Installing the Go Shift Transmission Controller from FiTech for GM 4L60E, 4L65E, 4L80E, and 4L85E

Modern GM transmissions can be more than a little tricky with all the wiring and tuning involved, but nobody said it needed to be that way. If only there were a little computer you could slap on your firewall that could connect your electronic fuel injection with your fancy new 4L60E, 4L65E, 4L80E, or 4L85E transmission. Better yet, it could give you full control over things like shift points, shift firmness, and torque converter lockup. Maybe you could even get a handy-dandy little touch-screen device that would allow you to control all those functions and monitor the transmission in real time! Man, wouldn’t that be nice.

We’re guessing that by now you’ve read straight through our childish sarcasm and figured out this dreamy idea is in fact a reality called Go Shift, brought to you by the EFI geeks over at FiTech.

When looking for a car to try this new tech out on, we didn’t have to look any further than our long-lasting 1971 Chevrolet Suburban, which is a bona-fide driver that sees plenty of road miles each year. With its FiTech fuel-injected small-block and 4L60E transmission, it was the perfect candidate.

We couldn’t wait to get the Go Shift controller all plugged in and ready to go on the Suburban so we could turn the dial all the way down into granny mode for nice, smooth shifts. It would be nice to have easy control of the converter lockup, too, in case it ever needs to tow in its future. As it turns out, FiTech built in a few other fancy features that we won’t be using—but you might want—including a speedometer output for digital gauges and compatibility with paddle shifters.

Before getting started on the install there was only one thing left to do: rip out all the old wiring and designate a corner of the Suburban’s firewall to mount the new Go Shift ECU. Follow along as we show you how to get your electronically controlled GM overdrive transmission under control.

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