Overdrive, Can I make it Work ?

[Roger the Dodger]

I bought this overdrive and parts yesterday. But I did not get the gearbox part only the casing. I put the standard case and o/d cases together and I can see I need more parts, because of the extra holes. What do I need ? I have a spare 3 speed complete, is it possible to use the gears and shafts out of this in the o/d case plus whatever else is needed ? Thanks, Roger.

[1941Rick]

Yes......change out the mainshaft from your 3 speed, make sure the case you use is the one you have the drill bit on. A hint that was passed on to me is to use an elastic band to hold the rollers on the sprag clutch when assembling the O/D.....

[martybose]

Isn't there also an OD-unique reverse gear shifter that goes through the case into the OD unit to force it into direct when you shift into reverse?

Marty

[blueskies]

I used the gears from my stock three speed in my OD rebuild. The reverse shift rail in the OD case is longer, and extends into the overdrive half to the reverse lockout switch.

Pete

[1941Rick]

The shift rail in the OD extends into the main transmission...When you have selected OD and use reverse the reverse shift rail shifts the OD out, if you follow my drift....a word of caution...when you have selected OD with the dash control and park the car, it will freewheel so always select no OD and set the park brake

[Roger the Dodger]

Thanks for the replies. So the extended reverse shift rail is the only part I am missing?

If anyone else has any comments, feel free to chime in.

Thanks, Roger.

[suntennis]

If you do not have a book on OD or at least the shop manual, there is an excellent web site if it is still up that shows rebuild of an OD. Check out http://www.classictruckshop.com/clubs/earlyburbs/projects/t85n/rebuild.htm

[Frank Elder]

If you do not have a book on OD or at least the shop manual, there is an excellent web site if it is still up that shows rebuild of an OD. Check out http://www.classictruckshop.com/clubs/earlyburbs/projects/t85n/rebuild.htm

Wow..thank you for sharing, good tech post....maybe a sticky in the technical archives.

[Jim Yergin]

You can also find a download of the Borg Warner Overdrive Manual in the Downloads section of P15-D24.Com. I found it very helpful.

Jim Yergin

[Roger the Dodger]

You can also find a download of the Borg Warner Overdrive Manual in the Downloads section of P15-D24.Com. I found it very helpful.

Jim Yergin

If you do not have a book on OD or at least the shop manual, there is an excellent web site if it is still up that shows rebuild of an OD. Check out http://www.classictruckshop.com/clubs/earlyburbs/projects/t85n/rebuild.htm

Thanks, I found both of these yesterday by searching old posts. Roger.