Just to alert anyone who may use the Wix 57701 Trans filter for GM 1000 series Allison Trans (GM PU's) that I got 4 of them that are no good. They all got defective threads and will not spin on the transmission. They go about 1+ turn and become tight. One filter has squiggles in the thread and the other 3 just have bad threads. So be warned about Made in China Wix Hydraulic filters. I will try to take some photo's of the problems when my battery charges back up but its hard to seen the problems so the pic may not show any anomalies. We had to run to the GM dealer and get an AC Delco to finish the trans oil change. My bud was heading 500 miles to Detroit tomorrow to get on his oar boat.