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Old 05-12-2009, 12:36 PM
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Tranny oil pump/ stator test?

Thanks to Ssedan64 for the answer to my "hole in tranny housing question"

The tranny(TH350c) went out in my truck(86' GMC 1/2 ton 2 whl. dr. 305 cid) the truck would barely move at high rpm's, the tranny was rebuilt, reinstalled and had the same symptoms, the truck would barely move at high rpm's.

Everything is new in the tranny except the torque converter & the oil pump/stator.

What test can I do on the oil pump/stator to determine if they need to be replaced?

I am low on funds, I cannot just replace the pump/ rotor.
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Old 05-12-2009, 06:41 PM
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Last edited by fast68; 05-15-2009 at 11:11 PM.
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Old 05-12-2009, 07:19 PM
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transmission

is not in the truck, how do I perform a pressure test on the bench?
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Old 05-12-2009, 08:48 PM
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Quote:
Originally Posted by mannasugar
is not in the truck, how do I perform a pressure test on the bench?
You really can't do a pressure test on the bench as there's no way to turn the converter/pump @engine speed. The clutch packs can be tested with air.
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Old 05-12-2009, 09:08 PM
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pressure test/ literature/ book

I will re-install the transmission in the truck, so, I can test it, that is what should have been done to start with, I used the wrong person, I suppose I am to blame, this is all new to me, I have studied like crazy this past week,

What book or literature will tell me the proper steps to perform test such as "stall test", "pressure test" and other test I am not familiar with?

The tranny is rebuilt, will not move truck, all that is left is the TC, Oil pump/ stator or the valve body.

Thank you for your assistance!
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Old 05-12-2009, 09:21 PM
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An ATSG manual or Haynes manual should have the Info for pressure test. Usually tested at idle & 1200rpm in every gear position. PRND21
Rebuilt pump is about $70, converter is about $110.
You should allways install a new converter with a rebuilt trans. Converter will have trash/metal, clutch friction material etc.. inside. Trans cooler lines need to be flushed out also.
Are you sure you installed the converter correctly. Spinning it back & forth you should feel 3 clicks, splines on Input shaft, Stator Support and Pump lugs must line up & engage.
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Old 05-12-2009, 09:53 PM
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I am planning on drilling a small hole (1/4") & drain the TC, flush it out with solvent, let it drain overnight, tap the hole and plug it.

I had not thought of flushing the lines, great tip. I will flush them out also.

I will make sure the TC is seated correctly.

That is what happened, "The old TC was used with the rebuild & reinstalled, running all that old gray fluid through the new parts" I took the tranny apart, cleaned it & put it back together, I did not take the valves out of the valve body!

I do not know how to remove them, Will the old fluid in the valves create the symptoms? (Truck will not move at high rpm's)
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Old 05-12-2009, 10:23 PM
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Valve body shouldn't cause it not to move in any gear. Sounds more like a pump or converter problem or linkage inside trans not connected.
I forgot about this, it's an online manual for TH350 with trouble shooting. >>>
Pressure Info on Pg.2 http://th350.netfirms.com/browser.htm
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Old 05-13-2009, 12:44 AM
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TH350C pumps hardly ever go bad. TH350 pumps are always bad.

Pull the outer gear out the pump. Run your fingernail across the outside of it. If it has ridges (wear), the pump is no good. Check the body where the outside of that gear rides. If you can feel a lip when you pull your finger out, the pump is bad. Run your fingernail over the area where the gears ride on the stator support. If you feel ridges, the pump is bad. Check the area on the drum tower near the sealing rings. If you can see wear, the pump is bad. Check the bushing in the pump body. If it is loose, the pump is bad. If it is worn and tight, replace the bushing. If everything looks good, you have a good pump.

All TH350C pumps interchange.
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Old 05-13-2009, 10:32 AM
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TC bad?

Thanx for all the great information, very helpful!

I drilled a 5/32 hole in the TC, drained it, attached the TC to the input shaft of the tranny and turned it, now that there is no fluid in it, I can hear large pieces of metal falling & making noise as I turn the TC,

I can't imagine how it can still be good!
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Old 05-13-2009, 03:16 PM
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Quote:
Originally Posted by mannasugar
I am planning on drilling a small hole (1/4") & drain the TC, flush it out with solvent, let it drain overnight, tap the hole and plug it.

I had not thought of flushing the lines, great tip. I will flush them out also.

I will make sure the TC is seated correctly.

That is what happened, "The old TC was used with the rebuild & reinstalled, running all that old gray fluid through the new parts" I took the tranny apart, cleaned it & put it back together, I did not take the valves out of the valve body!

I do not know how to remove them, Will the old fluid in the valves create the symptoms? (Truck will not move at high rpm's)
It sounds like the sprag is gone in the converter. Put your finger down inside the hub and feel for the spline that is the center of the sprag then try to turn it clockwise and counter clockwise it should only turn in one direction. If you want to check end play on the stator you need outside spapring pliers that are long enough to reach that splined part when you do check it it should be .025-.030" max. Also if you want to drain a converter take an old flywheel put it on a 5 gallon pail with hub down of course and let it drain over night you'll leave about a tablespoon of fluid inside it. I've split converters before after draining them and was suprised at the small amount left inside.

Last edited by red65novawagon; 05-13-2009 at 03:29 PM.
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Old 05-15-2009, 11:09 PM
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any more info on how to tell if a converter is possibly bad or not would be great, as i have several th350/400 ones laying around and i dont know which are my good ones and which are unknowns

i dont understand this end play checking thing

confused


thanks!
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Old 05-16-2009, 02:55 AM
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This is all new to me, from what I can tell.
There are not much that can be done to tell how good a TC is. It is difficult to understand what it is that they mean by "end play". If the TC in in the vehicle, a stall test can be performed to see if the TC is good. I think a pressure test, while the TC is in the vehicle helps. If it is not in the vehicle, there is no 100% sure way to tell. I have determined that mine is bad by drilling the hole as I have stated earlier.
Good luck!
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Old 05-16-2009, 06:54 AM
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it takes a knowledgeable person to check end play and to see if the inner sprag feels like it is functioning correctly. That is all you can look for.

if you hear meatal stuff flopping around inside the converter , that obviously indicates a problem.
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Old 05-16-2009, 02:37 PM
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sounds like a converter problem to me. as in the one way clutch in the stator is siezed
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