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Blue Nile trucker

High RPM

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Hey everyone 

i got 2007 Mack chn613  which came with Mack transmission but I jst swapped it with Eaton transmission everything went smooth but now when I drive it the rpm is very high can’t go no faster than 40 mph what should I do?

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That’s messed up...... you need to work backwards and figure out what your transmission is in terms of model and what your top ratios are....list your trans model and diff ratio and tire size on the thread. Someone will do your calc. 

Edited by Mack Technician

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1 hour ago, Blue Nile trucker said:

Hey everyone 

i got 2007 Mack chn613  which came with Mack transmission but I jst swapped it with Eaton transmission everything went smooth but now when I drive it the rpm is very high can’t go no faster than 40 mph what should I do?

Put a Mack transmission back in.

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Shift to a higher gear?... 

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Any trans will go over 40mph  Are you sure its going into high range.?

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Put a Mack back in, best thing he ever did was take the Mack out, just needs to find out what he messed up, maybe a underdrive now he is in direct, or .83  and had a Mack 5/6 speed never said what trans he took out, could be running 5. something ratio and a Fuller with direct or ? would give him no roadspeed.

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It's gotta be getting to high range to hit 40 mph. We have no idea what trans came out and what went in. He may be clueless on the shifting pattern.  But unless he comes back here were all shooting in the dark. He's probably already figured it out.

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