My 3 speed auto leaks after sitting overnite from the rear seal area. It used to leak after sitting for several days. The last time I thought the seal was leaking so I pulled it apart and discovered that the fluid was coming from between the splines on the output shaft and the yoke. I replaced the seal, since it was exposed anyway, and applied a heavy grease to the splines. That helped for a couple of months but it is leaking again. Looking at the schematic I assume that fluid should never get to a level that would leak from the splines. I am guessing that the fluid is draining back from the converter and causing the trans to be overfull, Thats just a guess. The trans checks a little low, but not down to the add mark when I check it. If I start the engine at least every day It doesn't leak at all. What do you guys think the problem is? Where is the check valves for the converter? Is it on the converter or in the valve body? Anything else I need to be looking at? If Dodge would have used a solid yoke instead of a yoke and nut this would not be a problem. Other than this the trans seems to be good. It was rebuilt before I bought the truck I think. The trans is spotless and the fluid looks good. Thanks for any help.

 

Just a couple thought........are you checking it in neutral?
is the dip stick the original one?


If the spline is held on by a nut then all you need to do is put silcone on the splines and the nut........after you clean them up, with brake cleaner or some thing sim, to get it dry! it will seal it up nicely.

 

Yes to the neutral and I certainly hope so on the dipstick. We had Dodge Diesels in the Air Force Reserve and one day I was checking the vehicles To get ready for inspection and found that the motor pool had serviced all of them checking in park. Came to find that very few people know to check a Dodge in neutral. I didn't use silicon when I reassembled the trans before due to the yoke having to flex in the trans slightly due to terain and torque. Do the later transmissions still use a bolt on yoke or are they solid?

 

thats what i'm wondering, if it has a nut, then do as I have wrote, if the splines slide in and out as you drive(no nut holding the yoke in the splines then disregard preave )

what i'm trying to say is is the slip spline on the trany shaft or is in on the drive line.......Have a standerd and just don't now?

 

I seem to remember reading about a service bulletin that talked about adding a checkvalve in the trans cooloer line to prevent drainback into the trans.

 

The yoke is held on by a nut, however the nut torques against a raised shoulder on the output shaft not against the yoke. There is probably several thousandths of an inch movement on the yoke just like a solid yoke would move on the shaft as the driveshaft flexes. There should not be much flex though with the short space between the trans and the carrier bearing.

 

Thanks Jim. I'll try to find the info.

 

So on the ether side of the carrier bearing there is a slip spline?

 

I'll have to look at the carrier tomorrow. I seem to remember the carrier being splined now that you mention it which would allow the yoke in the trans to slide more than I thought it would. I do know that there is a slip collar behind the carrier.

 

Then you should be able to atleast silcone the nut and retork it!
the only thing that i would causin you on is that the tranny will not tolerate any silcone in it system so just keep this in mind when you put some on the splines.....a little go's a long way!