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Hard Shifting 4L80E

charp1824
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charp1824 Enthusiast

charp1824

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I just replaced my rear main seal and obviously you have to remove the transmission. After I got everything back together, I drove it around and noticed it shifts hard now. When I put it into gear it spits and sputters and eventually will die and it idles perfect. Never had any problems before shifted great and ran great. it seams shifting into 4th gear is smooth and normal but not the other gears. What could it be? Something electrical?

 

04 GMC 2500HD 6.0L 4L80E

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