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Hello, I need to replace my rear U-Joint on my 57 Century 4dr hardtop and I am looking for a replacement as this one is shot. What is the current model number to replace this U Joint? I have searched and a 534G or 234 was the replacement part, but the cups are too big. We went to the parts store with the old one and measured it and nothing matches. If anyone knows, please let me know. Thank you, Jason

Thanks for all of the replies. I'll be putting it back in. Now time to swap out my wheel bearings. Replace some oil pan gaskets, and any other leaks that I can find...

Awesome, thanks! There is no play in the twisting of it. so I'll leave it as it is.

Oh wow really? I took it to an old school mechanic and he's never seen this before. I have the Dynaflow transmission. Does anyone know where I can source parts for this? I cannot find this U joint anywhere.

Hello, 1957 Buick Century I have a question about the front U Joint in the Torque Ball. Is the U Joint supposed to slide up and down and side to side within the yoke? You can see in the first image how the U joint sticks up, and then second photo it doesn't. Is this normal? I have attached some images.

Hey everyone, I've made it to Montana two days ago and having a great time here. Tomorrow we are departing Butte and should arrive mid-afternoon at the hotel in Spokane Valley. See you all there!

I'll take a look for an access port on the rear end. My vibration is happening while not moving at around 1380rpm. It is not as severe the last couple of days once I changed the fuel filters, re-tensioned the belts, and adjust the choke and idler screws. I am traveling for 3 hours down to Calgary, and picking someone up, then continuing on. If the situation gets worse I'll bail on the Buick and drive down in a Honda 😳.

I am going to put some miles on it this week and see what happens. I also used some carb cleaner to clean up the sinuses of this old girl. I also need a new rad cap. If it's not one thing it's another... From my most recent test drive I think it will be ok for the drive from Alberta to Washington state. We are going to take the scenic route through Montana starting Sunday and spend a few days there before we end up in Spokane on Wednesday.

Just an update, I adjusted the carb to run richer than it was, and opened up the idle screws 1/2 turn. Took it out for a run and it is smoother than what it was before. Tomorrow I am going to pick up a new fuel filter and swap that out.

Ok everyone, with help from Matt from Centerville Auto, this is what I have determined. After some digging I believe it is a 59 or 61 - 401 with 364 Heads. So here are some numbers Block Cast - 1196546 - (61 - 401) Intake Manifold - 1185976 - (63 - 401) Head Cast - 1172889 - (57-61 - 364) And the balancer is for a 364, which it had on it for the last 35 years without an issue. Now I am debating on whether or not to switch it to a 401 balancer, even though it did run smooth with this 364 one. I am planning on going to the BCA show in Spokane, WA and was planning on leaving this Saturday.

Ok, so I measured the weight on the balancer. From what I read, find the center mark and then measure counter-clockwise until you get to the weight, that measurement is 7.25". That is the distance for a 364... I was told that I had a 401 because my water pump is the long one. I measure the distance between the two intake bolts and it is 9" which is an indicator that it is a 401 as well. So maybe my weight spun to the exact distance of a 364? or this Buick has had the wrong balancer for the last 35 years and ran smooth until last month. I am getting my information from - https://www.nailheadbuick.com/post/balancer-info Here is an image of the cast numbers at the front, starts with letter C I've attached a photo of the number on the upper block by the firewall.

I checked the three mounts and they look good. I'll try adjusting the carb and see if that changes the vibration at certain RPM's

I'll reach out after I try a couple of things and fail, thanks

Honestly, I do not know the exact flexplate. I believe the 401 came out of a 62-63 and mated to the original 57 Dynaflow. This vibration is a recent issue, it has been running fine for the last 35 years.

I read on another site that the distance from the timing mark to where the weight start (going counter clockwise) should be 5in on a 401. Tomorrow I'll try to located it and measure it out.... never done this before. Ah, the adventures 😊