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Transmission selection for 6.3L LM7 swap

This is a discussion on Transmission selection for 6.3L LM7 swap within the LSx Retrofit and Swap forums, part of the LSx Technical Help Section category; Hey everyone, New here! I beginning a frame off build of a 1948 chevy and upgrading to an LS setup. ...

  1. #1
    Junior Member
    Join Date
    Dec 2022

    1948 Chevy Coupe

    Transmission selection for 6.3L LM7 swap

    Hey everyone,
    New here! I beginning a frame off build of a 1948 chevy and upgrading to an LS setup. I already purchased the motor and a trans. Motor is a 5.3L Lm7. Unfortunately, I didn't do enough homework and purchased a 1998 4L60E (tag code 8CAD, 613CADY09465781) sounds like from a 1998 van. From my resent searches, it sounds like getting that mount up is a pain and I'm probably better off getting a different trans. I have located a 2wd 4L60E trans that I am told is from a 2007 Silverado (tag code 8CLD, 618CLD445120051). I would like to avoid buying yet another transmission that I'm going to have to worry about flipping. Everything I am seeing so far, it shouldn't be a problem and the only difference is that is has a ISS speed sensor that my ECM will just ignore. So my questions are:

    1. Has anyone done this exact swap or can provide me a sanity check that these will be compatible?
    2. Searching that 8CLD online, everything I am seeing says that is a 4L65E, not a 4L60E. The seller who does alot of demo work insists it is a 4L60E. I'm inclined to believe him, but it does confuse me. Am I missing something?
    3. Is there anything else I am missing that I may run into and want to check out?

    Thanks everyone, any info would be helpful.

  2. #2
    Senior Member bluehawk2000's Avatar
    Join Date
    Aug 2009

    midnight blue
    2000 trans am

    Just a little info on these transmissions, first off I hate them, they're notoriously problematic and do not hold up to a ton of power.

    The two transmissions cannot be differentiated from the outside. The 4L65E shares the same exterior parts but have stronger internals such as 5 pinion planets compared to 4 in the 4L60E. 4L60E uses a 6.5" depth bell with 6 bolts for non gen 3 LS applications and a 7" depth bell with 7 bolts for LS applications. The 4L65E/70E uses a 7" depth bell and 7 bolts.

    They also have different input shafts and torque converters. 4L60E's uses a 298mm input shaft for non LS and a 300mm input shaft for LS applications. 4L65E/4L70E uses a 300mm input shaft and converter designed for LS applications only.

    The TH700R4 was renamed "4L60" (RPO MD8) following the new General Motors naming convention when the electronic version, 4L60E (RPO M30), was phased in as the 4L60 was being phased out. This happened in 1993 for trucks, vans, and SUVs, and 1994 for rear wheel drive passenger cars. In 1996, a bolt-on bell housing was phased in (along with a six-bolt tailhousing) for S-10 Trucks and S-10 Blazers and beginning in 1998 for all other applications. Beginning in 1998 a new 300mm torque converter with improved higher-capacity internals, 300mm style input shaft, and 300mm style pump was also introduced on models coupled to a Gen III Small Block. The 4L60E is rated to handle up to 360 ft⋅lb (490 N⋅m) of torque. It weighs 133 pounds without transmission fluid.[1]

    The 4L60E family of transmissions use 2 shift solenoids, initially called Shift Solenoid A & Shift Solenoid B, later changed to comply with OBD II (On Board Diagnostics revision 2) regulations to 1-2 Shift Solenoid & 2-3 Shift solenoid. By activating and deactivating the solenoids in a predetermined pattern by the PCM, 4 distinct gear ratios can be achieved. The last 4L60Es were only used in the GM Vans in 2013, before being replaced by the 6L80E. The shift solenoid pattern, also sometimes referred to as solenoid firing order, is as follows;

    Shift Solenoid Pattern

    1-2 Solenoid 2-3 Solenoid
    1st Gear On On
    2nd Gear Off On
    3rd Gear Off Off
    4th Gear On Off

    An updated 4L60E, the 4L65E (RPO M32), was phased in the 2001 model year when coupled behind the 6.0 Vortec. Five-pinion front and rear planetaries, along with an additional 3/4 clutch allowing 7 clutches in the input housing and induction hardened input shaft assembly, were improved to withstand up to 380 ft⋅lb (520 N⋅m) of torque.


    Cadillac Escalade
    Cadillac Escalade EXT
    Chevrolet Corvette, 2005 only
    Chevrolet Silverado SS
    GMC Sierra Denali
    GMC Yukon Denali
    Holden Commodore, VZ 6.0 only
    Holden Crewman, 2004 only
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    HSV Clubsport VZ
    Hummer H2
    Pontiac GTO, 2005–2006 (M32, 3.46:1 final drive)

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