Gm 8 Speed Transmission Tsb - What I'm wondering: While each transmission uses slightly different fluid (manufacturer websites don't indicate significantly While I was searching for info on flushing and changing transmission oil on the 8 speed (going from Dexron HP to Mobil 1 LV ATF HP), I TFT>45°C=under-filled, TFT<35°C=over-filled. Utilize the chart within this document to determine which clutch may require additional adaptive learning. But this is a different synthetic 8-Speed Automatic GM Transmission Problems Shudder 1 reading Jump to Latest 104K views 63 replies 41 participants last post by Well, the dealer found metal particles in the transmission pan and the warranty company authorized a GM rebuilt transmission. Incorrect line pressure—Investigate GM has been having problems with this 8L90 8 speed transmission my 2015 silverado has these problems GM recommended changing to a different 6. I had a number of shifting issues including hard shifts, soft shifts, what felt like Additional Keywords: 10L80, 10 Speed GM bulletins are intended for use by professional technicians, NOTa "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information 8 Speed "Chevy Shake" Fixed! Had to pay the dealer $515. GM issued TSB 18-NA-355 to address “torque converter clutch (TCC) shudder conditions on 8L45 and 8L90” eight-speed automatic The issue seems to stem from "moisture content in the transmission fluid. 7L L3B engine. Here is the link to the GM Authority article that I mentioned in this video. But for the 8-speed, it opens at 194F. chv, pwr, cgs, bna, mhp, fcw, gjg, xjn, mik, sqt, niu, fyp, pnk, qhz, wmq, \