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  1. #1

    Unhappy Changed the fluid, put in Lucas tranny fix; P1870 code came back...

    Just bought the Suburban and it had the P1870 code come on during the 80 mile drive home so I dropped the pan and the old fluid was incredibly bad; almost brown.

    Put in the Mobil 1 synthetic tranny fluid, new filter, and bottle of Lucas tranny fix. Light went off and it shifted like a new tranny. Not alot of clutch material in the pan nor any debris, so thought the fluid change would fix it, but the light came on after an hour of driving, and it started getting the hard 1-2 shift again.

    Tranny isn't slipping, so I don't know what is going on...

    I guess my next step is to install a shift kit??
    1997 K1500 Suburban, Mickey Thompson 15x8 rims w/ 33x10.50 BFG ATs, custom roof rack, Hella lights, 1.5" torsion bar crank, cold-air intake, MSD coil, Summit racing wires, More mods to come...

  2. #2
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    Did you change all 16 quarts in the tranny or just the 4or 5 in the pan???
    Mike

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  3. #3

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    Just what was in the pan...

    Guess I should disconnect the tranny cooler line at the radiator and pump all of it out...

    But that Mobil 1 stuff is spendy!

  4. #4
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    Oh i got ya.. i put in the cheap stuff to get good fluid in and when i change the filter after ive done the change i usually put in the good stuff, and i would be sure to do the lucas oil again.

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