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Location:
middle of nowhere, Vermont
Registered:
October 2005
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A340H manual shifting
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Wed, 19 October 2005 02:32
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So, I killed the stock ECU in my '90 4runner with a 3VZE, A340H, and ADD front end. All I could get my hands on was an ECU out of a stick shift equipped runner. This is a wheeling truck that never sees any significant road driving.
Now, as was expected, the tranny will only shift when you manually select a gear. This wouldn't be a problem if I could select second gear! When the shifter is in 1, the tranny is in one, shifter in 2, tranny in 3, shifter in D, tranny in overdrive. I gather that this is a limp home mode, since the tranny no longer has a compatable ECU. How can I make the tranny shift correctly so that I can use second gear? I have no desire to use overdrive, unless it can be used as a spitter gear to essentially make the tranny a close ratio unit, like use overdrive in first when first is to low and second is to high a ratio.
The shop manual describes this tranny as a 3 speed planetary unit with a seperate overdrive, but by looking at the shifting solenoid's diagram, it looks like it is only possible to engage overdrive in third, but then I hear reports of it being able to engage in second in some applications under certain conditions so which is it?
Next question: How do you wire up a switch to the lockup converter? I would really like to be able to use engine braking offroad. I also think that it might allow me to bumpstart the motor if need be.
Will shifting the tranny, including the overdrive unit, with the torque converter locked up damage anything, or will it just shift really firm?
Also, as a side question, does the transfer case that is attached to this tranny only keep the front and rear driveshafts locked together, when in either 4high or 4low, when the engine is running?
Everyone else tells me to get the right ECU, which I know is the easiest, and most expensive (It is only a $200 truck), solution, but it also won't gain me anything other than a correctly shifting tranny. If I can make this tranny do what I want then I'll be one very happy camper, but this all could just be a pipe dream.
I noticed that there seemed to be some very brigth people on this board, and I was hoping that some of them could help me out with this self inflicted and unique problem. At this point, any comments are appreciated, cause wheeling with no second gear sucks!
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| | Subject | Poster | Date |
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A340H manual shifting
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meatmonkey | Wed, 19 October 2005 02:32 |
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Re: A340H manual shifting
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CrUZsida | Wed, 19 October 2005 05:04 |
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Re: A340H manual shifting
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mrshin | Wed, 19 October 2005 09:40 |
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Re: A340H manual shifting
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meatmonkey | Wed, 19 October 2005 11:24 |
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Re: A340H manual shifting
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mrshin | Wed, 19 October 2005 12:05 |
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Re: A340H manual shifting
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terra | Wed, 19 October 2005 15:53 |
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Re: A340H manual shifting
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meatmonkey | Thu, 20 October 2005 00:40 |
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Re: A340H manual shifting
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MS-75 | Thu, 20 October 2005 05:22 |
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Re: A340H manual shifting
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madmont | Thu, 20 October 2005 10:12 |
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Re: A340H manual shifting
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MS-75 | Thu, 20 October 2005 11:00 |
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Re: A340H manual shifting
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mrshin | Thu, 20 October 2005 12:23 |
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Re: A340H manual shifting
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meatmonkey | Thu, 20 October 2005 13:48 |
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