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Thread: No Fourth Gear!
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12-21-2006, 05:50 AM #1
- Join Date
- Oct 2005
- Location
- Raleigh, North Carolina
- Age
- 48
- Posts
- 368
Black- Murdered 2006 GMC Sierra
No Fourth Gear!
I for some reason cannot shift into fourth. Clutch or no clutch it just grinds. I can sometimes get it in if and only if it is while slowing down. All other gears work perfect and I have never had any tranny probs. HELP!!!
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01-04-2007, 01:28 PM #2
Sounds like an internal transmission problem. Need more info!
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01-05-2007, 04:48 AM #3
- Join Date
- Aug 2005
- Location
- metro Detroit area
- Posts
- 300
Your 3/4 shift fork is wallowed out and preventing a full engagement of the synchro sleeve( what gets the gear). This is a well documented problem and the fix is as well= replace the fork with an iron one. It will require a full teardown of the trans.
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01-05-2007, 06:56 AM #4
Is your 3rd gear fine, i.e. it goes in smoothly all the time and doesn't pop out?? Because a bent or damaged shift fork will usually affect both gears it controls, so if the 3/4 shift fork is damaged, both gears should be having issues. It is possible that is only affects 4th gear, but its less common.
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