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71meangreenc10 · 10-21-2021, 01:22 PM

Has anyone looked to see if newer 4L60E's are backwards compatible with just changing out the valve body and case plug? I have a 3LPD with shows to be a 2013/2014 style with a Blue Case Plug. My vehicle is a 2005 5CHD transmission with a Green Case Plug. I would understand PCM problems if the case was machined different and the valve body circuits were different. Looking at the valve bodies, they look to be the same besides the newer added wiring on the 3LPD along with what looks like a ISS in the case.

Thoughts?

Smitty

10-21-2021, 01:22 PM	#1
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,158	4L60E Backwards Compatibility Has anyone looked to see if newer 4L60E's are backwards compatible with just changing out the valve body and case plug? I have a 3LPD with shows to be a 2013/2014 style with a Blue Case Plug. My vehicle is a 2005 5CHD transmission with a Green Case Plug. I would understand PCM problems if the case was machined different and the valve body circuits were different. Looking at the valve bodies, they look to be the same besides the newer added wiring on the 3LPD along with what looks like a ISS in the case. Thoughts? Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time