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Who has a Spicer 10 speed in their Mack CH613?


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I have a Mack CH613 with a 350 HP E7, Mated to a Spicer 10 speed. The transmission started to pop out of gear Monday afternoon when I was leaving town, did it here and there 20 minutes apart. By the time I reached Beckley, WV, it wouldn't stay in 10th gear without holding it in gear, also lost that position in low range, 5th does the same. I will stay in gear if I'm coasting down hill but with any gas, it pushes out into neutral. (with force, its not just falling out) Seems to also use secondary air pressure when I driving, only when I driving. If I park in low range, or high range, it doesn't leak... strange.. So unless someone knows of something cheap, Its going to Tidewater Mack for either a transmission rebuild or a reman (What do you'll think?) for around $6,000. Any thoughts would be great! Thanks.

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