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Turbo 400 question?

Discussion in 'Chevy Trucks' started by blzn74, Feb 24, 2002.

  1. blzn74

    blzn74 Member
    Messages: 45

    1981 Chevy 4x4 3/4ton.350/400

    Lately I have been delveloping a hard shift, after I have been driving the truck for a while, within normal operating temp, If I try to go into reverse it feels like it shifts really hard, loud noise, and a huge clunk! Only in Reverse though, and when the truck is cold it shifts just fine, any thoughts?
  2. John DiMartino

    John DiMartino PlowSite.com Veteran
    Messages: 2,154

    make sure the vacuum modulator is hooked up,and you may need a new one,it sounds lie its not getting vacuum or is bad.are your shifts a little late too?