![]() Lastly, the EPC boost pressure relief valve system provided helps protect against accidental runaway boost pressure to stop the case and direct drum failure. In addition, the included highly improved wide land design boost valve and bushing resists wear so that pressure regulation functions consistently for the long haul. Dual feeding the 3 rd gear clutch triples the torque capacity of the 3 rd gear clutch which is the Achilles heel of this transmission. Also, the laminated triple separator plate provides dual feed for the 3 rd gear clutch without having to dismantle the transmission. The included valve body, pump and internal components are calibrated to work in concert with an aggressive line pressure curve that will greatly improve the overall durability and shift feel of the transmission. Similarly, the internal vacuum modulator setup provides an aggressive line pressure curve and regulation without the need for a TCM. It’s all about providing the required gears when there are no computer controls. It is designed for the off-road driver only and for vehicles that do not have any TCM controls. This kit delivers short firm shifts for performance as well as greater overall durability. ![]() ![]() This TransGo Reprogramming Kit provides full manual control for upshifting and downshifting 1st through 4th gear, there are no automatic shift functions retained. On the other hand, the runaway boost pressure problem can result in a costly broken case, direct drum and piston failure. With the low boost pressure problem, the resulting complaints are a soft 2-3 shift, direct clutch failure as well as the gear ratio and solenoid performance codes. The boost valve assembly is notorious for wear causing both low pressure as well as runaway boost pressure. Common complaints on this transmission are no upshifts, soft 2-3 shift, burnt direct frictions, broken hard parts as well as gear ratio and solenoid performance codes. This 4L80E-3 Reprogramming Kit fits 1991 to 2013 General Motors vehicles equipped with the 4L80E and 4L85E automatic transmission with gas engines only.
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