5hp18 on BMW 530i slips

[mechaman1]

Hello everybody!
I have 1994 BMW 530i with 5spd 5hp18 autotranny. It slips in first 1-2 and i believe 3 gears but drives good in 4 and 5. I just drove it for 400 miles on the highway. It slips really bad when takes off. I have to push accelerator really really weak untill i gain 30-40 mph and when higher gear will kick in and its fine. I couln't find any information regarding testing 5hp18. I want to test wiring harness, sensors and solenoids also perform pressure test before ordering rebuilt kit ($546 dollars).
Where i can find this information? I looked through Mitchell Transmission Service and Repair book. It doesn't say nothing about 5hp18
sincerely,
Akmal

[632 Regal]

have you changed the fluid and filter? if it was never changed it could be partially clogged and driving it like that will smoke the clutches resulting in either a replacement or complete rebuild.

[mechaman1]

When I bought the car the owner told me car has tranny problem. He changed filter and fluid. I looked at clutch and band application chart it seems more like electrical problem.