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Old 10-16-2006, 10:35 PM
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Powerglide problem

I have a PG in a 64 Impala. The trans will not shift from low to high. I serviced the filter and fluid. Vacuum to new modulator is good. Next step, maybe a stuck governer valve? 1-2 shift valve? all of the above?

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Old 10-17-2006, 12:31 PM
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Quote:
Originally Posted by WarWagon
I have a PG in a 64 Impala. The trans will not shift from low to high. I serviced the filter and fluid. Vacuum to new modulator is good. Next step, maybe a stuck governer valve? 1-2 shift valve? all of the above?
Did it work before the servicing? What all did your servicing include? What did you disassemble etc.
The modulator controls mainline pressure and shift points. Fluid level? Give us a little more info.
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Old 10-17-2006, 12:51 PM
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It didn't shift before I serviced it. I just dropped the pan and changed the gasket, filter and vacuum mod. Fluid level is fine.
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Old 10-17-2006, 02:15 PM
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briscoe

powerglide is a real simple trans,yes it could be a stuck valve or gov esp if the pan had debris laying in the bottom,you did not say if this was the case.i could give you some things to check,but if your not familiar with transmissions you could get into some trouble,maybe time to check with your local trans shop
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Old 10-17-2006, 07:59 PM
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Not much in the pan but clutch dust.......it looked like it hadn't been serviced in a while. I have rebuilt a few transmissions.....c4's, c6's and 400, but no PG. I think I can handle any suggestions you might have.
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Old 10-17-2006, 10:47 PM
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I would speculate that the drive pin for the rear pump that the output shaft spins has broken.

No rear pump = no upshift
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Old 10-18-2006, 04:47 PM
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There should be a pressure port for the rear pump then. I can check for pressure there.
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Old 10-19-2006, 03:17 PM
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briscoe

.re powerglide problem. warwagon here is a test you can do to check governor circut,put a gauge on the low servo apply pressure tap,disconnect vacuum from modulator.with the wheels off the ground run the car up to 10 mph,gauge should read about 130 psi.increase speed to about 50mph,if the governor is working pressure should drop to about 115 psi,this shows pressure cutback and proves the governor is working. crosley might be right and the rear pump may be the problem.if the governor is working ,then check valve body,for stuck shift valve.if you go into the unit make sure the case bushings are in good shape worn bushings pressure leaks big time,hope this helps
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