New here, question about Buick Dynaflow

Well, I'm new here. I own a '55 Buick Special. 100% original and everything functions properly. That will probably change soon.

My question is when I put the dynaflow tranny in "D", it slips if i give it to much throttle, so I feather it to get it up to speed, but after about 1/4 mile of letting it warm up, it runs just fine.

Here are a few pics of my ride.

 

Does it have the twin turbine torque convertor? it has been so long since mine was stock I forget how mine was set up. I know the twin turbine setups would actually go to a high stall convertor mode if accelerating hard from a stop and sometimes engage if accelerating hard while driving. This is what made many people think the transmission actually shifted from low to high in "D" range. Actually, the transmission starts out and stays in Direct/Drive if "D" is selected, but may make use of the variable stall convertor. Buick later called this the 'switch pitch' feature in the early through late 60s.
One way to get a rough Idea is to floor it from a stop, if it is infact slipping, the car will rev up but not go anywhere, if it is in the variable stall mode, the car should take off fairly hard although the rpm is up there. My pops '61 LeSabre is this way.
Good luck, If you need any help I can dig out the service manual for more info.

PS, since you only paid $100 off ebay for it, how would you like to make a quick 100% profit???? ha ha ha.

 

The Dynaflow in D is a single speed transmission with a variable torque converter. It is not dual range but truly variable. The switch pitch has two stalls and is a totally different animal.

 

i put a post up a while back the same symtoms however my 53 buick had a three on the tree.a old time buick rodder sugested i check my fuel pump i thought he was hitting the juice lol after two weeks later i replaced the pump it has run great ever since GOD BLESS THE OLDTIMERS

 

? huh ?

 

When I put in low "L", even before warming up it takes off just fine and then when I get up between 25-30 mph I put in in "D" and everything is good. Its only when I leave the driveway in the morning in "D" when it seems like it slips. Do you need to let the transmission warm up before you drive?

 

May be high accumilator (bolts on side of trans) leaking internally, it will cause that problem. It didn't damage my trans just a early morning pain. Check the ajustment on the linkage to the carb from the trans and make sure your motor mounts are good.

 

I drove a 53 buick woodie all through high school.The only way to pull out was to start out in low and then shift into drive.It had something to do with the pressure made by the fluid pump in the trans.