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'83 Suburban Transmission Problems

Discussion in 'Chevy Trucks' started by Wally3128, Jan 31, 2006.

  1. Wally3128

    Wally3128 Junior Member
    Messages: 28

    Buba's '83 Suburban, 350 engine, lost 2nd and 3rd gear ??? Clear out of the blue. No sliding in and out...just 1st, n, and R. When you think it should it should shift...it don't. I think it may be a vaccum or the modulator.

    Where is the vaccum line attach to the transmission and where does it go to???

    The idiot that had the vehicle pulled and plugged most of the vaccum lines!

    Thanks for your help in advance...You guys have never let me down!!!

  2. NJBuickRacer

    NJBuickRacer Member
    Messages: 59

    The modulator vaccum line goes from the right side of the transmission up to the intake manifold. It's a metal tube with rubber junctions on the ends. My trans acted similarly to yours for about an hour this morning, then completely died. Got it to the shop, pump and converter are toast but the clutches and planets were OK. Should be back on the road tomorrow:D
  3. crete5245

    crete5245 Member
    Messages: 61

    First what tranny. some of the 2wd had 700r4, others either had a turbo 350 or 400. In the later case the vacuum modulator would cause it not to shift until very high speeds.. If it is the 700, it might never shift.. the 700 has a cable that runs to the carb, TBI throttle linkage, make sure that did not break or come lose... It has a critcial adjustment to make them shift correctly.