![]() This design change came from GM to service foreign areas (Jaguar/Holden) with only a bellhousing change instead of the full case needing to be cast.ġ996-1997 full size trucks still got the 1-piece cases.ġ998 started all 4L60E's with the 2-piece case. The bolts used to retain the bellhousing are Torx-plus 50-IP design. Internal electrical is different from that of 1993/19 and up.ġ996 started the 2-piece case or bolt on bellhousing and came in the S and T bodies. It also was changed to a PWM (pulse width modulated) TCC apply. It has the long manual shaft for the externally mounted neutral safety switch. I hope this clears some of it up.ġ995 was a year all on its own. Many people are confused over the changes made to the 4L60E from 1995-2001. They are a one-piece case and had a short manual shaft. The 1st digit being the year, the 2nd digit being the body code, the 3rd being the internal gear-train.īasically the 19 are the same. It also contained the Julian date for time of day and the shift it was built on. Both contain the code for the what the transmission was made for. For the 2-piece case it is on a flat surface of the case just behind the rear of the pan. For the 1-piece case it is on the right rear corner of the case on the flat surface just above the pan rail. For a fail-safe way to identify them, there is also a stamped code or etched code on the case. The sticker was placed on the bellhousing or the case, depending on the design. To identify all 4L60E’s GM put a code on a white sticker. All 4L60E case connectors are a 20 Pin connector that used 13-17 pins, more on that later. Part of the confusion is in the change from the 1-piece case design and the transition to the 2-piece case. All 4L60E's had a 4-pinion planetary gear train. It came out in 1993 and ran until 2012(limited with Colorado's/Canyon/Hummer). ![]() The 4L60E has a 20-pin case connector on the passenger side behind the 2-4 servo as well.Īll 4L60E’s were given the M30 designation for the RPO code. All 700R4's had a 1-piece case like the 4L60E in 93-95 S&T trucks, 93-97 C&K trucks & 93-97 cars. The 700R4 had a 4-pin electrical connector on the driver’s side of the transmission and a cable that attaches to the passenger side behind the 2-4 servo assembly. To identify the main differences between them: I started from 1982-1992 and some 1993 model cars. The 700R4 is the predecessor to the 4L60E, it is just a hydraulic version and is still valued for hot rod swaps and uses the same gear ratios. Personally it is not fair to the 4L60E series transmission without touching on the 700R4. The maximum torque capacity for each includes:ĤL80-E – 440 lb.-ft. The external dimensions and mounting provisions are identical for each. Each planetary gearset in the 4L80 has four pinion gears, while the 4L85 has five pinion gears. The production-based Hydra-Matic 4L80 and SuperMatic 4L85 transmissions are differentiated by gearset design. Maximum torque capacity for each includes:ĤL60-E – 380 lb.-frt. The external dimensions and mounting provisions are identical for each transmission in the 4L60 family. There are five pinion gears in the 4L65 and 4L70, but the 4L70 has a higher torque rating. Each planetary gearset in the 4L60 has four pinion gears. ![]() The Hydra-Matic 4L60/4L65/4L70/4L75 family of transmissions is differentiated primarily by gearset design. Here is a copy and paste quote directly from the 2019 GM Performance catalog that includes the newest 4L75E transmission. ![]() ![]() Let us start this with something from the manufacturer itself. Please keep in mind that all model years were a transition from one to another and model years usually start in September of the previous year. " This information from is from GM, ATRA (Automatic Transmission Rebuilders Association) and ATSG (Automatic Transmission Service Group) and having been building them since the beginning of the 700R4 in 1982.įorgive me if some of my year data is incorrect, I am shooting from memory. also the 7 bolt bellhousing is not a guaranteed indicator of a 4L65.Ĭopied from elsewhere in a doc I had saved a couple of years ago. ![]()
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