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#1 |
Registered User
Join Date: Apr 2011
Location: Idalou, TX
Posts: 20
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TH400 Transmission using Fluid...but where is it going???
I just recently purchased a 72C10. I believe it has the TH400 Transmission. When I pulled away from the place of purchase I added a quart of transmission fluid. I drove it at most 10 miles and it has been parked for 2 weeks while I tinker with it. Tonight I had to put in another quart to get the fluid to the correct level. There are no visual signs of leaks on my garage floor. Is this leaking around the transmission and then collecting dirt or what?
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#2 |
Restoration Virgin!
Join Date: Jan 2008
Location: Huntersville, NC
Posts: 8,298
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Re: TH400 Transmission using Fluid...but where is it going???
wonder if the torque converter is full??...has the tranny been recently rebuilt???
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Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present |
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#3 |
Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,269
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Re: TH400 Transmission using Fluid...but where is it going???
could the vaccum modulator be the culprit? when they go bad the diaphram leaks and fluid is sucked into the intake manifold then burned by the engine. pull the vac. hose off see if it is wet in there or really soft and squishy. jim
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#4 |
Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,148
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Re: TH400 Transmission using Fluid...but where is it going???
That's where I would start too.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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#5 |
Dave's not here, man
Join Date: Jun 2004
Location: Winder, Georgia
Posts: 2,000
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Re: TH400 Transmission using Fluid...but where is it going???
Possibly leaking from the transmission cooler into the cooling system?
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- 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250 Last edited by dave2953; 05-04-2011 at 09:39 PM. |
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#6 |
Registered User
Join Date: Apr 2011
Location: Idalou, TX
Posts: 20
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Re: TH400 Transmission using Fluid...but where is it going???
The tranny has not been rebuilt for a long time. I will check the vacuum lines and see if that is it. There seems to be a lot of oil soaked dirt all around the transmission that could be soaking it up. Where would leaks form on a transmission except for around the pan?
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#7 |
Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,269
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Re: TH400 Transmission using Fluid...but where is it going???
front seal ,rear seal ,around the dipstick[thats a bigge] speedo housing extension housing and of course the overflow in the top [breather]
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#8 |
Registered User
![]() Join Date: Jan 2009
Location: bmt,tx
Posts: 127
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Re: TH400 Transmission using Fluid...but where is it going???
Check the vaccuum modulator on the pass side probably diaphram busted sucking the fluid into the motor .It does it so slow it doesnt smoke but sucks the fluid out of the trans
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#9 |
Registered User
Join Date: Sep 2010
Location: British Columbia
Posts: 484
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Re: TH400 Transmission using Fluid...but where is it going???
Mine leaks out the tach cable, like a sieve mind you.
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Trevor "You already said spite" |
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#10 |
454 MAKES IT ROAR
Join Date: Jan 2008
Location: Essex, U.K
Posts: 2,701
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Re: TH400 Transmission using Fluid...but where is it going???
Just putting this out there,...you did check the fluid level on hot idle? it may not really have needed the top up.
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Nigel. An American living in a British body. 1971 Chevy Cheyenne 10 454 "In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell "When injustice becomes law, resistance becomes duty" - Thomas Jefferson No more pain. 03.12.60 -- 12.28.10 http://www.youtube.com/Eightbanger |
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#11 | |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,004
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Re: TH400 Transmission using Fluid...but where is it going???
Quote:
the truck is running and warmed up when you are checking the fluid, right? Posted via Mobile Device
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#12 |
Registered User
Join Date: Apr 2011
Location: Idalou, TX
Posts: 20
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Re: TH400 Transmission using Fluid...but where is it going???
The truck is definately warmed up and running. I will check the heat coolant when I get back and also look at the other things you guys mentioned. Thanks for all the help!
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#13 |
Registered User
Join Date: Apr 2010
Location: Boise, ID
Posts: 1,280
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Re: TH400 Transmission using Fluid...but where is it going???
I would check your radiator. I lost one 700R4 this way as stated above, the heat exchanger can go and mix the fluid, you keep pouring in tranny fluid and it disappears. If it's your heat exchanger your antifreeze/coolant will look like a brown/pinkish milkshake.
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