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Hi All

Sometimes when my 2.5L 2000 automatic Liberty changes up gears I get a loud thud and the vehicle is shunted forward. This started happening on odd occasions a couple of months ago and now happens most times i drive but only after the car has been running for a while (20 or 30mins).

Once the thud/shunting starts occurring it happens for the rest of the trip whenever the gears change up.

Every time this starts happening I also have loss of power at low revs (ie taking off from traffic lights).

I have checked the error codes and TPS codes shows up (No. 31). I have replaced the TPS but still have the problem.

Any Ideas?

does that model have bands in the gearbox ? if not try a transmission service

yeah, as muddy says, has it a service history? Filters can block up, fluid can change its working properties with age etc. lso sounds electrical too bad power or earth supply like crusty fusible link - had that in a falcon that gave wicked upshifts