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02-07-2006, 05:01 PM
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Hummer Authority
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Join Date: Apr 2005
Location: Ouside MN's 5th Congressional District, MN
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I just recently had my slip yoke replaced to correct the bump issue. Now, if I run in any of the lock modes and then switch back to 4-high, it doesn't immediately unlock the transfer case. The 4-high unlocked mode light is lit, but the transfer case is still locked...when turning you can hear the strain on the tcase and the tires will skip/shudder as expected. If I backup, 25 feet, 50 feet, a couple hundred feet, it's still locked. If you drive straight about several hundred feet 0.1 to 0.2 more more miles, it unlocks. This is very repeatable, but not how it worked before the slip yoke replacement.
Is this clearly abnormal behavior or might I have to fight with the dealer to get it corrected?
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'03 pewter base H2
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02-07-2006, 05:01 PM
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Hummer Authority
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I just recently had my slip yoke replaced to correct the bump issue. Now, if I run in any of the lock modes and then switch back to 4-high, it doesn't immediately unlock the transfer case. The 4-high unlocked mode light is lit, but the transfer case is still locked...when turning you can hear the strain on the tcase and the tires will skip/shudder as expected. If I backup, 25 feet, 50 feet, a couple hundred feet, it's still locked. If you drive straight about several hundred feet 0.1 to 0.2 more more miles, it unlocks. This is very repeatable, but not how it worked before the slip yoke replacement.
Is this clearly abnormal behavior or might I have to fight with the dealer to get it corrected?
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'03 pewter base H2
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02-07-2006, 05:10 PM
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Hummer Messiah
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I think it's normal. It doesn't unlock right away. I know Paragon's is the same, and our old truck, too.
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"My reading of history convinces me that most bad government results from too much government."---Thomas Jefferson
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02-07-2006, 05:20 PM
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You need to get an alignment.
Mine worked the same way, until I took my truck in to see the Transfer Case Whisperer. Now, it unlocks immediately.  Just kidding of course, mine does work just as you described, as did my Tahoe (which was a real PITA to get out of 4-Low). |
02-07-2006, 05:45 PM
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Hummer Guru
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by KenP:
I think it's normal. It doesn't unlock right away. I know Paragon's is the same, and our old truck, too. </div></BLOCKQUOTE>
That's interesting. My 03 Sierra and my new H2 both go from 4-hi locked to 4-hi almost immediately. Though, on the H2, I've only done it twice; on the Sierra, 4Hi unlocked was called "4WD Auto."
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02-07-2006, 06:21 PM
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by PhilD:
Mine unlocks straight away </div></BLOCKQUOTE>
As beat-to-hell as your undercarriage is, I'm surprised it stays locked in the first place!  |
02-07-2006, 07:18 PM
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Ok, need some clarification. It's impossible for it to "stay" in 4Lo with 4HI unlocked lit up and THEN switch to true 4HI while moving.
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02-07-2006, 07:26 PM
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Hummer Authority
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by PARAGON:
Ok, need some clarification. It's impossible for it to "stay" in 4Lo with 4HI unlocked lit up and THEN switch to true 4HI while moving. </div></BLOCKQUOTE>
Clarification
Either scenario shows the problem:
Scenario 1
1) I'm in 4-hi locked
2) while rolling, I hit 4-hi
3) 4-hi button blinks a moment and then stays solid (i.e. it tells me i'm in 4-hi)
4) while rolling, turn side to side, hear strain on transfer case and tires shimmy (tcase is still locked)
5) drive carefully avoiding sharp turns for a couple blocks, slow down turn, no more strain and tires roll smoothly (tcase unlocked).
Scenario 2
1) I'm in 4-lo locked
2) while barely rolling, I pop it in neutral and hit 4-hi locked
3) 4-hi locked selector button light blinks for a moment, tcase thunks (sometimes), then light stays solid on 4-hi locked
4) continue from #1 of scenario 1.
I'm not concerned with the rear diff lock, just the transfer case.
Or do I need clarification about what you need clarification on? 
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'03 pewter base H2
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02-07-2006, 08:31 PM
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More better.
No problems going from 4LO to 4HI unlocked?
I'll see if I have provided an explanation for this before, if not, I'll make one up. |
02-07-2006, 08:41 PM
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Hummer Messiah
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How about the Syncro's haven't popped because there's still stress on the diff?
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02-07-2006, 08:49 PM
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by KenP:
How about the Syncro's haven't popped because there's still stress on the diff? </div></BLOCKQUOTE>You would know about things "popping" in the Tcase, wouldn't you. |
02-07-2006, 08:52 PM
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Hummer Messiah
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by PARAGON:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by KenP:
How about the Syncro's haven't popped because there's still stress on the diff? </div></BLOCKQUOTE>You would know about things "popping" in the Tcase, wouldn't you. </div></BLOCKQUOTE> 
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"My reading of history convinces me that most bad government results from too much government."---Thomas Jefferson
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02-07-2006, 09:47 PM
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Hummer Authority
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by KenP:
How about the Syncro's haven't popped because there's still stress on the diff? </div></BLOCKQUOTE>
How about you provide an explanation why this a slip yoke replacement would cause me to go from an clean, immediate, syncro-popping tcase unlock before the repair, to the behavior I now see.
I guess I'm fine with it if it's pretty normal. I'm just curious why the change.
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02-07-2006, 09:55 PM
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Hummer Expert
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Are you on soft material? Or blacktop when this is happening?
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02-07-2006, 09:57 PM
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Hummer Expert
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Why did you change the slip yoke??
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02-08-2006, 12:57 AM
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Hummer Authority
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Dug2x8:
Are you on soft material? Or blacktop when this is happening? </div></BLOCKQUOTE>
Packed snow/ice, hard pack frozen dirt, and blacktop. By snow/ice, I mean, change into 4-hi in the snow and drive onto blacktop nearby and it's still locked.
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Why did you change the slip yoke?? </div></BLOCKQUOTE>
TSB #01-04-17-004B. Mine was clunking on accelerate and getting very annoying.
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02-08-2006, 12:58 AM
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Hummer Authority
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by PARAGON:
No problems going from 4LO to 4HI unlocked? </div></BLOCKQUOTE>
I don't know. I'll check if it does the same thing for that shift tomorrow.
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02-08-2006, 01:03 AM
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FYI, mine does the exact same thing ree. Once I pulled over and went to 4 LO and back to 4 high and it went immediately the second time.
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