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      02-05-2020, 01:57 PM   #8
pennsiveguy's Avatar

Drives: F15 xDrive50i M-sport
Join Date: Apr 2019
Location: Edina, MN

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I drove many thousands of miles in an old Peterbilt that had 2 transmissions. It was a popular way to gain lots of close-together gears so you could always find one just right for the speed, load, grade, etc.

It had a Spicer main box that was on the back of the engine, like any other transmission. It had 5 forward speeds plus reverse. Off the back of that was a short drive shaft that led to the font of the auxiliary transmission with 4 speeds (no reverse). So you had a total of 20 forward gears (gear combos, really) and 4 reverse.

Shifting that rig was quite an art. Not for the faint of heart. Looked something like this, when you got the knack of it:
2017 F15 xDrive50i M Sport | Superformance GT40 Roush 511 IR FE | 2006 Ford GT