Kreativestreet
TYF Newbie
Here’s my always gotta do to whatever new nnbs /gmt900
That I just bought .keep in mind that some of the things here may not be “legal” in your state so adjust accordingly
First and WAY first is a DOD delete /afm delete / GET RID OF THE busted afm/dod lifters.
People all say tune it out and while it does put a band aid on the issue the way that’s always made all the sense is get rid of it completely. Yes it isn’t cheap if done correctly “ls7 lifters ,resurface heads,new oil pump,timing set,cam plate,deleted cam”btr makes one “arp head bolts ,oil pan relief valve delete and valley plate/tower block off and tune .YET I can say from plenty of experience doing this can easily get any 5.3//6.2 to 250k miles or more with normal service .
Next is get either long tube headers and higher flow cats or shorty headers .can’t tell you how many cracked manifolds,broken studs come across my shop and it’s not for performance it’s to just avoid the future issue .
New intake manifold gaskets super cheap to get,easy to do and something people always overlook that can cause random misfire and poor performance and kills your mpg
Upstream and downstream oxygen sensors
NOBODY ever changes them and they should be replaced every 35-40k miles.i can’t stress how much these can help
If you have a 6l80 6 speed auto
TRANSMISSION COOLER is a must even if you don’t tow
A Tru kool 40k is cheap,works wonders and will pay for itself instantly keeping most transmissions below 150 deg temp regardless of use .if your feeling spendy,a new converter as well since 6l80s have had a know torque converter issue and are a cause a majority of transmission failures
Last but not least
Front wheel bearings and brakes
It’s not uncommon to need wheel bearings after only one year of normal use
And since your in there redo your pads and rotors or consider a upgrade “2020 calipers and rotors are a cheap way to go”
Of course fluids ,hoses belts etc as needed or if your budget allows should be changed,topped off and addressed but that goes for any vehicle
Hope this helps,gmt900s are nearly indestructible if attention is paid to small things and these common issue points addressed
That I just bought .keep in mind that some of the things here may not be “legal” in your state so adjust accordingly
First and WAY first is a DOD delete /afm delete / GET RID OF THE busted afm/dod lifters.
People all say tune it out and while it does put a band aid on the issue the way that’s always made all the sense is get rid of it completely. Yes it isn’t cheap if done correctly “ls7 lifters ,resurface heads,new oil pump,timing set,cam plate,deleted cam”btr makes one “arp head bolts ,oil pan relief valve delete and valley plate/tower block off and tune .YET I can say from plenty of experience doing this can easily get any 5.3//6.2 to 250k miles or more with normal service .
Next is get either long tube headers and higher flow cats or shorty headers .can’t tell you how many cracked manifolds,broken studs come across my shop and it’s not for performance it’s to just avoid the future issue .
New intake manifold gaskets super cheap to get,easy to do and something people always overlook that can cause random misfire and poor performance and kills your mpg
Upstream and downstream oxygen sensors
NOBODY ever changes them and they should be replaced every 35-40k miles.i can’t stress how much these can help
If you have a 6l80 6 speed auto
TRANSMISSION COOLER is a must even if you don’t tow
A Tru kool 40k is cheap,works wonders and will pay for itself instantly keeping most transmissions below 150 deg temp regardless of use .if your feeling spendy,a new converter as well since 6l80s have had a know torque converter issue and are a cause a majority of transmission failures
Last but not least
Front wheel bearings and brakes
It’s not uncommon to need wheel bearings after only one year of normal use
And since your in there redo your pads and rotors or consider a upgrade “2020 calipers and rotors are a cheap way to go”
Of course fluids ,hoses belts etc as needed or if your budget allows should be changed,topped off and addressed but that goes for any vehicle
Hope this helps,gmt900s are nearly indestructible if attention is paid to small things and these common issue points addressed
