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Message: <blockquote data-quote="JamesTheDenali02" data-source="post: 25286" data-attributes="member: 11709">I have a 02 Yukon Denali XL with the 6.0 lq4. I've been having a weird shudder when it tries to come out of lockup or shift down that almost feels like axle hop or something! I had a 4l60e in, figured it was the converter, and swapped it out along with a spare 4l65 out of an 04/05 Denali with full flush, new filter, and swapped my 2-4 corvette servo in. When I got the spare, I noticed it had fluid coming out of the pins on the large round plug under the lines on the passenger side. Because of this, swapped the internal harness from old trans to new one. Its running, driving, and shifting well, but I still have that weird lockup shudder! Rear end? Lockup solenoid? Bad luck and another junk converter?UPDATE!! Was still having problems with the part throttle shudder at that certain speed, and on the scanner everything looked perfect transmission wise, so decided to move to engine data. No set misfire count or codes, but with a passenger looking at live data while doing the bucking, cylinder 3 misfire was all over the place, only under part load at that certain speed. After further inspection, plug was cracked in cylinder 3. That was the entire problem, now runs and drives perfect. Stupid mistake, but so glad it works. (oops)</blockquote>