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Username Post: Questions servicing PowerGlide transmission        (Topic#349085)
Loren S 
Silver Supporting Member
Posts: 21
Loren S
Loc: NW Ohio, Northern Michiga...
Reg: 08-02-17
01-09-18 08:36 AM - Post#2720544    

I have pulled the 235 CI engine and PowerGlide transmission from my 50 Chevy. The engine is out for overhaul. I am questioning what I should do to service the transmission while it is out of the car. The transmission was running fine but was leaking fluid severely (1 Qt per 20 miles). Occasionally it will slip, just slightly while rounding a curve or accelerating uphill. Is there an adjustment to make for the slippage or should I consider overhauling the transmission while it is out of the vehicle.
Note, the car is a survivor. I have no history of any mechanical maintenance done on the car. The previous owner who had painted it passed away and left no records.
Thanks in advance for your advice.

These are the "Good Ole Days:.


 

Chevs of the 40s

Shepherd 
Frequent Contributor
Posts: 1421

Loc: Lake George, NY
Reg: 11-11-15
01-09-18 08:47 AM - Post#2720547    
    In response to Loren S

At a minimum the leaks should be corrected, band adjusted, new fluid. If in fact it slips because of an internal issue, then it would have to come out again, which as you know, not an easy job. Was the fluid burnt?



 
2blu52 
"17th Year" Silver Supporting Member
Posts: 18568
2blu52
Age: 85
Loc: Montana
Reg: 03-12-02
01-09-18 09:25 AM - Post#2720554    
    In response to Loren S

Scroll up about five click from where you clicked to get on this forum, you will find a 49/54 facts sticky note. Inside this site you will find a plethora of information on 49/54 Chevrolet's including a copy of the 49/54 Shop Manual which has considerable information about your PG transmission.

"PEACE IS THAT GLORIUS MOMENT IN HISTORY WHEN EVERY ONE STANDS AROUND RELOADING"

THOMAS JEFFERSON


 
Gene_Schneider 
Ultra Senior Member
Posts: 12158

Loc: Wisconsin..USA
Reg: 09-27-02
01-09-18 04:34 PM - Post#2720595    
    In response to Loren S

If it slips when making a fast right turn the fluid is too low.
By your description of the various problems the transmisson should be completely overhauled.

Do it now while the engine is out as it is very difficult to remove when the engine is in place.

ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible


 
Bel Air kiwi 
"3rd Year" Silver Supporting Member
Posts: 4328
Bel Air kiwi
Loc: New Zealand
Reg: 04-24-14
01-09-18 05:23 PM - Post#2720600    
    In response to Gene_Schneider

Hi Loren, Welcome. There is also a sticky post on a rebuild by our Canadian friend Fritz.

There are significant differences between the first Power-glide and the upgraded versions from 53-4.

The early glides had a unique two stage converter. (5 Element.) in lieu of full automatic up and down shifting.
You can tell the later versions externally by an additional plate on the side of the housing.
The later is a superior transmission and finding a good second hand unit would be my preference for rebuilding.

Also be aware that you shouldn't be running the engine in these transmissions in park like you can with modern ones. Apparently the internal lubrication is compromised as it was intended to be run only in neutral or gear.

Cheers Kiwi

48 3100 RHD, 51 Deluxe 4DR RHD, 51 Bel Air parts car, 52 Bel Air P-Glide LHD. Others 23T, 32 Tudor, 58 Edsel pacer 4DR HDT, 79 F250 351C RHD. 69,70,82 Capri. No mobile, no TV, and no Jap cars.

"They made a desert and called it peace." Tacitus


 
Toqwik 
Contributor
Posts: 289
Toqwik
Loc: Middleburg, FL
Reg: 05-14-17
01-09-18 05:43 PM - Post#2720604    
    In response to Bel Air kiwi

Kiwi, my glide is a 53. Should I not let in run in park as well? I never heard that before.

Contentment is the smother of invention


 
Bel Air kiwi 
"3rd Year" Silver Supporting Member
Posts: 4328
Bel Air kiwi
Loc: New Zealand
Reg: 04-24-14
01-09-18 06:50 PM - Post#2720612    
    In response to Toqwik

Hi Twoqwik, I have only heard this as hearsay, but the scuttle butt was one of the two pumps doesn't lubricate the trans when in park.
Sorry I don't know when the design changed or if its actually a myth.

