Editing General Motors transmissions (section)
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==Four speed automatic== ===2004R=== The 2004R transmission is the same length as a 6 inch tail housing T-350 transmission. The 2004R requires a TV cable hook up at the EFI or carb with the correct geometry for correct operation. [[File:1984_THM200R4_Pic_1B.jpg|none|frame|2004R removed from a 1984 Delta 88 (GM B body).]] Many 2004R uses a dual pattern bell housing and a 4-way connector. If you are not using the ECM/TCM unit, then there are aftermarket kits sold that will operate the locking converter. Unlike the T-200 which could be a locking or non-locking torque converter, all 2004R transmissions used a locking converter. In custom/non original applications, an [https://www.summitracing.com/parts/aww-500412/overview/ inexpensive lock up kit] will simplify installation, the instructions in the kit are reported as being vague, so further research may be needed. ===700R4 (4L60)=== ===4L60E=== 4L60E is an electronic shifted and pressure controlled version of the 700R4/4L60 transmission. Introduced 1993 with the GM truck lineup (GMT400 trucks, G-series vans, M/L van (Astro/Safari), and GMT325 (S-series including the 1993 Typhoon). *Early 4L60E resembles the non-electronic 4L60/700R4 but does not have a governor assembly; RH side of transmission case has a green plug which is the main electrical connector. *1995-'97 production 4L60E has a PWM solenoid added to the valvebody - produced until 1997. **Some 1996-'97 GMT400s will have the early 4L60E with some overlap since the second design was initially used with the Vortec 4.3L which had a redesigned oil pan that bolts to the transmission bellhousing. Second design 4L60E introduced in 1996. First use was with 1996+ Vortec 4.3L used with the GM truck/van line. Produced until the 2005 model year when the S-series was phased out. *Has a removable bellhousing. *Tailhousing has six bolts. Third design 4L60E introduced in 1997. Replaced the second design where this variant is known as the LSx 4L60E (includes the 4L65 and 4L70).*First used with the fifth generation (C5) Corvette behind the LS1. *Has a 7 bolt bellhousing and longer input shaft. *When used with the 4.3L the crankshaft pilot was deepened to 1.410" - this also included a redesigned flexplate. ===4L80E=== 4L80E is a full electronic controlled and shifted transmission with similar design and strength to the T-400 trans. Early 4L80E and TH400 shared some parts that could be swapped. In 1996 the 4L80E has some design changes in lubrication circuits. You must be very careful when replacing gear train parts in late design 4L80E. ===6L80E, 6L90E=== General Motors 6 speed automatic. While some parts swap between the 6L80 and 6L90, there are differences to watch out for, such as a longer case length for the 6L90 as well as larger output and spline count. Verses the 32 splines of the 6L80. [[File:6L90 trans.jpg|thumb|left|330px|6L90 transmission.]] <br style="clear:both"/>
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