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Mack 13 Speed to 18 Speed Conversion


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  • 2 weeks later...

To do it the proper way there is also a piece on the trans a plate of some sorts that has to be changed. When I worked at Mack the mechanics did quite a few of these on new trucks that were ordered as 13's and customers changing their minds. This was back in the late nineties.


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12 hours ago, Macktech20 said:

The way I have always done it. Is to remove the shifter knob cover. Take the nut and the washers off of the top. Take the two torx headed screws out of the top. Then your knob comes apart in two pieces. Leave the bottom of the knob on the stick. Theres going to be a thin plastic tab on the red compound switch, cut it off and then put the knob back together now you have an 18 speed

Yup Job Done!

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