727 3rd Gear Upshift

[Rick62]

I posted this on another Mopar website: Suddenly the 727 in my pickup is not shifting into high gear. First to second is normal around 15mph unless I accelerate hard. Normal acceleration or otherwise it doesn't shift into high gear at all. It stays in second. I haven't changed anything recently. The kick-down linkage is attached and adjusted to be all the way back when the throttle is at wide open, which is where it has always been. Any clues? Thanks!!

 

[mopar 3 B]

Front clutch pack is gone if everything else functions as normal.

 

[Aeronet]

Did you have a flare up on the 2-3 shift before it quit going into 3rd?
That's what mine did. Flare up, then no shift, lost 3rd. Worked fine otherwise. Took it out and overhauled it. Front clutch pack was burned up.

 

[Ernie ingling]

Agree tuff brake but 727 not to difficult to rebuild

 

[dvw]

I've had some that the surface finish on the inside of the high gear clutch piston gets burred. It won't flare. But it won't shift 2-3 either.
Doug

 

[Moparnocar]

I've had some that the surface finish on the inside of the high gear clutch piston gets burred. It won't flare. But it won't shift 2-3 either.
Doug

I had 3rd die on me. Front clutch was at maximum spec, had to rebuild, and do thicker snapring

 

[Rick62]

I'm going to try unhooking the kickdown rod and see what happens. It sounds like the trans is going to need to come out. I'm not looking forward to that, I'm old. The motor and trans in the truck are a 440/727 from a '72 Chrysler. Both were rebuilt when they were installed thirty years ago.

 

[dvw]

I had 3rd die on me. Front clutch was at maximum spec, had to rebuild, and do thicker snapring

This would cause a flare, like going into neutral. It is possible the 2/3 shift valve is stuck in the valve body. Also possible its a governor issue.
Doug

 

[wyrmrider]

how much crap n the pan

 

[Rick62]

how much crap n the pan

I haven't checked yet but that's a good place to start,

 

[oldkimmer]

Is the fluid level correct? A seal could be gone in the front drum or a sealing ring on the pump. Or other scenario’s as posted. Kim