Borg Warner Overdrive Installation in Torque Tube

Installing the Borg Warner R 10 Overdrive in the torque tube.

Cut out flanges to fit both ends of the overdrive from 3/4" plate,and cut the center holes to accept your torque tube.
You'll need to gather a coupler for the input and output shafts. Some machine work will likely be required to fit them to your shafts. The rear one will be welded to the drive line and a seal will need to be fit at that point so your overdrive lube will not run to the rear end. The output shaft will slide into the fixed coupler on the rear driveline. This will allow easy installation of the complete unit. Weld the front coupler to the front portion of the drive line. This end will be pinned to the input shaft on the overdrive unit so it doesn't travel forward.
You will need to install a fairly large vent out the top of the overdrive unit, similar to the rear end vent but more like a 1/4" to 3/8" vent. The overdrive will generate substantial heat and therefore the use of synthetic gear lube is recommended.
The custom, extended speedometer cable will need to be a sealed casing as the oil will travel up the cable. Cap the speedo output on your transmission.
You will need an overdrive relay unit. I used a Ford or Merc. relay.  The relay is triggered by a governor on the overdrive unit, that grounds the trigger circuit at 25 mph and sends power to the solenoid by 10 gauge wire, which will allow it to go into overdrive mode if your cable control is at the "in" position.
I used a Packard cable as I figured it was a little longer so as to compensate for the overdrive being back in the middle of the torque tube. I formed the mounting bracket for the cable so that it slides down onto my shifter and acts as a tapered, compression fit.
I use a toggle switch to break the governor circuit, to the relay, so I can split gears. Cable in, switch on, 1st- clutch- 2nd- throttle off clutch in- 2nd over throttle and switch off, throttle off for 3rd-throttle- switch on, throttle off for 3rd overdrive, now you're cookin'.
 I use clutch for the second over but not for 3rd over. It's a little to snappy or violent for second over in my opinion without the clutch. This will get you down the road in a "wow" fashion. At least that is what everyone says that rides in my truck.
Get very accustomed to the shifting before you try to speed shift.
You must not pull the cable out of gear when you are in overdrive mode and you must not engage cable when the solenoid is engaged.
It is best to not move your cable when in motion, until you have very good understanding of how the system works. I take it out of cable overdrive after I have switched it off and come out of solenoid overdrive and snugged the gears forward.
If you are not completely confident with your understanding of the shifting sequence, it is just safe to not move the cable when in motion. The only reason to pull the cable out when in motion is to take it out of "free wheel". Normally it was not designed to do that and had a built in safety device.
I have put 35,000 miles on mine at this point and it is still working great. There were trials and errors but if you follow my directions here, you should have a fail safe installation.
Doug's Classic Coachworks                                                                                       

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