Auto Tranny gurus
Thread Starter
Drifting
Joined: Dec 2002
Posts: 1,861
Likes: 4
From: Houston TX
Auto Tranny gurus
Ok, I'm a rookie when it comes to auto transmissions. I know it's not a Corvette, but the tranny's the same. I have a '92 GMC with a 700R4. It slips and there's a rattling coming from the front of the transmission. What kind of gauge do I need to check the line pressure in the transmission. Any advice on how to approach troubleshooting and repairing this tranny would be greatly appreciated.
Safety Car
Joined: Dec 2000
Posts: 3,767
Likes: 5
From: Jacksonville Fl
Re: Auto Tranny gurus (CorvetteZ51Racer)
Rattling in the front is usually from loose flex plate to converter bolts (most common), next to that, the torque converter itself could be bad (common as well) or the flex plate is cracked (not too common)
[Modified by BBA, 8:12 PM 1/23/2004]
[Modified by BBA, 8:12 PM 1/23/2004]
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: Auto Tranny gurus (CorvetteZ51Racer)
What kind of gauge do I need to check the line pressure in the transmission.
BBA is probably right about the rattling up front. Either that, or the torque converter is starting to unravel.
Since it is slipping, you can probably save yourself some time and money and just get it replaced. More often than not, when they start slipping, there's no saving them. Good luck, and...
RACE ON!!!
Drifting
Joined: Nov 1999
Posts: 1,801
Likes: 2
From: St. Paul MN
Re: Auto Tranny gurus (CFI-EFI)
I had a rattle in mine once. I tracked it down to the flex plate occassionaly hitting the starter gear. I thought the flex plate was warped or something. Turned out I had spun bearings in the engine and the runnout was soo bad the crankshaft was actually walking back and forth in the block. I hope that's not your problem. Did you get the truck up nice and solid and take the dust shield off and run it and get under there to listen and try to see where it's coming from? Good luck.
Le Mans Master
Joined: Jan 2002
Posts: 5,320
Likes: 4
From: Kyle TX (Because Mojo Made me fill it in)
Re: Auto Tranny gurus (CorvetteZ51Racer)
Hope this helps with the pressure test. Someone posted this website and I just bookmarked it.
http://www.tvmadeez.com/pressure_test/index.html
I hope it's the correct test too.
[Modified by VetteNoob, 8:58 PM 1/23/2004]
http://www.tvmadeez.com/pressure_test/index.html
I hope it's the correct test too.
[Modified by VetteNoob, 8:58 PM 1/23/2004]
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: Auto Tranny gurus (CorvetteZ51Racer)
What kind of pressure gauge? I've never seen one specifically for transmissions, so I assume you can use some other kind.
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Thread Starter
Drifting
Joined: Dec 2002
Posts: 1,861
Likes: 4
From: Houston TX
Re: Auto Tranny gurus (CFI-EFI)
Pressure is pressure! If the face of the guage says something other than transmission pressure, will the reading be incorrect? I don't think so?
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Race Director
Joined: Sep 2000
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From: The Top of Utah
Re: Auto Tranny gurus (CorvetteZ51Racer)
True, but there are quite a few gauges out there that will get damaged if a fluid like ATF is exposed to the element. THAT was the question.
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Thread Starter
Drifting
Joined: Dec 2002
Posts: 1,861
Likes: 4
From: Houston TX
Re: Auto Tranny gurus (CFI-EFI)
Since you KNOW that, what was the point of the question???
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: Auto Tranny gurus (CorvetteZ51Racer)
Now, that's a good question. You didn't ask, that. I don't for a fact know. I have an idea, but since you've said you found one, I assume, all is well.
RACE ON!!!
RACE ON!!!