Hey guy's, yep fresh rebuild by my regular guy never had any issues before with him. new 9.5 converter i had Lupo make a couple of years ago just got around to installing this week did the install like normal put my fluid in fired it up in neutral ran it through the shifter positions back to neutral topped it off enough to test it and i have reverse but nothing in 3 2 1 re checke fluid added a bit more just in case still nothing. stock floor shifter in an a body checked it a couple of time to be sure it was adjusted right kick down is on and set. any thoughts before i call my guy?

Most likely a rear clutch issue or the rear clutch sealing rings. Unfortunately, there's probably a good chance the trans will have to come out again. Did the builder check the clutches with air during assembly?

i have a feeling it could be something with the input shaft. the trans is a 78 from an e58 cop car no lockup and had a shift kit in it before, i ran it for years till it got a little soft then pulled it. upon inspection it needed an input shaft so i brought a core trans from my barn an he built it up from there. it seems to me there was change in that area around that time. i hope he did not miss that? but i will pull it to make sure. sucks but it is what it is.

x 2 .... probably blew out the rubber rings ... should have used some ATF with that air check

A mismatch of the input shaft and/or the reaction shaft support is a distinct possibility, they changed the rear clutch apply circuit in '78.

after it did not work i read up on some possible causes and found that which made me think of what we did to it..... oh well i will pull it and we will see. i may just bring another one that i have and get it done too. this guy has built a lot of 727's for me with no issues so i can't complain too much stuff can happen. i will post back here once i know whats up i will try to get it pulled this week and get it to him before the weekend. i am trying to get this car done so i can store it for the winter as i need mu shop back!

Doc edumacate me on that if you would please, I have several 904's in the works.

Be careful what you wish for.

EGGuCATE RR ? ... lol ..... now a 904 I totally furrget but a 727 has a BIG RUBBER Oring that can roll over if tooo high of air pressure is used OR if it isn’t changed on a rebuild and is worn out or brittle from heat. Now HONESTLY RR .. I have not seen the inside of a 727 (I had to think about this) since 1996 ..,, damn 22 years ! ...

Now HAMma’ time ... jsta what does THAT mean ..

No! We would have never guessed...

Ahhhh ... my little PUPPY DOG is here

...and I’ll bet I’ve FORGOTTEN more about a 727 than you will ever know .,,.

I'm sorry I asked!

I don't know what you consider to be "tooo high" of air pressure, but I routinely use 90 psi for air checks theorizing that it's better to have a failure on the bench than in the car. And I add a squirt of ATF to the passage before air testing to ensure a better piston seal.

one time I assembled the rear clutch wrong and put the piston spring upside down = no forward gears

John you're the man (as always!) & that is what I was wanting to be edumacated on as I had completely forgotten about doing the air checks & I for sure want to know that everything is good (as much as I can) while I am still on the bench.

RR ,.. that’s basically what I said except I didn’t mention specific psi. And I have had a NEW seal roll over on a air and atf port fill check once.

Doc yes you edumacated me, I worded it wrong where it sounded like you did not contribute but you absolutely did. & Doc while I got ya on the line, I have this Motorhome here that needs a good home (it has your name on it!).

RR .... the WHOLE motor homey ? ... well FIRE that baby up and drive her down to the warm weather !!

Doc don't tempt me.