How to Shift a Two Stick Transmission
Bubbles 8V92 Bubbles 8V92
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 Published On Oct 21, 2022

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One of the best examples here, I wish i was this good.

   • how to shift twin sticks spicer 6x4 t...  


Going over the two stick transmissions again. These are spicer transmissions, Consisting of two separate transmissions instead of a married box design like the macks used. I only put a couple hundred miles on this truck before i took it apart mainly to make sure the drivetrain was sound or what repairs it would need. The spicer was a staple of the 60's often coming in a 4+4 configuration then came the 5+4 and 6+4 Transmissions. Mine are both overdrive which means both sticks are against the dash in high gear. When i am in 5x3 i get my 1:1 ratio or what a 6+4 direct setup would be in high gear instead of my .68 high gear. i have a spreadsheet with all the ratios mapped out which can easily be made by multiplying all 24 gear combinations together. a lot of the gears overlap so you really dont need to shift many times to get progressive shifts, in fact its kinda nice to be able to pick whatever gears you like to get to speed in as few or many shifts as you would like. in fact when bobtailing you can get in high gear quite quickly without massive skip shifts like in a modern 18 speed. Its a little harder to run sticks with the 2 stroke as the snappyness of the motor makes timing a bit harder and the auxilary is really unforgiving especially the 3-4 shift.

1978 Peterbilt 359
475 Silver 8v92 100 mil injectors
6+4 Sicer O\D




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