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#4l60e shift kit tuning manual#
#4l60e shift kit tuning upgrade#
#4l60e shift kit tuning code#

Input sprag (for extended high speed/load use in 4th)īy the way, when General Motors upgraded the 4L60E from a torque rating of 360 ftÂ.

#4l60e shift kit tuning upgrade#

These need an upgrade when putting more than ~300 horsepower through a 4L60E: If you are rebuilding a 4L60E transmission, get a good manual, either a factory service manual, or the ATSG 4L60E guide.īelow is a list of the weak points in a 4L60E transmission.

Setting the Cold Start and Warm-Up Enrichments.

Manifold Absolute Pressure (MAP) Sensor.

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4L60E Modifications Click on our menu buttons immediately below to find MegaSquirt® information quickly:

(2) Pressure regulator valve springs and spacer.

USA-made hardened TCC regulator and isolator valve, spring and installation bolt.

USA-made hardened steel 1-2 shift valve and spacer.

(2) 1-2 accumulator springs, spring seat and three spacers.

Second servo piston spring, two shims and two O-rings.

Burnt forward and low/reverse clutch plates.

Double bump or slide bump on the 1-2 shift.

This kit also includes # 7-CS 3-4 clutch piston return spring kit for the input drum which reduces centrifugal 3-4 clutch apply and failure in 1 st gear at 5500 RPM or higher, transmission removal required. 2007 and later models equipped with the input speed sensor require transmission removal. This kit can be installed while the transmission is in the vehicle on 1993-2006 models only without the input speed sensor.

#4l60e shift kit tuning manual#

Lastly, on 1993 to 2008, the gear command feature will allow for full gear lever controlled downshifts 3 rd through 1 st gear as well as holding manual 1 st or 2 nd gear to any speed or RPM. Furthermore, the included drop-in USA-made TCC isolator and regulator valve features longer lands which restores the hydraulic integrity of the circuit by utilizing previously unused and therefore unworn areas of their bore. These changes work in concert with an aggressive line pressure curve to greatly improve the overall durability and shift feel of the transmission. It includes components as well as modifications that recalibrates the entire accumulation system, clutch and band feed orifices. This TransGo Reprogramming Kit includes valve body, servo, pump and accumulator components and modifications designed to deliver increased durability while providing firm shifts as well as a more efficient TCC apply.

The 3-4 clutch plate failure as well as the 2-3 flare up complaints are caused by an inconsistent pressure boost and poor overall calibration of the shift accumulation system.

#4l60e shift kit tuning code#

The TCC slip code leads to the harsh 1-2 upshift as the ECM recognized the TCC slip and commands high line pressure to avoid further TCC slippage and damage.

The torque converter clutch regulator valve bore is very prone to wear causing the TCC slip complaints and related code. Common complaints on this transmission are TCC slip or shudder, code P1870 or P0894, harsh 1-2 shift, double bump shifts, 2-3 flare up, burnt 3-4 clutch plates as well as inconsistent pressure boost problems. This 4L60E-HD2 Reprogramming Kit fits 1993 to 2015 General Motors vehicles equipped with the 4L60E, 4L65E and 4L70E automatic transmission.