Hey Guys and Gals here’s what I got: 1986 Chevrolet K10 4 X 4, with a 700R4 4 Speed Automatic, NP208 Transfer Case, GU6, 3.42 Locking Differential Rear End, on 31-10.5-15 tires with 3500# Overloads and a Class IV Receiver Hitch. It originally had a carbed 305 w/AC but was later changed to a 350 w/AC back in 2004 just before I bought it. I recently blew the 350 and dropped in a brand new 350 H.O. Turn Key w/AC from GM and she runs like a scalded dog! However…. since the new engine has no emissions control parts and I no longer needed the ecm; I disconnected all the vacuum lines to include the tip in switch. There is a vacuum switch behind the brake booster as well but it has never had a vacuum line running to it so I left it that way. I cannot figure out why the tranny has no kick down. I hooked the TV cable up correctly (?) and she’s hitting all four gears at the right spots, but still no kick down and stalls sometimes when I stop at red lights and stop signs. I researched it and sure as 5%*! the vacuum behind the brake booster is part of the torque converter lock up system. I could not find any diagrams to show how the vacuum switch is connected so I took it to the transmission shop and the guy says the valve body is probably sticking and there is probably a torque converter issue as well. He says without tearing it down first he can’t be sure. He is also going to price me a total rebuild with upgrades. Any expert advice would be greatly appreciated!!
1
