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powerglide downshifts too soon
Posted by: Whale460 ()
Date: October 30, 2018 06:12AM

On the 700 mile trip for the fan belt toss, my powerglide has been downshifting at increasingly higher RPMs. Now, at idle, it downshifts at about 30 mph, and if I floor it at up to about 65 mph, it will downshift, bringing me to nearly 6000 rpm.
It was not doing this when I left home, and is getting worse.
Any ideas??
~Thanks....Chuck

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Re: powerglide downshifts too soon
Posted by: thumper477 ()
Date: October 30, 2018 06:26AM

Broken e-clip in valve body?

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Re: powerglide downshifts too soon
Posted by: aircooled6 ()
Date: October 30, 2018 09:45AM

check the fluid level. while you have the dipstick out, do a sniff check on the fluid to see if it smells burnt.

check the governor to make sure it isnt coming loose.

I think the e-clip would prevent it from going into high gear at all.

Thats about all I can offer and maybe neither will help, but they are both easy to do!

Everett Wilson
North Richland Hills TX
(Now, South of 820!!)
64 Greenbrier 110 with 95 heads/PG

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Re: powerglide downshifts too soon
Posted by: Whale460 ()
Date: October 30, 2018 03:53PM

Thanks guys, I will get on this in a couple days....

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Re: powerglide downshifts too soon
Posted by: TerribleTed ()
Date: October 30, 2018 08:05PM

Could be TV valve adjustment or issue or intermediate throttle linkage way out of adjustment

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Edited 1 time(s). Last edit at 10/30/2018 08:05PM by TerribleTed.

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Re: powerglide downshifts too soon
Posted by: MattNall ()
Date: October 30, 2018 08:26PM

Chuck...change the governor and see what happens





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Re: powerglide downshifts too soon
Posted by: Whale460 ()
Date: November 05, 2018 05:50AM

latest update; checked my linkage, it is where its supposed to be. Traded out my governor and no change. still does forced downshift at almost 30 mph when hot. 25 mph when cold.
Perhaps the Amsoil ATF does not work well with my new PG, although it worked fine in my old one.

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Re: powerglide downshifts too soon
Posted by: Mike Stillwell ()
Date: November 05, 2018 09:31AM

I’d change out the vacuum modulator as well. The fail internally. If you pull the line and fluid comes out, it’s bad... or if it won’t hold a vacuum with a mini pump.

Mike
YS-117

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Re: powerglide downshifts too soon
Posted by: rnch ()
Date: November 06, 2018 07:50AM

Mike Stillwell Wrote:
-------------------------------------------------------
> I’d change out the vacuum modulator as well. The
> fail internally. If you pull the line and fluid
> comes out, it’s bad... or if it won’t hold a
> vacuum with a mini pump.
>
> Mike
> YS-117



Yup! Checking the vacuum modulator, with a mini pump, or visually for any fluid dripping out of it, is a cheap and easy thing to do.

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