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Thread: new to GMC can anyone help?
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03-11-2009, 12:00 PM #1Jr. Apprentice
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new to GMC can anyone help?
i just got a 1990 gmc stepside 4x4 with a 5.7 a 4' lift and 33's on it and when i drive it feels realy slugish... its got a magnaflow cat back... take off is really slow.. can anyone help?
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03-11-2009, 12:57 PM #2Moderator
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Originally Posted by k_lakey
Welcome to the site.
Do you know what gears you have in it? It sounds like you may not have enough gearing for the size tires you are running.
You might also check the timing, if it is off it could cause sluggishness.Gary
99 K 1500 Suburban
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03-11-2009, 01:15 PM #3Legend
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I would agree about the timing, 33's are not significantly over sized so IMO they are less of a factor here. Still if the gearing has been changed from stock before then they become more of an issue.
BRYAN
"IF YOU DON'T TREAT IT LIKE A TRUCK IT'S JUST A REALLY BIG CAR"
02' Avalanche 2500 Onyx Black
8.1L Vortec
43,000 miles
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03-11-2009, 01:28 PM #4Legend
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Welcome to the site. You didn't mention, but considering the age of the truck you might want to check out the catalitic converters. They can cause a lot of issues when they go bad. Just a thought.
2010 Z/71 Colorado C/C
Black 4X4 w/5.3L V8
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03-11-2009, 01:30 PM #5Legend
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Make sure to have it scanned for codes. There may be a code stored in memory that can point to the power loss.
Jim
2004 SILVERADO 2500HD LS
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03-11-2009, 02:10 PM #6Jr. Apprentice
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i dont know what gears are in it... i think stock
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03-11-2009, 02:11 PM #7Jr. Apprentice
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and the catalitic converters looks new
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03-11-2009, 02:13 PM #8Legend
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An easy way to check the cat is by temperature. I picked up a cheap laser thermometer at Harbor Freight when I thought mine was going out.
Scott
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03-11-2009, 02:15 PM #9Jr. Apprentice
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how would i do this? Originally Posted by Jimmiee
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03-11-2009, 02:25 PM #10Legend
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Easiest way is to take it to Autozone. They will scan it for you for free.
Jim
2004 SILVERADO 2500HD LS
Pro Comp Leveling Kit
285-75-16 Cooper ST All Terrains
Pro Comp Programmer
Bilstein Shocks
Linux Bed Liner
Tinted Windows
Other rides:
1967 Landcruiser <350 Chevy>
1970 Camaro
1990 Geo Metro Convertible
2007 FJ Cruiser
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