switching 727 to A518
06-03-2007, 06:24 PM
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switching 727 to A518
That should be pretty straight forward right? hmmm maybe not. Any one done it before? Id throw a floor shifter in.
06-03-2007, 07:29 PM
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I thought the module just controls the overdrive. A switch on the dash could handle that from what I've read here. You do have a crossmember and drive shafts to deal with though.
Ryan
Ryan
06-03-2007, 08:15 PM
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Hmmm... thatd be cool, a switch to control overdrive. Im sure something could be rigged up, no need for a temp switch to diddle with. Im really curious about this now. If some one could measure tranny length, n compare cross members thatd help a lot. Heck I bet a conversion like that would be very popular. Maybe even a sticky! lol
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06-03-2007, 09:45 PM
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This is my second try for a post on this thread. My computer or my computer skills are lacking.
When I upgraded the TC, flexplate and valve body, it was suggested to me by Tim to upgrade to a 47rh. They handle more torque than a A518 and you have the advantage of a lockup. I was stubborn and cheap so I stayed with mine. The A518 is longer than the 727. The od unit was added between the tailshaft housing and the tranny. It is actuated by a solenoid valve in the valve body which is switched on the ground side by the PCM. We had a little trouble with mine when we did the valve body so I put a switch in the cab to make it work until I could get it in the shop again to fix the wire. It worked just fine manually. The o/d cannot be engaged unless the tranny is in third. Something about the way fluid is channeled thru the tranny.
When I upgraded the TC, flexplate and valve body, it was suggested to me by Tim to upgrade to a 47rh. They handle more torque than a A518 and you have the advantage of a lockup. I was stubborn and cheap so I stayed with mine. The A518 is longer than the 727. The od unit was added between the tailshaft housing and the tranny. It is actuated by a solenoid valve in the valve body which is switched on the ground side by the PCM. We had a little trouble with mine when we did the valve body so I put a switch in the cab to make it work until I could get it in the shop again to fix the wire. It worked just fine manually. The o/d cannot be engaged unless the tranny is in third. Something about the way fluid is channeled thru the tranny.
06-03-2007, 09:46 PM
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I would do the shifter OD button from a 94'-up and not worry too much about it. The only real challenge would be if it was an early 2wd, the tunnel is smaller. Compare one to a 4wd trans tunnel some time you'll see what I mean. If I am not mistaken the later trucks (91.5'-93') came with the larger square 4wd tunnel.
06-03-2007, 10:15 PM
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I've done it........I took out a Getrag and put in a 518...I wanted and exhaust brake so I then took out the 518 and put in a 47RH. You just need one simple switch to send a ground signal to the o/drive solenoid to turn it on when you want it on the 518. You will need 2 on a 47RH(one for overdrive, and another for lockup. If you are contemplating a 518, by all means I recommend the 47RH!!!! The lockup torque convertor is far superior than a non lockup tranny.
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