2000 GMC Sierra jumps out of 1st gear

2000 GMC SIERRA
106,000 MILES
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BPEIFFER1
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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.
Nov 7, 2013 at 10:26 AM
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JACOBANDNICKOLAS
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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.
Nov 7, 2013 at 12:24 PM
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JACOBANDNICKOLAS
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After thought... Are you sure the gear lube is clean and full in the transmission?
Nov 7, 2013 at 12:25 PM
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BPEIFFER1
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im not sure about the lube but i will check.
Nov 12, 2013 at 8:40 AM
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JACOBANDNICKOLAS
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Let me know what you find. Also, in addition to making sure it is full, make sure it is clean.
Nov 12, 2013 at 8:50 AM