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Old 04-29-2019, 10:05 AM #16
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Don't want to necro a thread, but I'm very interested. @Jetboy , have you made any progress with this research?
No. I haven't followed up. I've been swamped with work for about the last year to the point that I'm working almost every day (including weekends). So my wrench time is very limited. After a bit more thought on it I do think you'd have to combine it with at least 4.56, but probably 4.88 diff gears to really use the extra OD.
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Old 04-29-2019, 11:35 AM #17
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It would probably be easier to use a 1GR to GM transmission adapter and an aftermarket tranny ECU such as TCI just because you have the option of an aftermarket ECU. Then you'll need a GM style transfercase.
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Old 04-29-2019, 01:15 PM #18
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Quote:
Originally Posted by Whippersnapper02 View Post
It would probably be easier to use a 1GR to GM transmission adapter and an aftermarket tranny ECU such as TCI just because you have the option of an aftermarket ECU. Then you'll need a GM style transfercase.
The point of the discussion here is to see two near-identical trannies with the difference of a couple solenoids, and how one could potentially give us a 6th gear without much extra work. I don't see how your suggestion would be any easier or any more useful, if it costs more and requires more parts to be replaced.
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Old 04-29-2019, 01:24 PM #19
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Quote:
Originally Posted by baysta View Post
The point of the discussion here is to see two near-identical trannies with the difference of a couple solenoids, and how one could potentially give us a 6th gear without much extra work. I don't see how your suggestion would be any easier or any more useful, if it costs more and requires more parts to be replaced.
See below post:

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Originally Posted by Turfboy View Post
I would think you have to get into the ECU program to evaluate it. It is kind of like the development of the supercharger where everything runs through the computer and while the mechanical side gets solved relatively quickly, no one knows how the electronics will respond. My guess is the whole enchilada is wrapped together (throttle, emissions, speed, gearing) but now that you bring it up someone on the site is bound to try it and I can watch.
"A couple of extra solenoids" could mean a different ECU, different wiring and maybe different external sensors. Replacement would be easier than digging into the harness and trying to find the correct ECU that will probably come from overseas. Will that ECU work with the VATS system in the US? Will it communicate with the 4wd ECU? US cluster? A couple of extra solenoids can add up to a lot more work than you think.
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Old 04-29-2019, 07:53 PM #20
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The overall transmission choices Toyota made in the 5th have always been one of my main complaints. I feel like a 6AT would go a long way to fixing that. Unfortunately, I am guessing the price for a swap would be comparable to simply going for a used GX....free V8!
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