Re: Bucking Slightly at Cruising Speeds

Posted by 53 Cavalier On 2024/7/28 15:50:29

I have a 26th series, 327 & Ultramatic.

Transmission:
Mine is also very leaky and I top it up as necessary. The low band operates independent like the reverse band, so it not working is probably not affecting high. Have you tried adjusting your low band? It's is rather simple and that may be all it needs.

Are you running Type F transmission oil? The Ultramatics, unless they've been rebuilt do not like modern ATF.

I would think you would be able to tell if it was your transmission slipping as it should do it under load, such as pulling a hill or giving it more throttle.

You could try adding some Lucas Transmission fix to see if it made any difference, but what you're describing doesn't sound like a transmission issue to me, but maybe.

Bucking:
I would be more inclined to think carburetor issues would be more prominent when the engine was cold, rather than when warm and cruising down the highway.

I recently had a similar issue, which occurred when warm, and was erratic. It ended up being a bad coil, which wasn't even a year old. Engine was fine when it was cold and started acting strange when it warmed up. The coil had leaked it's oil, which I discovered because my plug wires were oily under my coil. Replaced the coil and it's been good ever since.

Those are my only thoughts at the moment....