Drive is not working
I got a 78 K5 Blazer for Christmas. Cool huh, new paint and 76,000 miles. The car sat for 11 years and we knew the tranny stuck a bit. Well it is very hesitant in going into drive and pops out easily. It seems to go in when cold, but once warm, it won't. 1st, 2nd, and reverse are all fine, and shifting is great also. Is there anything I should check? Oh yeah this is a TH350 bolted to a 400 and is a 4x4 with a NP203 transfer case. I do plan on changing the fluid and I hope i don't find chunks just wondering if there is anything I can check or fluid I can dump in.