Don Baker
Newbie
have a gmt400 c3500/2 wheel drive/4 door/dually//eng in the 7.4l TBI.it has the vortec supercharger on it with stock exhaust Y pipe into 3" pipe to a flowmaster 3" inlet and duel 2 1/2" outlets[converter has been removed]4l80e trans with a gear vendor overdrive behind it to a 4;10 rear end../225/75rx16 tires;;;need to use truck for towing only but my race car trailer is 7500 lbs empty;;
what be my best cam choice and what other mods and things needed to get my truck to tow better?do not want to remove eng and do a full build;;already done the major tune up with upgraded wires/dist/msd coil..this truck can not tow my trailer over the hills I have to tow over;;real big pig//I did noticed that I can not find a 02 sensor anywhere on truck and having not found a wire plug for it except on driver side in harness going down firewall behind brake hydrobooster to rear of truck I did find a single wire but has no plugin on it but could have been burnt off or cut off..not sure it is the 02 sensor wire or not;;best I found out was the 02 sensor goes in left side exhaust manifold;;mine has a hole in it but past owner plugged it;;took plug out to install 02 sensor but hole in manifold is way to large for the 02 sensor;;only thing I can think of is maybe past owner changed out the exhaust manifold for one that had a egr tube that went into that hole;;i'm guessing because with no 02 sensor could be some of my no power to tow issue also...even if it is I still want to do what ever upgrades[mods]to get truck to tow better;;
what be my best cam choice and what other mods and things needed to get my truck to tow better?do not want to remove eng and do a full build;;already done the major tune up with upgraded wires/dist/msd coil..this truck can not tow my trailer over the hills I have to tow over;;real big pig//I did noticed that I can not find a 02 sensor anywhere on truck and having not found a wire plug for it except on driver side in harness going down firewall behind brake hydrobooster to rear of truck I did find a single wire but has no plugin on it but could have been burnt off or cut off..not sure it is the 02 sensor wire or not;;best I found out was the 02 sensor goes in left side exhaust manifold;;mine has a hole in it but past owner plugged it;;took plug out to install 02 sensor but hole in manifold is way to large for the 02 sensor;;only thing I can think of is maybe past owner changed out the exhaust manifold for one that had a egr tube that went into that hole;;i'm guessing because with no 02 sensor could be some of my no power to tow issue also...even if it is I still want to do what ever upgrades[mods]to get truck to tow better;;