Cherrybomb

Hi all,
I just picked up a 05 k2500HD 6.0/4l80/4x4 excabsb. On 33’s with 4.10 gears.
It has longtubes 1 3/4”, and a Howards Rattler low lift cam. Gigantic cold air intake also.

The trans is currently out of it. I have a good trans to go in it, but its stock. I feel like I should at least put in a shift improver/valve body kit and “maybe” a stall? I have read the stock converter will stall at 2400, is that enough for this cam?

i bought this truck for my son, who just got out of the Marines, he wants to start a pressure washing business, so it will be dragging around a 6000lb water buffalo/pressure washer. As well as just rompin around I’m sure.

I dont have a ton of money for this, im just trying to do whats best for what the combo already is. Im not looking to change the cam out, or anything else. Just get the trans done and get it on the road. So maybe $175 for the shift kit, can I get a good enough converter for this application for a couple hundred bucks?
Thanks guys!

(cross-posted to another site as well, looking for all opinions please)

FFDP

iTrader: (2)

What are the specs on that camshaft, that what you need to know.

A stock 4L80e won't stall that high, they are usually under 2,000rpm.

Cherrybomb

Summit Racing Part Number:
HRS-198035-09
UPC:
840793133659
Cam Style:
Hydraulic roller, OE roller
Camshaft Use:
Street
Camshaft Manufacturers Description:
Choppy idle, high performance street, stock converter ok, best with 1800+ stall and gears.
Basic Operating RPM Range:
2,200-6,500
Intake Duration at 050 inch Lift:
226
Exhaust Duration at 050 inch Lift:
234
Duration at 050 inch Lift:
226 int./234 exh.
Advertised Intake Duration:
275
Advertised Exhaust Duration:
282
Advertised Duration:
275 int./282 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.525 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.525 in.
Valve Lift with Factory Rocker Arm Ratio:
0.525 int./0.525 exh.
Lobe Separation (degrees):
109
Remanufactured:
No
Computer-Controlled Compatible:
No
Valve Springs Required:
No


In the reading I have found, alot of guys are saying the stock HD converter is different, and stalls at like 2400, some guys are saying theirs is flashing at 2600 even.
I am NOT a 4l80 genius by any means, but a few new projects have these in them, so Im going to learn.
The cam shows it doesnt need a converter, but my experience in the past is even a “cheaper” aftermarket converter in a mild application can make a huge difference. But if I dont need to put one in, that would be great too!

joom

In my opinion that is way too much cam . Any converter you could find for a couple hundred bucks is probably not worth having

silentbravo

iTrader: (1)

You can brake stall them up mid 2000 RPM because the hydroboost is so good. If I'm reading that right 226 Int / 234 Exhaust on the cam, that is fairly large. Not going to be good for low end power or towing unless you're pushing like 4k+ RPM all the time or combine it with some forced induction.

The Trailblazer SS torque converter used to be recommended a lot (it had a bit higher stall than other factory converters, and "was" cheap) but I can't remember if that is only for a 4l60e, then it wouldn't apply to you.

strutaeng

I wouldn't worry about a "shift kit" at all if the transmission is healthy, but yes to matching the stall to whatever if that's what they recommend.

Replace the torque converter lock up O-ring and front pump seal. Probably the rear tail housing seal as well. Those can leak once they have high mileage.

Are you removing the transmission oil pan/replacing the filter?

FFDP

iTrader: (2)

Oof, yeah that camshaft is kinda huge. It's not going to tow as well as smaller camshafts with the way it is now.

That camshaft can make some serious power. If you plan to keep it you need to make damn sure it's got enough fuel injector and that the tune is dialed in. No way stock injectors will be enough for that camshaft.

Cherrybomb

You guys think thats a big cam? I see so many of them in 4.8’s, i thought it was kinda small for a 6.0 liter. Its got some overlap, but only .525 lift, its in the “low lift” caragory.
I mean, i get its larger than what we used to put in smaller cube engines, but by LS standards its pretty small.
Should be good for 2000-6000 rpm, with the headers, 4.10’s it should be a beast midrange.

I dont know what tune is in it, as I havent been able to drive it yet (trans), so i may have to get it re-done.

01WS6/tamu

iTrader: (36)

Put a good transgo kit in it they have a ton of upgrades for the valve body and the separator plate as well as eliminating the PWM TCC control which will make that tranny shift like new and last forever. Just set it up for the HD tow and not any of the drag race bs it will shift like the old 400's of yesteryear firm but not miserable. All that tranny is is an electronic 400 with overdrive.