First, let me qualify this post: This fix is for most BOSE amp boards in C4 Corvettes. If your amp board doesn\’t look similar to the one shown below, yer outta luck. From my experience (and that of others) I give this fix a 70% success rating. I CAN\’T POSSIBLY GUARANTEE THIS WILL FIX ALL […]

C4 4+3 Overdrive Bypass This mod will bypass the ECM and allow \”on-demand\” overdrive operation (in any gear, at any speed, whether warm or cold). Disclaimer: I accept no responsibility for any malfunctions or damage resulting from this modification. Proceed at your own risk! This modification assumes your Overdrive is operating correctly, and all wires […]

1) Open the door & remove the old spring remains, if any. 2) Clean & lubricate both door rollers so they turn freely. 3) Clean & lubricate the spring holes & slots(both upper & lower) with silicone grease. 4) Open the door approximately � of full open(this is IMPORTANT) and while working from the bottom […]