98 580 sl

I have about 4200 hrs on my machine ive had it 10 years, it seams to have less forward and reverse power, very noticeable change over the last year, ive also bean having trouble with it having a lag before engaging into gear after running it for a while. it went completely out about a year ago and we replaced the forward and reverse solanoids on top of the tranny I believe it was, and one other issue is the ebrake doesn't work very strong any more, I would appreciate any feed back or help I can get in diagnosing these issues
Thanks

98 580 sl