backyard mechanic 469

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Question Asked: engine replacement leads to no 3rd or 4th gear ?
December 06, 2012, 02:33 PM
i just put a new engine in a 1999 gmc yukon denalie it has a rebuilt transmission with less than 500 miles on it , i left the tranny in the truck dureing removeal and installation of the engine i have checked for broken wires with no luck and nothing is unpluged 1st and 2nd work fine but when it shifts to tird it's ike yo put te truck in neutral any suggestions ?
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