The TCI Constant Pressure Valve Body instruction notes that this installation is easier to perform with the transmission out of the car, but that is chiefly to help keep the transmission check balls in place up in the transmission case and changing out the 2-4 Servo. Our installation was completed on a lift for photographic purposes, but this installation can be performed at home in your garage, making sure to first safely support the vehicle to create enough room under the vehicle to work on the automatic transmission. After the attachment bolts are out, the tube is gently pried free. With the pan drained and removed along with the fluid filter, we carefully removed the accumulator valve from the rear of the transmission, along with the fragile accumulator valve tube. A TCI exclusive, the Constant Pressure Valve Body ensures that internal line pressure stays at an acceptable level regardless of the TV cable setting. Personally challenged to set the TV cable adjustment for proper line pressure and shift kick down, Murray and his classic GM muscle were the perfect test bed to try out one of the new TCI Constant Pressure Valve Bodies for 1987-92 GM 700R4 transmissions. Michael Murray is like most street machine enthusiasts, a guy with a cool car that features some upgraded performance goodies, a warmed up 350-cid engine and 700R4 transmission. Without proper clamping pressure, these clutches will slip, creating destructive internal friction and residue that will quickly ruin your transmission.
Having the correct line pressure ensures that the internal transmission clutches clamp together tightly so power is transferred to the rearend. If you've ever installed an automatic transmission, you know that setting the TV cable adjustment to achieve the correct standard internal line pressure and proper shifting is extremely important.
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