Lock Up Torque Converter

By thebandnerd03
February 5, 2011 in 1988-1999 Chevrolet & GMC C/K GMT400 Platform

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thebandnerd03

Posted February 5, 2011

Ok i have done some looking around on the site and cant find anything on this. I have a 89 ld2500 with the 350 and a "4speed" 700R4. now i know 4th gear is actualy just the torque converter locking up for overdrive but why would this cause the truck to run rough. if i stick it in drive i have no issues with it. In overdrive if i try to hold speed around 45 it runns really rough and struggles untill i giv it gas or back off to less then 40. any ideas?

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