TH400 Fluid Capacity? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

azphillyguy · 08-08-2009, 01:30 PM

Hi -

I'm changing the tranny fluid and filter in my 72 GMC C2500 (TH400). I read in my owner's manual that I need to put 7.5 pints (about 3 3/4 quarts) of oil back in, but that didn't seem like enough when I read it, and it's not enough. That much doesn't even register on the dip stick and of course, the tranny won't shift. Does anyone know how much oil should be put back in without overfilling it?

Thanks,
Scott

bbadfred · 08-08-2009, 03:08 PM

I cannot remember how much they take but I am sure its more than that, take it to 5 qt and add 1/2 quart at a time til it reads on the stick. Lot of trouble but at least you wont over fill. maybe someone else will pop in with the correct amount.

lownfast · 08-08-2009, 03:36 PM

i think i put almost 11 quarts in mine

azphillyguy · 08-08-2009, 04:20 PM

Thanks for the input. I'll just keep adding until it registers.

Longhorn Man · 08-08-2009, 05:30 PM

not 11 quarts. that is for a new trans.
just go 1/2 bottle at a time. Don't overfill it. Get the fluid on the add line, then drive it around the block a few times and check it. The full line is full hot, not full cold. Over that line and it is worse for tranny life than being too low.

mclairmo · 08-10-2009, 07:30 PM

I used 4 to 5 quarts to fill after draining just the pan.

08-08-2009, 01:30 PM	#1
azphillyguy Registered User Join Date: Apr 2009 Location: King of Prussia, Pa Posts: 2	TH400 Fluid Capacity? Hi - I'm changing the tranny fluid and filter in my 72 GMC C2500 (TH400). I read in my owner's manual that I need to put 7.5 pints (about 3 3/4 quarts) of oil back in, but that didn't seem like enough when I read it, and it's not enough. That much doesn't even register on the dip stick and of course, the tranny won't shift. Does anyone know how much oil should be put back in without overfilling it? Thanks, Scott

08-08-2009, 03:08 PM	#2
bbadfred bbadfred Join Date: Mar 2008 Location: rantoul Il Posts: 461	Re: TH400 Fluid Capacity? I cannot remember how much they take but I am sure its more than that, take it to 5 qt and add 1/2 quart at a time til it reads on the stick. Lot of trouble but at least you wont over fill. maybe someone else will pop in with the correct amount. Last edited by bbadfred; 08-08-2009 at 03:09 PM.

08-08-2009, 03:36 PM	#3
lownfast Gettinlow & Goinfast Join Date: Dec 2005 Location: ft. worth, tx Posts: 223	Re: TH400 Fluid Capacity? i think i put almost 11 quarts in mine __________________ Protouring Texas built rides- 78' K5 bodied on 22's, 5.3/ 4L60E- sold-Bdydrptk5- http://67-72chevytrucks.com/vboard/s...d.php?t=358390 71' Chevelle #Bigbootyjudy 6.0 LSx, LS9 heads, Magnuson, T56 - http://ls1tech.com/forums/conversion...e-ly6-t56.html 70' Chevelle #EvilAnnie Lsx/4L80/S475 turbo- 85' C20 crew, 5.3/6L90/S475 turbo- 68' C10 5.3/4L60/Level 2 coil overs Facebook- Protouringtexasdotcom Instagram- @Protouringtexas

08-08-2009, 04:20 PM	#4
azphillyguy Registered User Join Date: Apr 2009 Location: King of Prussia, Pa Posts: 2	Re: TH400 Fluid Capacity? Thanks for the input. I'll just keep adding until it registers.

08-08-2009, 05:30 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: TH400 Fluid Capacity? not 11 quarts. that is for a new trans. just go 1/2 bottle at a time. Don't overfill it. Get the fluid on the add line, then drive it around the block a few times and check it. The full line is full hot, not full cold. Over that line and it is worse for tranny life than being too low.

08-10-2009, 07:30 PM	#6
mclairmo Registered User Join Date: Jan 2006 Location: Take Off Posts: 1,908	Re: TH400 Fluid Capacity? I used 4 to 5 quarts to fill after draining just the pan.



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