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Old 03-09-2004, 01:33 AM
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700R4 Problem (Surprised?)

I've looked through most of the post's for 700r4s, saw some half similar things nothing to specific, so I figured i'd ask anyways, not knowing to much about transmissions myself.

My TH700R4 started a couple days ago making a light buzzing (like a bee near your ear) from the bell housing area. Then two days later, in the rain, it starts shifting off-beat. Now the buzzing is slightly louder (esp in neutral/park) and when the engine temp hits normal (approx 170) shifting is all over the place.
1-2 is at 3600, 2-3 about 2100, 3-4 2500 (normal), and it will shift itself from any gear to 'netrual' whenever it feels like it.
However when the engine is still cold (below 120ish) everything is fine. except for the buzzing, which is always there now.
I have a 2700 stall on there now.

From the other post's ive read, tomorrow, ill check the coverter bolts and flywheel for looseness/cracks.

Any other suggestions?

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Old 03-09-2004, 04:54 AM
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Torque converter or front pump mayby?

Vince
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Old 03-09-2004, 05:57 AM
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Sounds like a pump.
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Old 03-09-2004, 02:55 PM
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Hmm... ok, Ill check the pump out....

flexplate doesnt have any cracks/converter bolts are fine

tranny fluid is same color as used oil (oops), forgot to check that in the first place
doesnt have any weird smell to it though

Thought I'd add this, When I checked the fluid, hundereds of pinhead size bubbles were in the fluid on the dipstick

Last edited by arch; 03-09-2004 at 03:24 PM.
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Old 03-09-2004, 09:09 PM
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So it sounds like you are sucking air in to the pump. Anything from low fluid level to a cracked O-ring on the filter tube. I'd do a fluid and filter change and hope this catches the problem.
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Old 03-11-2004, 10:55 PM
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I replaced the filter/fluid, only makes the buzzing noise in reverse now.

In the bottom of the pan, the magnet was caked in extremely small metal shavings (maybe 1/4" thick), and there was a 2 inch long strip of rubber about 1/16-1/8" wide. Cleaned everything off, bolted it all back up. Old fluid was a dark brown metallic.

All forward drive gears seem fine except OD.

Any other suggestions?

New trans ?
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Old 03-11-2004, 11:01 PM
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Does that long strip of rubber look like the ends were once connected? I would suspect that it might have been the O-ring on the filter tube where it goes in to the valve body. From the sound of it, you might be ready for the rebuild. There is usually a layer of clutch material (dust) on the bottom of the pan, but the metal is not healthy.
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Old 03-12-2004, 05:03 AM
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definately not an O-ring, straight and flat, each end is broken off, and the rubber is no longer flimsy, but dried out, still has some flex in it. has a slight ridge on one side i couldnt even guess where this would go.
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Old 03-12-2004, 07:31 AM
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Usually a buzz noise in the vane type pump of the 700/4L60 tranny is 1 of 2 things.

As mentioned a filter clogged up some will cause pump noise. You say the filter was changed.

A pump that is operating at max level will buzz. Max level can be caused by a large pressure loss.

the chunk of rubber or nylon sealing ring you mention is an indicator that something is wrong. The brown oil and metal is an indicator there is trouble also.
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Old 03-13-2004, 04:58 PM
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The piece of rubber in the pan I was told is a servo seal, and "judging by the symptoms" its the 2-4 servo assembly.

I went and got some quotes from some transmission shops for Rebuilding/Reinstalling my transmission, would cost same/more as a new transmission without the benefits of a new transmission, and would take longer. And Im not exactly in the mood to do a 700r4 rebuild myself. Not that I know anything about them in the first place.

Soultion: New transmission
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