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Tech & Fab
Down and Dirty Transaxle Build
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<blockquote data-quote="patooyee" data-source="post: 467467" data-attributes="member: 483"><p>Your shifts are controlled by solenoids a & b. I'm fairly certain all 4t65e's use the same shift control logic but if you give me the exact year, make and model of your donor I can make sure to post your exact logic. The GM performance build book explains how to simply wire up 2 toggle switches. Choosing which gear you are in is simply a matter of memorizing all 4 possible combinations of on / off for each one. BUT a really smart person could simply figure out a way to build some micro switches into a lever shifter that would work in the same way as the toggle switches. It would only take 2 micro switches and 4 5-pin relays. </p><p></p><p>If you leave the PC valve unhooked the trans defaults to full line pressure for shifts. I have heard that isn't half bad and for us it probably advantageous for trying to get to reverse quickly.</p><p></p><p>By eliminating the PC valve and the solenoid valve logic all that's left for the TCM to do is control TC lockup, which is a PWM valve. Its a special converter that allows gradual lockup based on pulse width supplied by the TCM without wearing out like a conventional converter would. You would have to look into that. You might be able to just wire that up on a switch also which would then eliminate the TCM entirely. In fact, now that I think about it, I want to say I have read about someone who did this.</p></blockquote><p></p>
[QUOTE="patooyee, post: 467467, member: 483"] Your shifts are controlled by solenoids a & b. I'm fairly certain all 4t65e's use the same shift control logic but if you give me the exact year, make and model of your donor I can make sure to post your exact logic. The GM performance build book explains how to simply wire up 2 toggle switches. Choosing which gear you are in is simply a matter of memorizing all 4 possible combinations of on / off for each one. BUT a really smart person could simply figure out a way to build some micro switches into a lever shifter that would work in the same way as the toggle switches. It would only take 2 micro switches and 4 5-pin relays. If you leave the PC valve unhooked the trans defaults to full line pressure for shifts. I have heard that isn't half bad and for us it probably advantageous for trying to get to reverse quickly. By eliminating the PC valve and the solenoid valve logic all that's left for the TCM to do is control TC lockup, which is a PWM valve. Its a special converter that allows gradual lockup based on pulse width supplied by the TCM without wearing out like a conventional converter would. You would have to look into that. You might be able to just wire that up on a switch also which would then eliminate the TCM entirely. In fact, now that I think about it, I want to say I have read about someone who did this. [/QUOTE]
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