Powerglide Cooler Line Pressure

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Powerglide Cooler Line Pressure Empty Powerglide Cooler Line Pressure

Post  501ranger on February 13th 2013, 10:26 pm

I bought a used Powerglde set up for my big block mustang, and I Have a few questions. I have read about poeople having thrust bearing issues caused by to much convertor charge pressure or cooler line pressure. My questions are,
1 How do you measure the convertor charge pressure?
2 Is the convertor charge pressure compareable to the cooler line ressure?
3 What is an aceptable cooler line pressure?
4 If the cooler line pressure is to high, how can I reduce it?

Thanks for any advice.
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Post  whatbumper on February 13th 2013, 11:40 pm

You're worrying about a lot of things that you probably don't need to worry about.

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Post  whatbumper on February 14th 2013, 7:05 pm

Actual line pressure is more important. Depending on input shaft you may or may not have cooler flow. Usually thrust issues are caused by tight clearances and a ballooning converter.

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Post  501ranger on February 14th 2013, 8:54 pm

It actually destroyed the thrust bearing on the crankshaft, so I am trying to verify that everything is right so it doesn't happen again. The engine has been together for about five years with a C4 transmission. I installed the powerglide and after 9 passes I noticed the thrust problem. I know the driveshaft yoke also started to twist, so that could have contributed to the problem. I measured the pressure in the cooler lines at 80 psi in first gear. I was hopeing someone has a guideline for how much pressure to run. And if 80 psi is to much, how can I reduce it? Is there something else I need to check?
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Post  whatbumper on February 14th 2013, 10:47 pm

80-100 is fine. Ours is over 100. We run a little more internal line pressure than what you need due to the higher horsepower. How much converter pull out do you have? What converter is it?

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Post  501ranger on February 14th 2013, 11:34 pm

Flexplate to convertor clearance was atleast 1/8 inch, the convertor was a 9.5 inch unit with anti-balooning plates and the powerglide input shaft that was custom made by a transmission shop. The convertor still looks fine.
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Post  ustahava67 on February 19th 2013, 2:05 pm

I smoked the thrust bearing in my SBF/C-4. I had added another trans cooler to the circuit. The cooler lines had too sharp of a bend and restricted the flow, which cause the converter to push out. I re-routed the cooler lines and eliminated a couple of 90 degree fittings. I haven't had an issue for 4 seasons.
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Post  342g on February 22nd 2013, 1:14 pm

Figure anything out Mark?
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