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'99 - '06 GM Truck Modifications
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Engine & Performance
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Engines, Engine mods, Chips, Filters, etc.
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Engine hours meter reset question
jobey
Jan 30, 2026
Replies
10
Views
521
Feb 5, 2026
JorgeS
Engine Color Schemes! Post em' up!
Mikloangelo
Feb 2, 2026
Replies
11
Views
435
Feb 3, 2026
stutaeng
GMT800 SUV
stutaeng
Jan 30, 2026
Replies
1
Views
168
Jan 31, 2026
Marky Dissod
M
Upgraded Transmission/oil lines?
Mikloangelo
Jan 28, 2026
Replies
8
Views
532
Jan 30, 2026
AuroraGirl
T
Upgrades.
Tommye
Jan 21, 2026
2
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22
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1K
Jan 26, 2026
Tommye
T
Aftermarket for the 8.1L
bigolebetty01
Jan 22, 2026
Replies
5
Views
363
Jan 25, 2026
bigolebetty01
Should I?
Mikloangelo
Jan 10, 2026
Replies
9
Views
656
Jan 13, 2026
xdmtoter
X
J
Newby wants to know
James2nd
Jan 5, 2026
2
Replies
20
Views
925
Jan 10, 2026
99Sierra2500
T
2003 6.0 2500 burban. With knock.
Tommye
Dec 2, 2025
Replies
13
Views
663
Dec 5, 2025
Marky Dissod
M
G
Passing smog
Gavin
Nov 30, 2025
Replies
16
Views
743
Dec 5, 2025
99Sierra2500
M
3pc engine cover set
mars2878
Nov 30, 2025
Replies
4
Views
335
Dec 1, 2025
mars2878
M
Solved -Normal scan tool values
SK101
Aug 6, 2025
2
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20
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2K
Nov 24, 2025
ORVietVet
B
2006 4.3 P0200 code, running rough
BleedinBowties
Nov 21, 2025
Replies
5
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447
Nov 21, 2025
BleedinBowties
B
J
P1516 and other random errors
jpkc97
Oct 20, 2025
Replies
4
Views
417
Oct 21, 2025
Tonimus
Is there a way to remove the oil filter w/o spilling oil?
stutaeng
Oct 10, 2025
2
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24
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1K
Oct 18, 2025
ORVietVet
LSX454
99Sierra2500
Oct 1, 2025
2
Replies
25
Views
976
Oct 3, 2025
99Sierra2500
Command start killing battery?
SK101
Sep 29, 2025
Replies
9
Views
451
Oct 1, 2025
ORVietVet
K
2003 Chevy Tahoe 5.3L Coolant Pouring out at the back of the engine
Kuroyabumozu
Sep 26, 2025
Replies
9
Views
790
Sep 29, 2025
SK101
B
Engine not starting due to weird electrical
BrandinB
Sep 15, 2025
Replies
4
Views
537
Sep 16, 2025
BrandinB
B
G
02 avy swap help needed
glsawyer
Sep 14, 2025
Replies
2
Views
377
Sep 14, 2025
glsawyer
G
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