No, the ratio codes are from internal slippage. 94's had several weaknesses that got corrected in 97+ versions of the 4L80E. If the PCM/TCM puts the transmission into "limp mode" with full line pressure, it was not uncommon for that to cause the Reverse Band Apply Piston to either blow out the face of the piston and/or seal. That leak causes a loss of Reverse and also OD and D along with that many times (happened to my '94 when it was running full line pressure). Also, the Reverse Band had only ONE anchor point on the case (later updated to two anchors on 97+) which would break loose and cause those same symptoms AND FUBAR the transmission case at the same time. Fill out your signature with your vehicle's data, milage, modifications, etc. Makes it a lot easier to help you if we know some of the basic details of your truck. About 150-200,000 miles (~250-330,000 Km) is the max life expectancy of the '94 version 4L80E depending on how it was treated before needing to be rebuilt (provided it did break the case internally if the Reverse Band Anchor broke loose, then the case is unfixable and trash). Seen them go toast with less mileage on them, seen them go longer. All depends on how it was treated.
