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Old 09-13-2008, 07:04 PM
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700r4 pump broke twice in 2 days

had a pump to break in a 7000r4 tranny. was on the way to rod run in tn. after wreckered 70mi. got it repaired, left next day, it broke again. any suggestions on what caused it to break. lock up was working correctly and trans temp was good.
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Old 09-13-2008, 10:32 PM
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Quote:
Originally Posted by robertnesmith
had a pump to break in a 7000r4 tranny. was on the way to rod run in tn. after wreckered 70mi. got it repaired, left next day, it broke again. any suggestions on what caused it to break. lock up was working correctly and trans temp was good.
Unless you describe what happened no one is going to be able to answer your question. You are asking us to diagnose a problem when we have no idea what actually happened.
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Old 09-13-2008, 11:44 PM
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the pump went out while running about 55mph. observation of the first pump that broke showed the rotor was broken in peices. trans was taken about half way apart to make sure metal particles did'nt contaminate the transmission. checked out good. the truck now sits at a shop for repair with a guy who has been building high performance transmissions for 25yrs. after he fixed it, i left his shop and drove about 80 miles and the same thing happend again. the only thing that has been changed on this transmission in 6k miles is the torque converter. when it was changed i drove the truck some 300mi before any problem ever occured. he seems to think something is wrong with the converter. will find out monday.
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Old 09-13-2008, 11:47 PM
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also never noticed no vibration, shaking, noises, nothing other than normal.
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Old 09-14-2008, 08:03 AM
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I would be looking at the converter,

Look at the flex plate for cracks , bent

Look at the trans to engine alignment dowels and matching holes in trans case.

Check crank shaft end for wear at the point the converter pilot hub slides in.

Make sure you have the converter fully seated in the trans before bolting the assembly to the engine.
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Old 09-14-2008, 08:51 AM
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trans mechanic seems to think the converter is the culprit. everything is new, motor, trans, everything!!!! when it broke i was so mad!! now im depressed. can't wait till monday for the investigation to begin. any ideas let me know.
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Old 09-14-2008, 10:18 AM
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Quote:
Originally Posted by robertnesmith
trans mechanic seems to think the converter is the culprit. everything is new, motor, trans, everything!!!! when it broke i was so mad!! now im depressed. can't wait till monday for the investigation to begin. any ideas let me know.
I gave you 5 ideas.

New parts or not , check them. I've seen many bad "new" parts.

The trans case is not new.... look at the alignment dowel holes for wear. Look at the engine dowel pins for wear or missing. Misalignment will cause pump problems.

Converter should be checked for run out...... to see if it is in or out of specs

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Old 09-15-2008, 02:54 PM
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Quote:
Originally Posted by robertnesmith
the pump went out while running about 55mph. observation of the first pump that broke showed the rotor was broken in peices. trans was taken about half way apart to make sure metal particles did'nt contaminate the transmission. checked out good. the truck now sits at a shop for repair with a guy who has been building high performance transmissions for 25yrs. after he fixed it, i left his shop and drove about 80 miles and the same thing happend again. the only thing that has been changed on this transmission in 6k miles is the torque converter. when it was changed i drove the truck some 300mi before any problem ever occured. he seems to think something is wrong with the converter. will find out monday.
Sounds like the converter isn't setting correctly in the pump drive.

Bogie
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Old 09-16-2008, 01:51 AM
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I would look at the converter. Sounds like a misaligned converter hub to me.

Or to put it another way, the concentricity of the hub and the rest of the converter is off.
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Old 09-21-2008, 12:21 AM
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after having the converter checked at a shop for run-out, i almost passed out. think .042 s enough run-out??????? ATTENTION !!!!!! do not buy a PDQ converter. i cannot believe what i went through from buying that piece junk!!!!!!!!!!!
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Old 09-21-2008, 03:09 PM
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Quote:
Originally Posted by robertnesmith
after having the converter checked at a shop for run-out, i almost passed out. think .042 s enough run-out??????? ATTENTION !!!!!! do not buy a PDQ converter. i cannot believe what i went through from buying that piece junk!!!!!!!!!!!
I am assuming that you are talking about PDQ out of Sacramento. If so, you are another victim of theirs.

Several years ago a local shop cut open one of their UNUSED REBUILT converters for an E4OD.

Inside looked like a tornado had gone through it. And their solution was to tack weld the fins where they were instead of throwing the whole thing in the trash.
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Old 09-21-2008, 06:58 PM
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mmerlinn you are absolutely correct. there was another post on here somewhere and someone was wanting to know about PDQ. hope nobody else gets the shaft. PDQ torque converters is not a brand to spend your money on.
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