Hey all,

I have been reading and ready and searching and reading some more, but I just can't decide on a cam for my truck.

I have a 2004 GMC Yukon XL 2500 with a 6.0L and 4l80e tranny. She is mostly stock except for a CAI and a BB tune. That said, according to specs, it weighs around 8800lbs (I don't have access to a scale to verify).

A lot of the suggestions lean towards a TR220 or TR224 cam, but i am wondering if I should go larger due to the weight? This cam has gotten my interest - "TR TRuTorq" Level 4 - 227/234 .616/.614 115 LSA

Once in a blue moon I will tow 5000lbs or so, but it is usually a mix of city and highway driving.
I would like this thing to stay a daily driver, and not kill my mileage too much, I'm probably only getting about 2mpg as it is!

I'm also looking at a Yanke 2600 torque converter.

Please help!

 

^^^ 227/234 .616/.614 115 LSA...
for a cam that size you will need a much larger converter to get the most outta the cam more around 3200-3600 stall

 

So I would be looking at something like:
YANK PRO TRUCK 3200 4L80E LS1 or
YANK PRO TRUCK 3600 4L80E LS1
I can't tell if I would keep my towing abilities with these?

Will either of these affect my ability to cruise on the highway at about 2300rpm? Sorry, i know that's a really dumb question, I am just having trouble wrapping my head around how the converters act at a cruising speed less than their stall.

will that trutorque cam be too much for a daily driver?

 

we are both in the same boat, i have an 80e also. if you still want to tow i would say a stall no bigger than 3200 is what you want and IMO do think that cam is too big for a DD. i woudnt go bigger than a tsp228 or a custom grind 224/226...

im seeking the same your looking for, i dont want to cam my truck and loose its truck capabilities

 

first off if u have a heavier vehicle, you don't want togo bigger in cam... the bigger the cam, the higher the powerband. U need low end torque to get your bus moving.

second, a converter has nothing todo with cruising speed. at .you will see the exact same RPM as you do now.

I would go with a 220 and get with circle D for a converter.
with one phone call to chris he will explain to you which converter you need for your needs, he will custom build one just for you

back in the day zippy did a 224 cam with 862 heads on his wifes LQ4 tahoe. If your willing to change heads to bring up compression, you can go up in cam size..

 

Yup, it definitely needs to keep its truckability!

I was kind of thinking the trutorque might be a bit too much for a DD...

If I stay with this cam
"TR 224-112" - 224/224 .563/.563 112 LSA
I would probably be fine with the 2600 stall, right? According to the dyno on thunder racings's website, it looks pretty good in that range. Or am I reading it wrong?
Last question for the moment, will the stock converter hold up to this cam? I'm okay with operating a bit under the cams power band, but I don't want to break anything...

Thanks a lot for the help!

 

Just an FYI - I've been chatting with a guy at Whipple (I wanted to build something that a Whipple charger could fit nicely onto without parts being wasted later).

Anyways, he told me that in 60-90 days they will be releasing a Whipple charger kit for 99-06 4.8L-6.0L engines, and he mentioned another 50-60% more HP and torque all across the rpm band. It will be very similar to the 2007-11 kit. I know where my $$ are going now...

Would a yank 2600 converter still be a good choice with the whipple? I really am hoping to not have to go larger as when i am using it for a DD, I don't want to have to get it to 3000+ rpm to move around in stop and go traffic...

 

You can get a Magnacharger for that application now. Is there some reason that a Whipple is preferable?

 

8800 lbs? hahaha LOL. Thanks for the laugh.

Anyways, that cam you suggested will kill your low end. Something in the 210s/220s is much more suitable.

You should be looking into upgrading your exhaust before the cam. You'll gain a solid 25 rwhp with no loss of low end or driveability.

 

The post above is correct.


You will regret going with a 224/224 and 3200 stalled converter if you are serious about towing. Something like the "old man" cam would work great IMO. Search for it.