS Camaro 327 48 Chevy 216 755 John Deere



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