trainwreck91

How can I tell which transmission I have on an 07

in2pro

I am believe all 5.3L have the 4L60E if you have a half ton vehicle...
The 3/4 ton have the 4L80E....
I don't think the RPO codes will say what transmission is in the vehicle or at least mine does not...
The transmission should have markings on the side but I have no idea if you can see them easily....

in2pro

I stand corrected :P

the M30 RPO code is the 4L60E
MT1 is the 4L80E....


4L60E -- 4 Speed (M30)
6L80E -- 6 Speed (MYC)
4L80E - 4 Speed (MT1)


LY2 -- 4.8L V8 Non-Active Fuel Management, Iron Block, 2WD
4L60E -- 4 Speed (M30)

LMG -- 5.3L V8
Active Fuel Management, Iron Block, E85 2WD & 4WD
4L60E -- 4 Speed (M30)

LY5 -- 5.3L V8
Active Fuel Management, Iron Block, 2WD & 4WD
4L60E -- 4 Speed (M30)

L92 -- 6.2L V8
Non-Active Fuel Management, Aluminum Block, AWD
6L80E -- 6 Speed (MYC)

LC9 - 5.3L V8
Active Fuel Management, Aluminum Block, E85 4WD Long Wheel Base
4L60E - 4 Speed (M30)

LY6 - 6.0L V8
Non-Active Fuel Management, Iron Block, 2500 Series
4L80E - 4 Speed (MT1)

intheburbs

Wouldn't the 07 2500s have MYD, the 6L-90? That's what my 08 has.

in2pro

Here are 2 other listing I found but they don't link to a particular engine...

MYC
Transmission - Automatic 6 Speed, HMD, 6L80

MYD
Transmission - Automatic 6 Speed, HMD, 6L90

trainwreck91

Thanks. I guess it's the 4l60e. Lc9