So I have just finished my first round of mods which includes:

20" Ultra Mako wheels on 33" Toyo MT's
Imco exhaust dumped
Airaid MIT Intake
CCM level kit
Wheatley Custom Tune
Paint white to match front/rear bumper covers, GMC logo, handles full mirrors
Line X Xtra
Painted Rear Inside Fenders
De-badge and de-molding
PIAA Headlight Bulbs
Cleared Headlights
Chrome Turn Signal Bulbs
White Shorty Antenna
Tint
Pioneer 720PRS 6.5 components
Dayton HO 10" sub
Subthump enclosure
JL 500/1 & 300/4 amps

Now what should be my next mod? Im thinking either 4.11 gears and a TrueTrac or Pacesetter LT headers.

Which mod would give me the most bang for my buck?

 

I say gears and true trac..

what gears do you have now?

 

i didn't know you could get a truetrac for the 900 series trucks. my last search didnt find anything on eaton's website, summit, etc.

can anyone find these for our trucks?

 

Did they change the rearend in them or something?

Last I seen they still had an 8.5" rearend

 

If you have 33" tires, I would definitely do gears first, honestly I'd look into 4.30s. Headers will make it louder, but the hp gains won't be noticed without the gear adjustment.

 

it's still the same rear end.

 

That's what I thought

 

Go fast engine mods are useless without gear behind it. ESPECIALLY if you're running 3.42's or something on 33 inch tires.

 

is the 14 bolt only an 8.5" or do I have a different rear?

 

8.5" is a 10 bolt rear. I believe the 14bolt to be 9.5" ring gear.