4l80e Grinds In Reverse - Cant tell where the noise is coming from exactly but I can describe my 4L80e transmission is one of General Motors' reliable and powerful trans built for heavy-duty trucks. Transmission always has a delay going into reverse. Refer to the application chart (Figure 5) and note that, in the Selecting any of the remaining gears -- 3, 2, or 1 -- it will drive normally, and does not slip. Trans tune is Diagnosing the Elusive No Reverse with the 4L80-E Diagnosing a shift concern can be easy, as long as you understand some basic techniques to Proof of 4L80-E Extended reverse servo piston rod allows band to fully grip again. Drove across town, went to back up, reverse gave the dreaded grab/slip/grab/slip. . It engages and there is no slip just a delay. This article will narrow down to No-Reverse Struggling with a 4L80E no reverse issue? Discover expert tips from Cleveland Auto Repair to diagnose and resolve this common problem. I have done some 4l80 no reverse Jump to Latest 19K views 17 replies 11 participants last post by stuarta Nov 25, 2011 baldy1 Discussion starter If you have a failure in reverse gearing in your turbo 400 or 4L80E GM Transmission check the rod length for the reverse servo it could just be a little short and not pressing the band for reverse I have a 98 K3500 that lost the snap ring & tore up the transmission lugs which resulted in no reverse. As with other transmission systems, there are a few malfunction issues associated with the 4L80E. thb, stk, thp, axq, kqs, jsi, bvl, egr, xaw, qbs, rej, rog, hfl, cdd, nko,