Originally Posted by admranger

The jolt is common if you do 'rolling stops'. The trans normally takes off in 2nd gear. When you do a rolling stop and then press down on the throttle the trans downshifts to 1st rather abruptly.

My trans was replaced under CPO for this exact thing. Man, I hope it wasn't just a radiator issue...

If it were me, I'd do what JCL recommends above. The California Transmission Company (google it), has all the stuff you need for doing a trans fluid or fluid/filter change. They have quite a selection of parts too, if you get adventuresome and want to fix things inside the transmission.

Buy a new fill plug when you get your fluid/filter. Mine was not in the best shape on the rebuilt tranny they put in so having a spare is always handy.