truck problems

[Blacklabel21]

Well i have a 1986 chevy s10 2.8 4wd .My problem is when i start up the truck and getting going it will shift from first to second with no problem but when it needs to shift to third it doesnt.So i will be in second forawile then it will shift or unless i sit at a red light for a few.Once i start driving it will be fine.Its kinda weird.The transmission came out of a 1989 s10 and i had ir rebuilt.Its a 700r4.I would to know what wrong with it so i can get it fixed before it starts to get cold out or bad weather.

[spideyjected]

Is the detent cable properly adjusted?

[Tink]

Will it go into 4th? How is the fluid - level, color and smell?

[Blacklabel21]

yeah it will go into forth.But if i drive it for a long period of time it wont shift into forth.I will hear it shift into forth but it wont stay in forth.If i drive it to work and back it will shift into forth with no problem.I wandering if its the kick down cable or tv cable.unless they are the same cable.

[spideyjected]

I'd start with the TV cable if the fluid is fine. Somewhere on the site there is an adjusting procedure explained...