![]() Some of the changes to the engineering design significantly influenced how the current 700-R4 transmission has evolved. Until 1993, the 700-R4 was revised many times. Many trucks and rear wheel drive automobiles such as the Corvette, Camaro, Jimmy, Suburban, 1/2 ton pickups, S15 and S10 trucks benefitted from a better transmission. The 700-R4 was used in automobiles between the periods of 1982 – 1993. Some of these changes are discussed in more detail in the next section. Overrun Clutch Hub – A raised area was added to tangs on hub Input Sun Gear – The sun gear shoulder was reduced, reduced overall heightĥ. Roller clutch assembly – The assembly was changed to Sprag freewheel with 26 elementsĤ. ![]() Outer Race – The lube hole positions were changed along with the inside diameterģ. Inner Race – A pressed on flange was addedĢ. The change affected several aspects of the transmission:ġ. The longitudinal 700-R4 became an upgrade for many of the older, rear-wheel drive cars. A new model of forward clutch was being manufactured by May 1982, which replaced the roller clutch found on all THM 700r4 transmissions. A TV cable was used as a throttle position sensor for gear shifting. The model featured a lock-up torque convertor (view on Amazon) that allowed a connection which was direct and non-slip. The replacement 700r4 was a 4-speed automatic transmission was a bit longer in design, fully equipped with the overhead gear. The TH350 transmission was less durable and lacked an overdrive gear. The birth of the 700-R4 changed the market for automatic transmissions. The first gear ratio of 3.06 was lower than normal, and provided off road torque and offline acceleration: 700R4 Transmission Ratios The 30% overdrive is the source of popular fuel economy. The 700-R4 lower first gear ratio is a source of superior performance for low speed. The 700-R4 is compatible with V8 and AMC 16 engines: 700R4 Transmission SpecsĤ speed, overdrive automatic transmissionġ982 – 2012 GMC, Buick, Chevrolet applications The transmission weighs about 155 lbs with around 16 bolts and offered a standard V8 90° metric bolt pattern with 4.3 V6. The 700-R4 was made manufactured with cast aluminum and measures about 23.4 inches long. One last distinction, the electronic version of the 700-R4 will not have a worm drive. As mentioned, the three wheel drive model has shorter output shafts and adapter assemblies. Another primary distinction between the 700-R4 and the 4L60 is the rear output with four bolts. To identify the 700-R4, you should also look for the 16 bolts around the transfer case. ![]() The 4 wheel drive output shaft on the 700-R4 stuck out for about 3 inches, which is about 2 inches longer than the shaft in the TH350. The two wheel drive models will have a tail housing and the output shaft is longer. Externally, all it needs is a 12-volt source and an engine-vacuum reference.Important: If you want to save $100s in servicing, diagnosis, and repair costs, improve your car's performance significantly and increase its value by 1.2x with little effort, download our Beginners Auto Maintenence & Repair Manual now. TCI's rendition (PN 376600) universally works on all 700-R4/4L60 (non-E) transmissions by rewiring the solenoid inside the trans. Today, it's easiest to just buy an aftermarket TCC wiring kit, especially as they're now widely available from a bunch of sources. There are various home-brewed ways to accomplish this, but due to detailed differences through the years, such schemes may not be applicable to every model. On stock installations, the wires went to the computer to control TCC lock/unlock, but on a retrofitted 700-R4, lockup can be achieved by wiring up analog pressure and/or vacuum switches. Although not a fatal durability error, this prevents the 700-R4 from achieving its ultimate efficiency and fuel-economy potential. Running "no electrical to it at all" (as you say was the case in your previous swap) means-you guessed it-the TCC never locks up. The 700-R4's four- or five-prong electrical connector is primarily responsible for TCC (torque converter clutch) lockup. ![]()
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