zervanj1

looking at getting rid of the 07 rclb and need an ext. what would be faster and better towing, used 08 6 liter 4 speed or new 11 5.3 6speed

iamkeniff

iTrader: (16)

5.3/6spd imo
the 6.0/4spd will be good too BUT lack gas mileage if it not loaded. i say get a 2500 6.6 diesel

CDN SS

iTrader: (1)

How much weight /trailer size you gonna tow?

zervanj1

somewhere around 4000lbs mostly...

CDN SS

iTrader: (1)

No problem withthe 5.3 & 3.42 gear ........ I tow 7000lb with 5.3 3.90 and 4 spd ....tows OK except in headwind needs 4.10 so I can stau in OD ......you should be fine ....with 5.3 6sp if mileage not a concern then yes the 6.0 will be better but as DD the mileage is not great on those motors

Coban

iTrader: (14)

5.3/6-speed. You won't regret having an up-to-date transmission.

GMCtrk

iTrader: (27)

I can't comment on the 6 speed directly, but a 6 liter with the 4l60e and 3.42 gears will get exceptional highway gas mileage, well over 20 mpg. It should also tow much better than the 5.3.

pewterliftedz

iTrader: (4)

5.3/ 6 speed combo and slap in some 3.90s or 4.10. will tow like a beast IMO

Bowtie03

iTrader: (4)

Just get the 5.3/6l80 and drive it a while then swap in a 6.0 lol

GMCtrk

iTrader: (27)

I do agree, getting the newer vehicle is a no brainer.