Rear pump requires vehicle movement, I believe, and it allows the car to be towed short distances at low speeds. So it only works in the driving gears

So it is probably the front pump in question and what it is doing in Park. If it was locked or not driven in park then there is no oil flow then.

Its one of these things that could go either way, and hopefully we can get a confirmation on this. Neutral should have the front pump spinning and most of the trans internals in motion but not locked into action.

A bit more research is required, Cheers Kiwi

48 3100 RHD, 51 Deluxe 4DR RHD, 51 Bel Air parts car, 52 Bel Air P-Glide LHD. Others 23T, 32 Tudor, 58 Edsel pacer 4DR HDT, 79 F250 351C RHD. 69,70,82 Capri. No mobile, no TV, and no Jap cars.

"They made a desert and called it peace." Tacitus


Edited by Bel Air kiwi on 01-09-18 07:03 PM. Reason for edit: No reason given.

 
Bel Air kiwi 
"3rd Year" Silver Supporting Member
Posts: 4328
Bel Air kiwi
Loc: New Zealand
Reg: 04-24-14
01-09-18 07:01 PM - Post#2720615    
    In response to Bel Air kiwi

Hi Twoqwik, I had a quick look and I can't figure out why you would build it this way. GM must have known this would be a warranty nightmare.

I suspect that someone may have confused the directive not to shift into park when moving with not to have the engine running in park.
Otherwise why would the inhibitor switch let you start in park?

Cheers Kiwi

48 3100 RHD, 51 Deluxe 4DR RHD, 51 Bel Air parts car, 52 Bel Air P-Glide LHD. Others 23T, 32 Tudor, 58 Edsel pacer 4DR HDT, 79 F250 351C RHD. 69,70,82 Capri. No mobile, no TV, and no Jap cars.

"They made a desert and called it peace." Tacitus


 
Shepherd 
Frequent Contributor
Posts: 1421

Loc: Lake George, NY
Reg: 11-11-15
01-09-18 07:50 PM - Post#2720620    
    In response to Bel Air kiwi

Back in the day it was a 90 day warranty, so I don't think they considered that issue.



 
Bel Air kiwi 
"3rd Year" Silver Supporting Member
Posts: 4328
Bel Air kiwi
Loc: New Zealand
Reg: 04-24-14
01-09-18 08:50 PM - Post#2720632    
    In response to Shepherd

Hi Shepard, Commercial reputation still mattered, so things that broke under say 20,000 miles were still a big deal.

Cheers Kiwi

48 3100 RHD, 51 Deluxe 4DR RHD, 51 Bel Air parts car, 52 Bel Air P-Glide LHD. Others 23T, 32 Tudor, 58 Edsel pacer 4DR HDT, 79 F250 351C RHD. 69,70,82 Capri. No mobile, no TV, and no Jap cars.

"They made a desert and called it peace." Tacitus


 
Airlifter 
"3rd Year" Gold Supporting Member
Posts: 502
Airlifter
Age: 73
Loc: Tazewell county, Virginia
Reg: 06-07-15
01-10-18 05:08 AM - Post#2720657    
    In response to Bel Air kiwi

The '54 manual warns "Do not operate engine for long periods of time with selector lever in Park"

I could find no mention of this in the earlier manuals. Maybe they learned something.

1951 styline deluxe sport coupe w/54 engine & powerglide


 
Bel Air kiwi 
"3rd Year" Silver Supporting Member
Posts: 4328
Bel Air kiwi
Loc: New Zealand
Reg: 04-24-14
01-10-18 05:40 AM - Post#2720659    
    In response to Airlifter

Hi Airlifter, so there is some truth to the story.
It may well be something they discovered when they made the 53 updates. Those glides had the more conventional three element converter and revised operation so they would up shift from low to drive automatically. I wonder what they consider a long period is?

Cheers Kiwi

48 3100 RHD, 51 Deluxe 4DR RHD, 51 Bel Air parts car, 52 Bel Air P-Glide LHD. Others 23T, 32 Tudor, 58 Edsel pacer 4DR HDT, 79 F250 351C RHD. 69,70,82 Capri. No mobile, no TV, and no Jap cars.

"They made a desert and called it peace." Tacitus


Edited by Bel Air kiwi on 01-10-18 05:41 AM. Reason for edit: No reason given.

