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Old 05-30-2004, 04:24 PM
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Question 98 4L60E billet servo

I recently tried the Sonnax 2nd gear corvette and 4th gear billet servo on my GM 98 K1500's stock 4L60E. There are no modication (internal or re-programming) done to the 4L60E except it has the B&M ShiftPlus Electronic Module. It works great with the factory servo and the shift points are at factory setting. After I changed the servo, with stock pin length, at part throttle, it shifts 1 to 2 at 3500 RPM. At full throttle, it shfits 1 to 2 at 5500 RPM. The shift quality is not as firm at the factory servo. Then I grinded the pin tip down ~ 0.060". Shift points did not change (~3500 RPM at part throttle) and it had a hard time to go into 4th. It showed code P0751 (Shift solenoid A performance or stuck off). The above road tests were performed with the B&M ShiftPus at all three settings with same result. Today I removed the new servo and reinstalled the factory servo. Everything is fine again. Shift points back to factory, and shift quality is firmer, no trouble code. I don't believe the servo would change the shift points. Any input or tip would be helpful. Thanks in advance.

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Old 05-30-2004, 04:46 PM
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I have the same setup in my 2k Silverado truck. usually you have to space the servo IN to reduce band clearance, not grind the pin down. there is a spacer from TransGo that I use under the billet OD Sonnax servo. I have over 50k miles on my setup.

With the vette servo the PCM will engage the torque management part of the programing. The shift quality at WOT with the vette servo will drop way off when the computer cuts the engine timing to zero. GM uses this torque management programing to save the tranny from full power during shifts at WOT

I do not have any electronic modifiers on my truck.

you might a get a trouble code for solenoid A since it comes "ON" for the OD shift.

I gotta sign this too?

Dont worry how old you are... it is the mileage on your body that adds up.
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