![]() ![]() The down side is its size, at 225 pounds with converter and 31-inch overall length. ![]() The 4L80E uses the larger 32-spline output shaft and offers the highest torque capacity (over 700 ft-lbs in the aftermarket JET model). Its overall length is the same as the 700-R4/4L60. The 4L60E is an electronically controlled version of the 4L60 that retains the 27-spline output shaft and has a 30-percent overdrive. The final two automatic transmissions are the 4L60E and the 4L80E. To switch a Powerglide to a 700-R4, use the Glides 27-spline output shaft, shorten the driveshaft 2.75 inches, and slide the crossmember back 1-¼ inches. Corvette versions have no provisions for a crossmember mount because of their driveline torque tube design, but can be exchanged for a different extension housing that has a mount provision. This trans is a four-speed O/D unit with a 27-spline output shaft. It changed its name in the early ∩0s to 4L60, but the internals remained the same. The 700-R4 is the larger cousin of the 200-4R. The good news is that the driveshaft will not have to be shortened. To swap with the Glide, the crossmember must be moved back 6 inches. The 200-4R measures 27.75 inches, with a 26.81-inch mount position. These transmissions are durable enough to withstand the punishment of the legendary turbo Buick Grand National from the factory. The 200-4R overdrive trans has a 27-spline TH-350-style output shaft and is commonly found in ∨1-∩0 Chevy Monte Carlos, Malibus, El Caminos and Impalas. If a four-speed overdrive automatic is more to your liking, there are four available: the 200-4R, 700-R4/4L60, the 4L60E, and the 4L80E. ![]() Since the TH-400 is a little more than ½-inch longer than the Powerglide, you will have to shorten the driveshaft. ![]() To install a TH-400, use a TH-400 32-spline slip-yolk and move the crossmember back 6 inches. The TH-350 is a direct swap for the Powerglide both share transmission mounting positions, overall length, and spline count. The TH-400 uses a larger 32-spline output shaft. The TH-350 has a 27-spline output shaft and is half an inch shorter overall than the TH-400. The TH-350 was released in 1969 as a smaller economical version of the TH-400, which was introduced in 1965. It has two versions: the early cast iron, which is universally ignored, and the later aluminum case. The Powerglide is a 27.75-inch-long two-speed transmission with a 27-spline output shaft. There are three non-overdrive transmissions. Using the Powerglide as a baseline, CHP will explore how many of these transmissions can be simply bolted in using the same transmission crossmember mount and driveshaft length. Models range from the classic lightweight two-speed Powerglide to the 225-pound monster 4L80E. If automatics are your passion, there are several that will bolt into a Chevelle with little effort. Follow along as CHP bench-swaps a myriad of different transmissions. With the proliferation of overdrive transmissions, a steep First gear, and stump-pulling torque, multiplication can be combined with mellow tones and gas mileage on the interstate. Wide floor pans and ample transmission tunnels makes installing any gearbox possible. The beauty of ∦4-∧2 Chevelles is in their versatility. ![]()
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