Transmissions and Drivetrain Need help with your trans? Problems with your axle?

700r4 not getting pressure?

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Old Jul 10, 2007 | 08:40 AM
  #1  
hectre13's Avatar
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From: SE Michigan
Car: 1984 15th Anv. T/A
Engine: HO 5.0
Transmission: TH700r4
Axle/Gears: not sure yet!
700r4 not getting pressure?

ok,

so my car starts up and runs fine, but nothing happens when i put it in gear, the car doesnt even bog or anything.. no load is being put on the engine..

i had the back end of my car on jack stands to see if i could get the tires to turn at all.. here is the weird part.. every once in a while, when i start my car, there is this weird humming noise that comes from the transmission, but when it makes that noise, my back tires will turn when putting it in gear, but the bad thing about it is, my car shakes, and it scares me, so i shut the car off.

my brother thinks that it could be a bad pump or something, causing it to not go into gear, which is possible i guess.. but would a bad pump cause the transmission to work sometimes and not others, and to vibrate terribly?

i was thinking about buying an overhaul kit, a new pump, and a shift kit possibly.. what do you all think? could i get away with buying new seals for the pump, or would it be better off buying a new pump,

lemme ask you this... does the whole pump thing sound like it could be the problem?

also whenever you shut the car off.. you hear a weird like whizz noise from the trans.. dunno if thats the pump.. i dunno.. whatcha all think?

-jeremy
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Old Jul 10, 2007 | 12:53 PM
  #2  
performabuilt's Avatar
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From: hazleton pa
Re: 700r4 not getting pressure?

To determine if its the pump remove one trans line at radiator . Start car briefly does it spray fluid? If so the pumps working if not thats your problem , But the whizing sound when you turn the car off sounds like a hard parts failure.
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Old Jul 11, 2007 | 03:51 PM
  #3  
Shagwell's Avatar
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From: Southwest Florida
Car: projects.......
Re: 700r4 not getting pressure?

are you sure all the torque converter bolts are still in?
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Old Jul 11, 2007 | 04:08 PM
  #4  
hectre13's Avatar
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From: SE Michigan
Car: 1984 15th Anv. T/A
Engine: HO 5.0
Transmission: TH700r4
Axle/Gears: not sure yet!
Re: 700r4 not getting pressure?

yepp.. thats the first thing we thought about.. torque converter is bolted on fine, and is turning the pump fine.
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Old Jul 11, 2007 | 04:22 PM
  #5  
Shagwell's Avatar
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From: Southwest Florida
Car: projects.......
Re: 700r4 not getting pressure?

...well, if the converter is bolted up, it's full of fluid, and the shift linkage is moving into gear and the output shaft still isn't turning...it's time to go through the trans.
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Old Jul 11, 2007 | 11:32 PM
  #6  
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From: hazleton pa
Re: 700r4 not getting pressure?

Did you remove the trans line like I suggested ?
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Old Jul 12, 2007 | 09:13 AM
  #7  
hectre13's Avatar
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From: SE Michigan
Car: 1984 15th Anv. T/A
Engine: HO 5.0
Transmission: TH700r4
Axle/Gears: not sure yet!
Re: 700r4 not getting pressure?

not yet, at the moment my engine is partly disassembled so i cant start it yet...
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