1994 Bonneville SSEi 180,500 miles.

Some more problems have begun to occur with my dying transmission!
Anywhere between speeds of 70 and 90 at WOT my transmission seems to be cutting in and out. It lurches pretty bad at these speeds. I am also still having shudder on take off when it is cold and the trans seems to be doggy at low rpms. I am still wondering if this is for surely a transmission problem and not something to do with the torque converter.

If I do need to get a new transmission where would I go about getting a refurbished for a decent price with a new torque converter?

Thanks
Josh

Did I miss something? Do we know it'* tranny? When was the last time you did plugs and wires?

It is most definetly the transmission or torque converter. The engine runs great, I put TR 55s in it about a month ago. It doesn't miss and is really responsive. I have asked about this a few times on here but I guess I don't know enough about the torque converter to distinguish whether it is that or the transmission.

It'* pretty hard to diagnose this one without doing some checks on the transmission. First thought that comes to mind would be the line pressure comming off the pump. If you have low line pressure, then it can't hold the gear selected. It will also have sloppy shifts since the bias pressures in the valve body will be whacked out and not slide the valves, even with the help of the kickers.

Torque converters are tough to kill without spinning them up to un-godly rpms. The TCC circuit can fail (and probably has if you have line presure problems) but it usually exhibits itself when the engine rpm starts yo-yo-ing 100rpm at steady-state cruise on light throttle only.