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4X4H Launch Question

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Old Aug 15, 2004 | 01:43 PM
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mbnv992's Avatar
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4X4H Launch Question

For those of you who launch in 4X4 High, when are you supposed to turn it back to 2WD ??? Won't leaving it in 4X4 in too high of speeds ruin the tranny ????
 
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Old Aug 15, 2004 | 02:47 PM
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2WD and 4 HIGH doesn't change the gearing and shouldn't hurt the tranny at all . Running 4X4 on the streets in a straight line shouldn't hurt anything , it's when you make turns you start putting alot of stress on the front end .
Just my $0.02 worth
 
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Old Aug 15, 2004 | 03:06 PM
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You can switch it back to 2WD as soon as you leave the starting line but it won't affect anything. The load on the tranny will prevent it from disengaging until you let off at the end of the 1/4 mile.
 
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Old Aug 15, 2004 | 05:15 PM
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Originally Posted by darylhunter
You can switch it back to 2WD as soon as you leave the starting line but it won't affect anything. The load on the tranny will prevent it from disengaging until you let off at the end of the 1/4 mile.
I don't know what it is, but if I put it back into 2wd after launch, I feel a clunk from 3rd to 4th gear as it shifts...its not a shift, it *feels* like the 4wd disengaging...but I don't really know for sure. It could be some slack in the front driveline, but it only does it from 3rd to 4th and none of the other gears...
 
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Old Aug 15, 2004 | 08:39 PM
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Heard something the other day that it MAY be better to have it in tow/haul ???

holds the shifts a BIT longer maybe ???

Have not tested it, but may be worth trying...
 
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Old Aug 15, 2004 | 08:43 PM
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SpartanDieselTech
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From: Hendersonville, NC
Originally Posted by jdadamsjr
Heard something the other day that it MAY be better to have it in tow/haul ???

holds the shifts a BIT longer maybe ???

Have not tested it, but may be worth trying...
Common sense would say you are right.

Driving around town, the Tow-Haul seems to make it a tad quicker.

I am so used to running it (mine practically stays in Tow, the minute I start it up I hit the button) its hard to tell anymore though.
 
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Old Aug 15, 2004 | 09:03 PM
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running the truck in tow haul mode you dont get max hp and tq out of it, you get max hp and tq w/o tow haul mode on but it would seem like the tow haul mode would be better because it holds the shift longer
 
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Old Aug 15, 2004 | 09:09 PM
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From: Hendersonville, NC
Originally Posted by southernfordman
running the truck in tow haul mode you dont get max hp and tq out of it, you get max hp and tq w/o tow haul mode on but it would seem like the tow haul mode would be better because it holds the shift longer
Explain
 
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Old Aug 15, 2004 | 09:14 PM
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From: stoneboro, pa
Originally Posted by jdadamsjr
Heard something the other day that it MAY be better to have it in tow/haul ???

holds the shifts a BIT longer maybe ???

Have not tested it, but may be worth trying...
i think it will hold on to the gear too long with the predator tho. the scmt makes its power up top so it may be good there.....

with a tq curve like the predators, u want to keep the tranny shiftin.....
 
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Old Aug 16, 2004 | 11:28 PM
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ONLY reason I brought this up is that it came from a source that does a LOT of drag racing....
will have to do some testing of my own to see
 
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