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2000 GMC Sierra jumps out of 1st gear

Tiny
BPEIFFER1
  • MEMBER
  • 2000 GMC SIERRA
  • 106,000 MILES
I have a 2000 gmc sierra with a 5 speed manual transmission and a 4.8 liter motor. When I start out sometimes it will kick out of 1st gear and go into neutral. It make a loud clunk sound. The shifter is as far up as it will go and it goes into gear fine.
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Thursday, November 7th, 2013 AT 10:26 AM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,968 POSTS
Check to make sure the linkage is properly adjusted and nothing is loose. If all looks good, I would question the synchronizers in the transmission. One may be bad.
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Thursday, November 7th, 2013 AT 12:24 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,968 POSTS
After thought. Are you sure the gear lube is clean and full in the transmission?
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Thursday, November 7th, 2013 AT 12:25 PM
Tiny
BPEIFFER1
  • MEMBER
  • 2 POSTS
Im not sure about the lube but I will check.
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Tuesday, November 12th, 2013 AT 8:40 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,968 POSTS
Let me know what you find. Also, in addition to making sure it is full, make sure it is clean.
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Tuesday, November 12th, 2013 AT 8:50 AM

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