1999 1500 sub trans

Asked by Oct 17, 2012 at 01:22 AM about the 1999 Chevrolet Suburban K1500 LS 4WD

Question type: Maintenance & Repair

I have a 1999 1500 4x4 suburban. When first put in gear it hits hard, like its in low range. Then you
accelerate and it goes but then starts to slip, revs to 4-5 k then let off and it grabs second hard! This
continues through all the gears. I'm thinking pump?? but I am not sure maybe sol. any help??? thanks

2 Answers


Four possibilities: 1 the filter and fluid need to be changed, if the filter is clogged it causes the slippage. 2 either the governor is modulator valve are clogged or faulty. 3 Worst possible cause is the Torque Converter could be bad. 4 Of course there is the possibility of the clutches and gears being worn but that is less likely than one of theothers

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Also a possibility of the throttle position sensor being set so the computer thinks its throttle is open more causing hard shifts. The hard shifts could have broken a motor mount if it went on for too long.

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