727 Converter Drain Back

[DART505]

My trans always has one drop hanging when it sits for a few days. Well when it sits for a month or longer it has a few drops not from pan gasket, pump seal or dipstick tube.
I did find a small leak thru center of yoke not tail shaft seal which I'm getting ready to do a new 1350 chrome molly drive shaft with new yokes so that should fix that part. It has a deep pan Under filled by a quart but I see people talking about converter drain back. In 50 years of these 727 I never had this issue.
Wtf is going on and why ? If it is the converter draining back why would this be a issue I never had before and what is the fix ??
Thanks for the feed back.

 

[pnora]

Drain back is not causing a leak. All transmissions have a certain amount of drain back when sitting. With drain back the chance of a leak increases do to a sealing problem. So locate your leak and fix it.

 

[4mulas]

My trans always has one drop hanging when it sits for a few days. Well when it sits for a month or longer it has a few drops not from pan gasket, pump seal or dipstick tube.
I did find a small leak thru center of yoke not tail shaft seal which I'm getting ready to do a new 1350 chrome molly drive shaft with new yokes so that should fix that part. It has a deep pan Under filled by a quart but I see people talking about converter drain back. In 50 years of these 727 I never had this issue.
Wtf is going on and why ? If it is the converter draining back why would this be a issue I never had before and what is the fix ??
Thanks for the feed back.

I had the back of my yoke leak too where the button is. I just cleaned the heck out of it with brake clean and then made a small tool out of a kitchen spatula and use the right stuff in the bottom of the yoke to seal it. Did the back side too. Leak fixed.

I think when they make the yokes the button ahs a sealer on it, but after 50 years it can crack and come out causing possible leak.

My converter drains back quite a bit after months of non use or lack of running the vehicles.

 

[dvw]

Trans Go, Sonnax make a repair valve to limit drain back.
Doug

 

[khryslerkid]

I had a 2003 Hemi Ram that had drain back periodically and it overflowed the dip stick tube. Had to leave it a pint low.

My 2003 Dakota 4.7 doesn't always have reverse when you first start it. I do the place it in neutral for a couple of seconds before selecting reverse.

 

[Dan]

Converter drain back can be caused by a loose bushing in the trans pump.