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With all of the complexities and variations between the 4L60 and 4L60E Transmissions... Having the "Two Reference Bibles" for immediate research whenever Mixing and Matching between the Truck and Car Line Series of these Transmissions will save you a TON of Headaches.
Knowing what the Specific Transmission and sub-assembly Measurements are will prevent any attempts at installing anything that simply WILL NOT FIT. These two ATSG GM 4L60E Service Manuals are available for around $25.00 a piece on Amazon and tell the complete story:
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These other issues are the important considerations:
(1) Unless you have posted incomplete information... the
4L60 Transmission is NOT the same as the
4L60E as the former is used for example, in the 1993 Chevrolet Camaro Z28 and has NO Electronic Controls built inside and out. The 4L60E has a Park Neutral Switch on the Driver's Side Shift Linkage Armature and an external 20 Pin Ovate Connector on the upper Passenger Side of the case.
(2) The 2002-2006 Chevrolet Trailblazers and Envoys use the
GM Bell Housing Part # 24220855 for the 4L60E 4L65E Transmissions mounted to the GM Atlas 4.2L Engines as part of its Split Case Design. The Outer Bolt pattern is fitted for (11) 15mm Fasteners and the interior Bolt Pattern is designed for (8) Torx Plus Fasteners under extreme TIGHT conditions holding in the Transmission Fluid Pump and Imput Shaft supporting the Torque Converter..
(3) Disassembly of the Split Case design on the 4L60E to remove the (8) Interior Torx Plus Fasteners WILL require the use of a TORX PLUS #50 BIT with a 3/8" Square Drive as shown in the linked images and place for purchase. If you attempt the removal of those Fasteners with a regular Torx Drive Bit... it will walk off the center of those Bolts and ruin them.
Amazon.com: ABN Torx Plus 50 TP50 Torx Socket, 3/8in Square Drive – for Automatic Transmission Front Bell Housing Bolts: Automotive
www.amazon.com
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Other similar offers can be seen at this Link:
Amazon.com: 4l60e torx plus bit
www.amazon.com
(4) Unless the (4) Alpha Numeric Code Numbers marked on the White Label Glued to the Top of BOTH Transmissions are Identical Matches... Use the Original Torque Converter from the Original 4L60E Transmission and NOT the one from the Tahoe.