66 Powerglide slipping - Chevelle Tech
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Transmission & Driveline Transmissions and Differentials

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  #1  
Old Oct 21st, 07, 8:47 PM
66Malibu 66Malibu is offline
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Jed
 
Join Date: Jun 1999
Location: Batavia, IL
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Default 66 Powerglide slipping

My Powerglide has been rebuilt by someone knowledgeable with PG's and everything was OK for a while (like probably the first 50 miles). I don't drive the car very often. Lately when I take it for a ride, as the trans is shifting, the engine revs up as it shifts. Any ideas what causes that? I checked the fluid level, and it is good. I don't know how to adjust the linkage from the carb - I tried to set it up the same as before the rebuild.
I could try to call the guy who did the rebuild (it was 5 or 6 years ago now), but I wanted to try here first.
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  #2  
Old Oct 21st, 07, 9:53 PM
SWHEATON SWHEATON is offline
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Smile Re: 66 Powerglide slipping

If its slipping going from lo to highe gear(1st to 2nd) there is a trick that will make it shift without partial slipage or a complete neutral wehn going from low to high gear.

Your supposed to put a certain length(1"-2") of very sml diameter copper tubing into i believe the modualtor that either changes the vacuum signal on that or the sml copper tubing is installed somewhere that changes the pump pressure. But it cant be too nvolved becaiuse it only took like 15 ins to do once the car was on the lift.

It's been so many yrs i plain forgot trhe detials but i know it work because i had seen it done on customers cars at a trans shop in lat 60's early 70's . Heck,they did it to my 64 impala with 283 & glide that had approx 70k on it when they did it and had 125k on it when i sold it and trans was still fine.

So ask the trans guy about that trick if he is old enough to know about it but i have to say a new/fresh completely rblt glide should not be acting like that.

There are some auto trans techs here in t/chevelle that can likely expand on this,i just plain forgot the details,been too many yrs.

Scott
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SCOTT
1969 CHEVELLE SS396,ORIGINAL #'S MATCH,GOT IN 1978,(In 2001 rblt/bored original 396 .030 to 402)/M20/12BOLT/3:31'S
2006 YAMAHA 1700 ROADSTAR SILVERADO (1 owner ,GOT in 2009,4,700 miles/WK end fun)
1977 KAWASAKI KZ1000 (AM ORIGINAL OWNER ,GOT IN 1977,NOW has 29k miles/WK end fun)
2002 MAXIMA (DAILY DRIVER/1 owner,GOT 3/2013 w-44k miles)
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  #3  
Old Oct 21st, 07, 10:04 PM
Augustboy2009 Augustboy2009 is offline
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Default Re: 66 Powerglide slipping

My 1967 Impala wagon did that with a 327/glide combo. I was told you can adjust something in the trans to make the shift from slipping. Probably the same thing that SWHEATON is talking about.
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  #4  
Old Oct 21st, 07, 10:21 PM
davis95 davis95 is online now
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Doug Davis
 
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Default Re: 66 Powerglide slipping

Your powerglide has a bolt on the side that is a clutch band adjuster. I don't remember the setting, but you should be able to find it easily in an old Chilton manual. This'll probably fix your problem.
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  #5  
Old Oct 22nd, 07, 9:43 AM
SWHEATON SWHEATON is offline
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Smile Re: 66 Powerglide slipping

When i saw the tweak done yrs back to stop the slip or in some cases a complete neutral when shifting from low to high in the glides it definately was not a band adj that fixed it in that case.

I saw them cut a short piece of very sml diameter copper tuding and insert it into the modulator or something that looked like it and that took care of it,didnttake long to do at all.

It either changed the vacuum signal for modulator or whatever they did increased the internal fluid or pump pressure somehow to eliminate that issue many experienced .

Scott
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SCOTT
1969 CHEVELLE SS396,ORIGINAL #'S MATCH,GOT IN 1978,(In 2001 rblt/bored original 396 .030 to 402)/M20/12BOLT/3:31'S
2006 YAMAHA 1700 ROADSTAR SILVERADO (1 owner ,GOT in 2009,4,700 miles/WK end fun)
1977 KAWASAKI KZ1000 (AM ORIGINAL OWNER ,GOT IN 1977,NOW has 29k miles/WK end fun)
2002 MAXIMA (DAILY DRIVER/1 owner,GOT 3/2013 w-44k miles)
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  #6  
Old Nov 4th, 08, 1:48 PM
66Malibu 66Malibu is offline
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Jed
 
Join Date: Jun 1999
Location: Batavia, IL
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Default Re: 66 Powerglide slipping

Thought I'd revisit this post since I never fixed this problem. I noticed while driving this morning that if I accelerate slowly, with little pressure on the gas pedal, the shifting is smooth. But a little heavier on the gas, and the engine revs as the trans shifts.

Any new ideas on how to fix?
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  #7  
Old Nov 4th, 08, 1:54 PM
rbwjr325 rbwjr325 is offline
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Rich
 
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Default Re: 66 Powerglide slipping

Modulaters Are Cheap.
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  #8  
Old Nov 5th, 08, 7:50 PM
SWHEATON SWHEATON is offline
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Smile Re: 66 Powerglide slipping

Jed,again,its the same problem as was stated earlier,it slips more between low and high gear with more gas due to more load on the trans at that time.

Its a very common issue with the glides,my father had a car lot in the 50s-early 80s and 7 or 10 glides did it and would last over 100k doing it too.

But a good shop that knows glides should fix be able to tweak it to get rid of the sloppy low to high shift .

For now untill you get it fixed use a normal to considerable mount of gas when getting going from a stop but then about when you would like it to shift back off the gas approx 1"-1.5" to remove a little power to let it shift . Doing that helps it to ont slip & slide as much when shifting from low tohi gears ,then righ after it shifts into hi gear simply reapply that 1" -1.5" of gas you had backed off untill your up to your desired cruise speed.

But no matter what the problem is (adjustment/modualtor-etc) take it back to the builder,thats the right way to get it corrected so he doesnt blame anyone else for messing it up if there are any issues down the road with the trans leaving you holding the bag.

Scott
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SCOTT
1969 CHEVELLE SS396,ORIGINAL #'S MATCH,GOT IN 1978,(In 2001 rblt/bored original 396 .030 to 402)/M20/12BOLT/3:31'S
2006 YAMAHA 1700 ROADSTAR SILVERADO (1 owner ,GOT in 2009,4,700 miles/WK end fun)
1977 KAWASAKI KZ1000 (AM ORIGINAL OWNER ,GOT IN 1977,NOW has 29k miles/WK end fun)
2002 MAXIMA (DAILY DRIVER/1 owner,GOT 3/2013 w-44k miles)
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  #9  
Old Nov 5th, 08, 10:22 PM
66Malibu 66Malibu is offline
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Jed
 
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Default Re: 66 Powerglide slipping

Thanks, Swheaton. I'll try to call the guy who rebuilt the trans.
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  #10  
Old Nov 14th, 09, 2:43 PM
66Malibu 66Malibu is offline
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Jed
 
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Location: Batavia, IL
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Default Re: 66 Powerglide slipping

I was finally able to leave the car with the guy who did the trans rebuild. He discovered that the modulator was damaged, bent a little or something. He replaced it for $100 and the shifting is perfect now. He had helped me previously adjust the linkages and get the shift timing right and hadn't charged me anything at that time. So all's well that ends well.

Thanks again for all the suggestions.
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