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Grinding 3rd Gear- 39 Buick 40 series


Guest Miller1212

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Guest Miller1212

What would cause grinding of gears shifting into 3<SUP>rd--</SUP> only after the transmission has warmed up?<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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Miller1212, I had the same issue when shifting into second and third. I started using SAE250 gear oil in the transmission and that really reduced the problem. I think the modern SAE weights are thinner than the older oils and when they heat up the gears start clashing more because things are spinning faster. I still get a clash into third sometimes, but if I double clutch it rarely happens. Hope this helps your Texas friend.

John

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