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Username Post: Powerglide Transmission Leak        (Topic#367466)
Impala_Mike 
Member
Posts: 222

Loc: Emmetsburg, Ia
Reg: 12-15-01
01-16-22 10:43 AM - Post#2834636    

My original Powerglide leaks transmission fluid after setting for an extended length of time. I have been told this is a common occurrence with this transmission.
I was also told if I start the car every few weeks that it would keep the fluid from pooling and leaking and this seems to be true. Other say drain about 3qts of fluid out before winter storage and that would stop the leaking.
I would like to not have to do either so I am curious if a transmission like a 2004r would have the same issue if it sat for a few months over the winter.

Also open to other options for the fluid leak.

Thanks, Mike

1964 Impala Convertible 327/250 Goldwood Yellow AT,PS,PB,AC,Tilt,AM/FM,Power Seats.


 


Tony1963 
Frequent Contributor
Posts: 1281

Loc: Orlando Florida
Reg: 07-09-18
01-16-22 10:49 AM - Post#2834639    
    In response to Impala_Mike

On the two that I had of this vintage with Powerglides, I found the leak coming from the oil fill tube seal.

When the vehicle sits, fluid drains out of the converter and into the case. It gets high enough to leak through the drain tube seal.

Pull the dipstick tube, clean everything up, install a new seal and you're good.



 
Impala_Mike 
Member
Posts: 222

Loc: Emmetsburg, Ia
Reg: 12-15-01
01-16-22 10:55 AM - Post#2834640    
    In response to Tony1963

I will look at that this spring.

Thanks, Mike

1964 Impala Convertible 327/250 Goldwood Yellow AT,PS,PB,AC,Tilt,AM/FM,Power Seats.


 
impala62 
Poster
Posts: 91

Age: 53
Loc: The Netherlands
Reg: 04-02-07
01-17-22 02:31 AM - Post#2834685    
    In response to Impala_Mike

in my case (aluminum powerglide) it leaked at the speedo drive.
Only after standing for some time.
Replaced the powerglide speedo drive housing (bullet)with a TH350 bullet that has an extra seal on the speedo drive.

Just remove old one, remove speedo drive, put old speedo drive in new bullet, check if seal rides on speedo drive (if not push in some more) instal bullet.
No more leaks for me.

Ronald

1962 327 4 door hardtop
1967 opel kadett 1.2ltr


Edited by impala62 on 01-17-22 05:07 AM. Reason for edit: No reason given.

 
Impala_Mike 
Member
Posts: 222

Loc: Emmetsburg, Ia
Reg: 12-15-01
01-17-22 09:26 AM - Post#2834702    
    In response to impala62

Thanks for the info. I would not have thought of that as a leak source.

Mike

1964 Impala Convertible 327/250 Goldwood Yellow AT,PS,PB,AC,Tilt,AM/FM,Power Seats.


 
sanee64 
Contributor
Posts: 152

Loc: atlanta ga
Reg: 04-05-18
01-17-22 03:53 PM - Post#2834733    
    In response to Impala_Mike

great info as mine mine is always "wet" underneath but level is good. granted that still drives me nuts.



 
oz61 
Newbie
Posts: 3

Loc: Australia
Reg: 09-29-15
02-01-22 07:14 PM - Post#2835574    
    In response to Impala_Mike

I think they can all leak from the filler tube seal or the TV cable seal. Especially when over filled like some do with the 200-4R for racing.
200-4R is the perfect swap if you want an overdrive. Same length as the PG. The 700r4 3.06:1 first to 1.62:1 second gear shift is a bit wider than the 200-4R 2.74:1 first and 1.57:1 second. OD is slightly taller at .67:1 compared to .70:1 for the 700r4.

1961 Impala hardtop RHD EXPRD Canadian build. 350 roller alloy heads, TH200-4R and 3.73 Eaton posi.


 
Impala_Mike 
Member
Posts: 222

Loc: Emmetsburg, Ia
Reg: 12-15-01
05-16-22 11:36 AM - Post#2841281    
    In response to impala62

Just wanted to post a follow up on my transmission leak.
Impala62 nailed my problem! I replaced the speedo drive housing and speedo gear as suggested and my leak is gone.
Should have ask about this years ago as it had been leaking since I bought the car. No more cardboard on garage floor.

Thanks for all who posted potential fixes.

Mike

1964 Impala Convertible 327/250 Goldwood Yellow AT,PS,PB,AC,Tilt,AM/FM,Power Seats.


 


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