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  1. B

    91 R2500 Suburban 4x4 4L80E hard shift/up down shift in 2nd/3rd

    It's a tbi 350. I actually found out after posting the original question, that the trans is out of a 98 truck, and it's in a 91. From what I've read in other posts, there's issues with pressures and or controllers when late models are used in early model trucks?
  2. B

    91 R2500 Suburban 4x4 4L80E hard shift/up down shift in 2nd/3rd

    I've got a 91 suburban 3/4 ton 4x4 with a 4L80E trans that just in the last 3 days has started shifting in n out of 2nd/3rd. Does it a couple times then drops into od fine. I've never had an electronic trans, always 350, so I'm not sure where to start looking. It's shifted hard, to me, since...
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