![]() If the transmission selector sensor fails, it will send the wrong signal to the TCU. In an automatic transmission, the TCU uses this information to determine when to shift gears. The transmission selector sensor is responsible for telling the transmission control unit (TCU) what gear the transmission is in. If the problem persists, have the transmission inspected by a qualified technician to determine if there is internal damage causing either leaks or contamination of your transmission fluid. These are things that you can easily do if you know your way around the location of the dipstick, reservoir, and drain plug of your transmission system. If the fluid is low or dirty, flush and refill the transmission with fresh fluid. Dirty transmission fluid can cause a build-up of debris and sludge on the gears, which will prevent them from engaging correctly. If the transmission fluid is dirty, it may also be preventing the gears from interlocking properly. This can result in the gears not meshing properly, which will prevent the transmission from shifting into reverse. If the fluid level is low, it may not be reaching all the moving parts in the transmission. The most common cause is low or dirty transmission fluid, and this is what you should check first before blaming the problem on the other parts of your auto. There are a few reasons why your 700R4 transmission may not be shifting into reverse. Insufficient or Poor Quality of Transmission Fluid The problems common to the 700R4 transmission that result in its loss of reverse operation are the following: 1. In this article, we will explore the different factors taking away the reverse function of the 700R4 in particular, which can also affect other types of transmissions. It will restrict your movement in tight situations or prevent you from immediately backing out from an object that suddenly blocked your path. Having a no reverse operation will still let you drive your auto but it will limit your mobility. The reverse function of our vehicles is as important as their forward run. Common Problems Causing the 700R4 to Lose Its Reverse Function However, one of the problems commonly encountered by its users after some time is the no reverse issue. So, if you happen to be looking for a replacement or swap to your transmission, this remains a good choice. Although many 700R4 in circulation now have mostly been rebuilt as their stock versions were already way past their usable lives or no longer as effective, they enjoy still quite a following in the market. The 700R4 saw a wide range of applications under the GM group of companies, but among the most popular vehicles to use it were the Chevrolet Corvette, Chevrolet Camaro, Chevrolet Blazer, Chevrolet Impala, and GMC Typhoon. The transmission model was renamed the 4L60 in 1990 and it was referred to as such until its production folded after the 1993 model year. It was introduced in 1981 and was consequently used in Chevrolet and GMC vehicles by 1982. The 700R4, one of the versions of the Turbo-Hydramatic or Turbo Hydra-Matic (THM) trademarked by General Motors (GM), is an automatic transmission designed to work primarily with trucks, sport utility vehicles (SUV), or sports cars.
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