 
2blu52 
"17th Year" Silver Supporting Member
Posts: 18568
2blu52
Age: 85
Loc: Montana
Reg: 03-12-02
01-10-18 07:00 AM - Post#2720666    
    In response to Bel Air kiwi

  • Bel Air kiwi Said:
Hi Airlifter, so there is some truth to the story.
It may well be something they discovered when they made the 53 updates. Those glides had the more conventional three element converter and revised operation so they would up shift from low to drive automatically. I wonder what they consider a long period is?

Cheers Kiwi


True and Gene Schneider has commented on it several times. If it comes from Gene it has gotta be true!


"PEACE IS THAT GLORIUS MOMENT IN HISTORY WHEN EVERY ONE STANDS AROUND RELOADING"

THOMAS JEFFERSON


 
Loren S 
Silver Supporting Member
Posts: 21
Loren S
Loc: NW Ohio, Northern Michiga...
Reg: 08-02-17
01-10-18 08:02 AM - Post#2720671    
    In response to 2blu52

Shepperd, to answer your question, fluid was not burnt. I was putting so much fresh fluid through the transmission I doubt it would look burnt even if there was heat.

Does anyone know where I might find a 53/54 transmission to overhaul and upgrade the performance of the car?

These are the "Good Ole Days:.


 
rrausch 
"14th Year" Silver Supporting Member
Posts: 13889
rrausch
Loc: L.A, Cal. & St. Louis...
Reg: 04-07-03
01-10-18 09:53 AM - Post#2720685    
    In response to Loren S

Most modern automatic transmissions do not lubricate in Park, and should not be run for long periods of time in P. When I had the 47RH O.D. automatic rebuilt in my '95 Dodge truck I had them drill a small hole in a specific wormhole in the valve body to allow it to lube in P. I've often thought the factories should have taken care of this, but evidently none think it is a big deal.

1953 210 Convertible, 261 with dual Carter YF 966S carbs, P.S., Remote Bendix P.B. Booster... shade-tree restoration about done.




 
Bel Air kiwi 
"3rd Year" Silver Supporting Member
Posts: 4328
Bel Air kiwi
Loc: New Zealand
Reg: 04-24-14
01-10-18 12:09 PM - Post#2720691    
    In response to Loren S

Hi Loren, The best place to get that sort of thing is when someone is taking out the old drive line from another car.
So around forums and clubs.
With Auto's its always preferable to have someone drive them who is very familiar as they are real hard to diagnose faults when not running.

Even if you get a 53-4 Auto it will still be quite sluggish. It will just start in low and shift to drive. The early one stays in the gear you select. So you have to do the 1-2 shift on the selector.

Have a good think about whether you are doing a restoration or making it more driveable.
Restored means authentic and that is a different path from a sympathetic but upgraded vehicle.
These vehicles respond really well to more gears whether they are manual or automatic. Its much kinder to the engines and can be a great way to improve economy and performance. Unfortunately that usually means an engine adapter plate, a modern 4-5 speed box and an open drive line.

Cheers Kiwi

48 3100 RHD, 51 Deluxe 4DR RHD, 51 Bel Air parts car, 52 Bel Air P-Glide LHD. Others 23T, 32 Tudor, 58 Edsel pacer 4DR HDT, 79 F250 351C RHD. 69,70,82 Capri. No mobile, no TV, and no Jap cars.

"They made a desert and called it peace." Tacitus


 
Gene_Schneider 
Ultra Senior Member
Posts: 12158

Loc: Wisconsin..USA
Reg: 09-27-02
01-10-18 04:20 PM - Post#2720709    
    In response to Loren S

Don't bother to look for a 1953-54 transmission. The difference in the mount and problems in hooking up the automatic shift linkage is not worth the trouble. With the present PG you can start off in drive for normal driving and shift to low mnually if desired. I seldom use low in mine.
Yes, in the 1950-1954 moels there is no fluid circulating in the trans, when in park. This means there is no internal lubrication to the vaious bushings and clutch plates. Also oil not flowing through the cooler is the fluid is over heated, What is a short time? I would say more than a minute or two.

Also when first starting the engine after it has been run for a week or so the converter will not refil when in Park or when adding a large amount of fluid.
This "problem" was eleminated in 1955.

ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible


 

Chevs of the 40s

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