460le

[TimRandich]

I have an automatic that slips when cold and hot, are there any adjustments I can do, such as band adjustment, or any additives that might help.

This is my first post, please don't ignore me...

[performabuilt]

if the transmission seems to work ok other than that and the fuild is not burt excessivly , I would try replacing the (pcs)preasure contol solinoid first,

performabuilt

[2001NBMZ28]

Is your SES light on? If it's slipping should be throwing a code.

[performabuilt]

Actually It might not set a code in lower gears since the pcm allows fo converter slip and the 4l60e only looks at engine rpm and output speed, Also it will not set a code for pcs either unless its electrically faulty, The pcm has no feedback from the pcs for a mechanical fault , Now it theres excessive slipage in 4th with lockup converter engaged you may get code 1870 (componet slipping).I would suggest changing fluild and turn the preasure up a little as i mentioned earlier and then start looking for a transmission,

performabuilt

[TimRandich]

Thanks for the replies, I have recently changed the fluid and noticed black residue on the bottom of the pan., Looked like rubber and wiped off easily. The fluid is good. No Codes and I do not have an SES light. The Shift from 1st to 2nd is now harsher than it was at light throttle.

Can I adjust the bands or add an additive to get it back to normal?

[performabuilt]

I would change the pcs as i suggested earlier , additives make little or no diference