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4X4 shift question.

Tiny
WESTY
  • MEMBER
  • GMC C1500
2004 Sierra, auto, 4x4 shift on floor hump.
Is it normal for the shift from 2 wd to 4 wd high to make a grinding noise sometime when its cold outside? GM says I can "shift on the fly"at some reasonable speed, but I have been shifting from a dead stop for fear of trashing the tranny. I thought I could shift with the truck moving, thus the "shift on the fly" terminology. Other than that the tranny drive is fine.
Thanks
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Saturday, November 3rd, 2007 AT 3:46 PM

3 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Yes you should be able to shift on the fly but I wouldnt attempt it. I usually do it on the stop it is a lot safer I have never shifted a shift on the fly with the truck moving. Check for proper fluid level, the automatic hubs might not be locking also for the shift on the fly to work.
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Saturday, November 3rd, 2007 AT 7:56 PM
Tiny
WESTY
  • MEMBER
  • 5 POSTS
I posted my thanks earlier, but didn't see it on the site. I'm posting my thanks again.
Westy
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Friday, November 9th, 2007 AT 6:48 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
No problem mate, proud to help ya.
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Friday, November 9th, 2007 AT 7:50 PM

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