what transmission will fit in a 1999 GMC Sierra 1500 4x4 extended cab pick up. My trans went out yesterday and I found one and want to make sure it fits before I buy it.

50

Asked by Apr 07, 2013 at 04:55 PM about the 1999 GMC Sierra 1500 SLE 4WD Extended Cab SB

Question type: Maintenance & Repair

1 Answer

60

If you have a 3 speed transmission it would be 3L80/ or3 L80-hd. Four speed is 4L60, 4L60-E and4L80-E. Electtonic controlled transmission. Make sure the tail shafts are the same.

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