hello i have a 727 in my 68 dart with the drive shaft on the car you can hardly push the car by hand but you take the drive shaft off you can push it with one finger. why is it so hard to push with drive shaft on ???????

Fresh rebuild?.
They can be tight, but that seems excessive.
Trans. car details?
New problem or 1st you noticed?
Seized rear support....?

My experience when it's been something like that is either the drums aren't aligned and seated properly in the sun bell, or a sprag issue. You didn't say if you've been running it this way or not. Usually when it's screwed up like that, you get 3rd gear and reverse.

every thing works fine . been in the car for years . you just cant push it very easy. shifter works fine and is going fully in neutral. fluid is red looks like new .

My cars the same way .
I never really worried about it .

My car is also very difficult to push and if it is in the air the tires are hard to rotate. But the transmission pan is clean and it drives fine down the road. All gears work like they should. I think there is just a lot of friction inside a fresh 727.

Something is amiss, I fear
All the good race 727 I've owned and race would push backwards harder than forward but none of them did what your talking labout
It is talking to you, now is the time to find out what it is causing that

It's normal for the car to push harder backward than forward but hard to push in both directions points to tight clutch/band clearances. This won't noticeably effect the operation of the trans.

Have you tried removing the driveshaft and testing? Rule out the rear brakes and a bent housing. Just a thought.

Me thinks he did that already

You’re right. Don’t know how I missed that.

yes i checked it with the drive shaft out . the trans works great but i guess i just noticed it was hard to push with just me pushing it by hand thanks

Your just getting old.

If YOU live long enough you will get OLD also
Nothing wrong with living a good, long life