95 Ford Windstar Trans Jump

When the transmission is cool shifting from 2nd to 1st is smooth but after a while of driving the shifting from 2nd to 1st when slowing down and stopping makes the van jump a lil for a secound and i'm not quite sure what is causing it i was thinking about flushing the trans and ading new fluid but i'm worried that the trans might not like it and mess up on me plus my WS has 150,000+ miles on it. Can anyone suggest something.

P.S. it shifts just fine to and from any other gear but jumps just once when i put it into drive from park or on a hill from park to reverse.

Also i now have pics of what the fulid looks like and what i'm going to add and i would like suggestions on what to add i was thinking of Trans Honey or Lucas Transmission Fix and i don't smell any burning in the trans fluid.

Pic of Transmission fluid color:
http://www.antonyfreeman.com/ws/fluid.jpg

Pic of Trans Honey :
http://www.antonyfreeman.com/ws/additive.jpg

Fluid looks less red than mine, (95, 3.8 160K mi). Have you ever changed the fluid, or filter in the transaxle pan? If not CHANGE IT!

I would try replacing the neutral saftey switch on tranny, it does more than just prevent starting in gear, may post say it fixes tranny problems,
see my previous post on website where to buy.

I've only had this van since jan 2005 and i've put 10,000+ miles on it i've changed the oil 2 times and have not changed the trans fluid yet going to later today.

Well 1,000 miles later and it still jumps when i stop real quick before it switches back to first gear after i push on the gas it rev the engine just a tad then jumps into first but when i come to a SSSLLLLOOOOWWWW stop it has time to switch to first and most times i don't feel it switch so i'l thinking it could be a senser or the timming. any suggestions?

well after looking in the Haynes Repair Manual for Ford Windstar 1995 thru 2003 i see its list two sensors for the transaxle (1. Transaxle Range Sensor) and (2. Vehicle Speed Sensor (VSS)) any one this these could cause that if i cant find out witch one i could be i'm prob going to replace them both but i would like to get suggestions on if its one or the other?