Automatic transmission losing fluid

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  #1  
Old 09-22-07, 01:07 PM
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Automatic transmission losing fluid

1996 Dodge Cummins 5.9 L ...3/4 ton Pick-up with factory installed 3 speed automatic transmission. Every 4 weeks have to add about 1 1/2 pints of tranny fluid, don't know where it's going. There's no leaks at the rear seal, or transmission lines. Even checked the rad looking for a tint of red, nothing. No blow-by at the filler pipe either. Placed cardboard under the engine and tranny, nothing...I did have the tranny lines repaired about 10 weeks ago, but it's not leaking there either. I usually know when I need fluid when I make a tight right hand turn at about 10 mph and the engine revs to about 1800 RPM on acceleration... this is weird. HELP !!!
 
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Old 09-22-07, 02:19 PM
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It has to be leaking into and between the transfer case and the tranny due to a bad seal.
 
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Old 09-22-07, 05:51 PM
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You say transfer case, BUT it's only 2 wheel drive ????
 
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Old 09-22-07, 06:45 PM
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Originally Posted by Northof7 View Post
You say transfer case, BUT it's only 2 wheel drive ????
good point.


If you are sure the tranny fluid is not in the radiator, I would then check the transmission modulator. If the modulator is cracked, it will allow tranny fluid to be sucked up into the intake manifolds.
 
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Old 09-24-07, 08:00 AM
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oh oh.... that don't sound good !! Just confirm if I'm thinking of the right place for this modulator, is it that long part under the exhaust manifold, has a tranny fluid line on each end of it ??
 
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Old 09-24-07, 11:13 AM
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That doesn't sound like it. If you have a vacuum modulator it would be mounted to the tranny itself and probably only have one vacuum line going to it. The modulator has a diaphragm inside and when they go it allows what Mark described.
 
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Old 09-25-07, 10:25 AM
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Nope, don't see a modulator, but I see a throttle valve that works by a cable, but that looks ok... Have 3 electrical components as well, nuetral/start switch, speed sensor, and transmission solenoid.. Going to powerwash the tranny cause I can see evidence of fluid where the speed sensor is mounted to the tranny, but way to dirty to tell...
 
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Old 09-27-07, 09:14 AM
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Just a follow up, but I think Ive located the leak.. after powerwashing the trannsmission and driving for a couple of days, there is definitely a very tiny amount of tranny fluid leaking out of the VSS.. drops on the casing and fluid around where it goes into the transmission. I'm assuming there's an "O" ring in there that has worn.
 
  #9  
Old 10-05-07, 10:23 AM
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Leak fixed.... replced "O" ring on the VSS. Was really hard to locate 'til I cleaned the tranny.
 
  #10  
Old 11-08-07, 12:16 AM
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Unhappy I feel silly asking such a basic question but...

How do I add/change the transmission fluid for an automatic 84 camaro ?

Thank you for any help you can give me in advance,

simplydew.
 
  #11  
Old 11-08-07, 04:10 AM
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Here's how on a Firebird; your Camaro should be similar:

http://www.autozone.com/az/cds/en_us...rInfoPages.htm

Welcome to the forums, but please post questions as a new thread when posting.

TG
 
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