My van did the same thing. A rough shift into second.(and also 4th). I took my chances and replaced the solenoid pack. It shifts smoothly through all the gears now. I can't promise you that it will help yours, but like andy said, with that many miles it wouldn't hurt, and it helped mine.
2001 Infiniti i30 3.0 DOHC V6: VQ30DE 177,000 miles; 1999 Nissan Altima GLE KA24 168,000 Miles
1997 Dodge Ram 1500 SLT Laramie 5.9 46RE, 182,000 Miles
Prev. 97 T&C LXi 184k 3.8, 94 T&C 3.8 156k Miles, 93 GV LE 3.3 123k