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10-01-2003, 02:15 PM
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Muncie tranny question
I have a Muncie in my '67 GMC truck that grinds a little going into 4th gear and back-shifting into 3rd. It only happens after the gear oil is warmed up. I put SAE 85-140 Turco in it, but that didn't stop it. It has plenty of clutch throw.
Are there springs under the synchros that stop the front shaft freewheeling? I'm not a tranny heavy. Can anybody shed some light on this? 
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10-01-2003, 08:01 PM
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The condition you describe is due to worn out synchros or a bearing about ready to depart, the assembly is moving and the synchro teeth and dogs can't slow the gear down, grind,,,, as it gets worse it will start popping out of gear.
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10-02-2003, 04:53 AM
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Time for new synchros.
Vince
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10-02-2003, 12:17 PM
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Muncie tranny ?
Thanks, guys, for the info!
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