RPO code KNP? Heavy Duty Trans?

327amc · February 25, 2022

Ive an 06 sierra 4x4 4.8L reg cab longbed, automatic. Ive found the code KNP means "COOLING SYSTEM,TRANSMISSION,HEAVY DUTY HVY DUTY TRANS CLG SYS(KNP)"

Im assuming this means 3" deep pan and transmission cooler?

CamGTP · February 25, 2022

Yeah. The transmission isn't any stronger, just has the cooling package.

Z45 · February 25, 2022

No different pan.

My 2021 Denali has same option code and its called on the build sheet KNP - Transmission Oil Cooler

PS - KNP is a common rpo code used.

Edited February 25, 2022 by elcamino

dna9656 · February 25, 2022

I think because it has a heavy duty cooler it's (in a way) stronger as heat is what gets trannys along with old fluid and a lack of filter changes. I upgraded my 4L60 E to a 4L70E (that's what's in (I'm told) the Escalade and SS car models. More clutches. No outside appearance changes...

Edited March 2, 2022 by dna9656

swathdiver · February 26, 2022

On 2/25/2022 at 12:32 AM, 327amc said:

Ive an 06 sierra 4x4 4.8L reg cab longbed, automatic. Ive found the code KNP means "COOLING SYSTEM,TRANSMISSION,HEAVY DUTY HVY DUTY TRANS CLG SYS(KNP)"

Im assuming this means 3" deep pan and transmission cooler?

KNP is for the external transmission oil cooler on your generation truck.

dna9656 · February 27, 2022

I think the 3" pan is standard, my 4L60E has one. I wasn't sure so I ordered one that came with a drain plug, it was the same depth as the OEM. I like drain plugs on tranny pans, it makes life so much easier and less messy. Also since your supposed to drain fluids as close to operating temperature as possible a drain plug sure helps avoid burns.

Oh btw when I last changed the filter (along with the pan) I installed an after market tranny oil cooler. I installed it where the OEM one goes but It's twice the size of the OEM cooler but the OEM cooler would be a whole lot easier to install.

Edited February 27, 2022 by dna9656

327amc · February 27, 2022

30 minutes ago, dna9656 said:

I think the 3" pan is standard, my 4L60E has one. I wasn't sure so I ordered one that came with a drain plug, it was the same depth as the OEM. I like drain plugs on tranny pans, it makes life so much easier and less messy. Also since your supposed to drain fluids as close to operating temperature as possible a drain plug sure helps avoid burns.

Oh btw when I last changed the filter (along with the pan) I installed an after market tranny oil cooler. I installed it where the OEM one goes but It's twice the size of the OEM cooler but the OEM cooler would be a whole lot easier to install.

Ya thats why i asked, cause my pan looks like the 3" also.