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Old 03-17-2013, 04:49 AM
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Possible to add manual shift function to automatic?

I know the 2013 supersuties have a manual shifting option. Would it be possible to add this feature to older trucks? I had a BMW with this feature as well and I'm pretty sure it was just switches in the shifter that spliced into the tranny wiring harness and sent signals on when to shift.

Now I don't know much about transmissions but my thoughts are that there is a wire somewhere in the trucks wiring harness which sends a signal to the transmission to shift up and then another wire which tells the transmission to down shift. So I'm thinking if I could install two push buttons on to the back of the steering wheel that I could then splice them in to those two wires. From there would come the hard part which would be dealing with the computers and tuning. But I think with all the custom tuning options for these transmission that tune writers could figure out a way to set this up.

I have no problems with my trucks shifting now but I would like to have control over what gear I'm in, especially when towing.

Any thoughts?
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Old 03-17-2013, 04:52 AM
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Another hurdle to deal with would also be 4th gear.

But I think if someone could figure this out, it could be a popular modification.
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Old 03-17-2013, 05:42 AM
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I've been wanting to do this for awhile, but never thought of a way to it yet. Def hoping for some good info!
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Old 03-17-2013, 06:58 AM
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I actually researched this a lot when I was cramming a V8 into a Tacoma. The transmission that I was using was a 4 speed and had 2 shift solenoids it was a lot less complex than the 5R110. I wasn't able to figure out a way to run both the transmission control until and a type of paddle shift without going to a aftermarket tcu. It gets really complicated once you start looking into the percentage the torque converter should be locked up based on engine load and speed and how to control that.

I haven't looked into how the 5R110 utilizes the shift solenoids but usually a tranny uses the same solenoid for more than one gear so the best I could come up with was a button for each gear then relays that turned a certain solenoid on and another off depending on which gear you are commanding. For example 1st gear was both solenoids off and 2nd gear was solenoid 1 on and 2 off, 3rd was 1 off and 2 on and so on.

I do think this would be an awesome mod but I can't see doing it without an aftermarket tcu and then trying to get the ecu and tcu to cooperate would be a pita.
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