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89 700R4 lost all gears on highway

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Old May 1, 2018 | 08:59 AM
  #1  
FART_NUGGETS's Avatar
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From: Southern NJ
Car: 1989 Iroc-Z Convertible
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 2.73:1
89 700R4 lost all gears on highway

Cruising to work this morning loving life, cruise set at 70 on the highway, when engine revved up like it fell into neutral. Coasted off into shoulder, no forward or reverse gears, and a bit of a rattling/ticking from the torque converter area. Converter is still bolted to flywheel and spinning so it's not that. About 500 miles on a rebuild on the 700r4, was running perfect. I suspect I lost the pump. Going to pull the trans in a few days and check it out. Anyone else have any other ideas? Fluid level read high making me also think the pump is not pumping.

thoughts?
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Old May 1, 2018 | 10:44 AM
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Lurbie's Avatar
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From: Davison, MI
Car: 89 Camaro
Engine: Dart SHP 400-Holley Terminator EFI
Transmission: Tremec T56 Magnum F
Axle/Gears: Strange S60 3.55:1
Re: 89 700R4 lost all gears on highway

Originally Posted by FART_NUGGETS
Cruising to work this morning loving life, cruise set at 70 on the highway, when engine revved up like it fell into neutral. Coasted off into shoulder, no forward or reverse gears, and a bit of a rattling/ticking from the torque converter area. Converter is still bolted to flywheel and spinning so it's not that. About 500 miles on a rebuild on the 700r4, was running perfect. I suspect I lost the pump. Going to pull the trans in a few days and check it out. Anyone else have any other ideas? Fluid level read high making me also think the pump is not pumping.

thoughts?
Connect a pressure gauge to the service port on the left side and see what your pressures are before you pull it out. Drop the pan next to see if the filter fell off.
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Old May 1, 2018 | 10:48 AM
  #3  
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From: Huntsville AL
Car: 88GTA
Engine: 5.7TPI
Transmission: Auto
Axle/Gears: 3.27
Re: 89 700R4 lost all gears on highway

"Fluid level read high making me also think the pump is not pumping."

I'm going with Lurbie on this one. If the filter fell off, all the fluid in the trans drained to the pan....giving you the high reading.
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Old May 1, 2018 | 11:24 AM
  #4  
FART_NUGGETS's Avatar
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From: Southern NJ
Car: 1989 Iroc-Z Convertible
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 2.73:1
Re: 89 700R4 lost all gears on highway

Man that would make my day...........

I'll let you know what I see once I pull the pan.
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Old May 2, 2018 | 05:59 AM
  #5  
FART_NUGGETS's Avatar
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From: Southern NJ
Car: 1989 Iroc-Z Convertible
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 2.73:1
Re: 89 700R4 lost all gears on highway

Pump is toast. Apparently there was too much of a gap between the reman converter and the flex plate, which caused the converter drive to not fully engage the pump ears when I bolted it to the flexplate. I should have shimmed with washers. Haven't removed the pump yet but I can see in the gap between the input shaft and seal that its chewed up, one ear appears to be missing. Hopefully pull the pump tonight and open it up.
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Old May 2, 2018 | 07:26 AM
  #6  
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From: Huntsville AL
Car: 88GTA
Engine: 5.7TPI
Transmission: Auto
Axle/Gears: 3.27
Re: 89 700R4 lost all gears on highway

Well, that sucks. Was hoping that wasn't it either. Good luck with the repair.
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Old May 2, 2018 | 11:52 AM
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From: NJ
Car: 1987 IROC-Z
Engine: 406 on N20 w/ EFI
Transmission: P.B. 700R4
Axle/Gears: 12 bolt w/ 3.91
Re: 89 700R4 lost all gears on highway

that would certainly do it

I read about checking the distance of this gap prior to doing my install a while back and I used 3 hardened washers (i forget the thickness) to close up the gap. I will be getting my rebuilt/upgraded trans in a few days (from proBuilt automatics) and installing it this weekend (again) and I was thinking that I neeeded to make sure I checked this gap...otherwise the pump wont engage, etc etc, you know where I am going with this. I do forget the exact distance (acceptable amount of gap allowed) though... I think it was 3/8" ?


Originally Posted by FART_NUGGETS
Pump is toast. Apparently there was too much of a gap between the reman converter and the flex plate, which caused the converter drive to not fully engage the pump ears when I bolted it to the flexplate. I should have shimmed with washers. Haven't removed the pump yet but I can see in the gap between the input shaft and seal that its chewed up, one ear appears to be missing. Hopefully pull the pump tonight and open it up.

Last edited by IROCZman15; May 2, 2018 at 12:00 PM.
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Old May 2, 2018 | 07:35 PM
  #8  
FART_NUGGETS's Avatar
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From: Southern NJ
Car: 1989 Iroc-Z Convertible
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 2.73:1
Re: 89 700R4 lost all gears on highway

Good times. Grabbed a reman pump for $90, going to replace the converter too just because I'm paranoid and it's cheap.




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Old May 2, 2018 | 07:35 PM
  #9  
FART_NUGGETS's Avatar
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Posts: 199
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From: Southern NJ
Car: 1989 Iroc-Z Convertible
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 2.73:1
Re: 89 700R4 lost all gears on highway

I even cracked the slide ring so I do feel kinda special
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