The 4L60E is generally going to be a little bit longer than other models like the TH350, so you’ll need to shorten the old shaft or just build a new one (or have someone build it for you). Once you bolt in the transmission and new starter motor, you should now permanently mount the trans and get your measurements for your new driveshaft. If you need to use a replacement starter to accommodate the smaller space, that’s no problem. ![]() To get to the converter bolts for the 4L60E you’ll need to access through the starter motor hole, so remove the starter and torque the converter bolts to the TCI flex plate. The 4L60E is going to need a little room. Make sure you have clearance for the servo cover and the right-angle AN cooler fits. Next, you’ll remove the old trans (let’s say you’re working with a TH350) and bolt 4L60E into place for the moment. In this situation, you might use a lockup torque converter with a new flexplate to facilitate an externally balanced 383 small-block setup. The bell housing bolt pattern will likely be the same for the A-body (the 4L60E trans is a 90’s design and generally pays homage to older auto bodies). Once you have these considerations in place, you’re ready to install the trans. You’ll also need a few mechanical considerations such as a somewhat shortened driveshaft and a few floorplan modifications, most likely. The 4L60E is an electronically-controlled overdrive, meaning in a swap it’s going to need electronic “gatekeepers” such as a standalone controller, throttle position sensor input, and the ability to convert the electronic signal to a usable speed display. But it will be worth it! If you need a transmission to start with, here’s a good cheap rebuilt 4L60E for sale. For this situation, you’re probably going to need to budget somewhere between $3,800 and $4,500 for the swap. Let’s say you’re wanting to do a 4L60E swap on an A-body vehicle (one of the more common swaps).
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