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Go Back   Chevy and GMC Duramax Diesel Forum > Chevy / GMC Duramax 04.5-05 LLY Forum > 04.5-05 LLY Performance Parts Discussion
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04.5-05 LLY Performance Parts Discussion Discussion of Performance Parts For the 04.5-05 LLY Duramax Trucks No Advertising

 
       

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Old 11-18-2008, 12:06 PM   eBay Motors   #1 (permalink)
NJDuramax
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4WD launch

Ok so i'm going to the track tonight with some of my buddys and im wondering about 4wd launching. I did it when i had stock tires and everything was fine, now i have a truxx leveling kit with 1in blocks in the back with 33x13. I have the fabtech HD tie rods. Is it safe to launch in 4wheel? If so at what psi. Thanks
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Fabtech HD tie rods

For all your wheel and tire needs visit http://www.discounttiredirect.com
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Old 11-18-2008, 12:26 PM   eBay Motors   #2 (permalink)
TYREBOYZ_DEMAXIN
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dont launch unless you have the centerlink done..its up to you but i'm thinking you'll bust the front end since the only thing different is the size of the tie rods..
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Old 11-18-2008, 12:32 PM   eBay Motors   #3 (permalink)
BigRedChevy
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I think you would be ok for a low boosted launch without the centerlink, but i wouldn't do any high boost launches.

What kind of angle does your CV shaft have? If it is very sharp you may want to drop your t-bars down some for the track.
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Old 11-18-2008, 12:33 PM   eBay Motors   #4 (permalink)
1997whitefozo
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Dumb question, but what is the centerlink mod?
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Old 11-18-2008, 12:35 PM   eBay Motors   #5 (permalink)
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it is a straight center link that is needed to prevent tire "toe in" caused by the stock centerlink rotating, which changes the steering geometry and allows the tires to turn in tward eachother while pulling or dragracing in 4x4.
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Old 11-18-2008, 12:45 PM   eBay Motors   #6 (permalink)
1997whitefozo
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so its the "center link" between the 2 tie rods. lol Got ya, I didnt know those flexed under a 4wd launch, thought it was only the tie rods
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Old 11-18-2008, 12:48 PM   eBay Motors   #7 (permalink)
BigRedChevy
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they don't really flex, they rotate because the stock ones are not a straight design.
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Old 11-18-2008, 12:57 PM   eBay Motors   #8 (permalink)
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I have the Fabtech Tie rods and no centerlink w/ 35's and a 8" lift, my truck is doing fine with me 4wd launching... just launch from 11-13psi and if the truck starts hoping around, let of...
But it would be a good idea to change that centerlink...

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Old 11-18-2008, 01:01 PM   eBay Motors   #9 (permalink)
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oh got ya! Thanks guys
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Old 11-18-2008, 01:17 PM   eBay Motors   #10 (permalink)
NJDuramax
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now that you mention it, i am a little worried about the CV angles. maybe 4wd launch isnt a good idea for my truck the way it is right now. Thanks guys gonna see what 2wd times i can get my truck the same way it is with stock suspension ran 14.5 in 4wd. this is my first time to the track with new tires
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05 lly EC SB
5" mbrp turbo back(straight piped)
MBRP 3" downpipe
S&B intake
PPE standpard
Truxx leveling kit
325/60R18 Nitto terra grapplers on black XD hoss rims
Fabtech HD tie rods

For all your wheel and tire needs visit http://www.discounttiredirect.com
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