trans rebuild shift question
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Elder User
Joined: Feb 2003
Posts: 895
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From: missoula montana
trans rebuild shift question
just had my tranny rebuilt with billet faced torque converter, spring and valve kit. the shifts are firmer and hold the gear longer on steep pulls doesnt shift in and out. but is there an adjustment for when the tranny kicks down and the rpms raise and lower (torque convertor lock unlock) so this dont drop the rpms as much with a full load?
Logistics Pro
Joined: Jan 2002
Posts: 3,733
Likes: 38
trans rebuild shift question
There are two things you might try.
First there is a mod that will allow you to put a switch to manually control the torque converter lock up. I did not do this mod but have seen it demonstrated with an auto trany on a dyno. Basically the guy did it so that on the dyno, he could control the TC and get truer rear wheel figures, but I figure that with the mod a driver could force the TC to stay locked longer up a hill.
That said this has the potetial to cause severe damage if you do not pay attention and unlock the TC when it is necessary for the trans to up or down shift.
You might also retrain your PMC.
There is a procedure for the adaptive portion of the PCM to "forget" it's current settings and revert to "basic" program. Simply remove the battery power for 8 or more hours. When you reconnect the battery the PCM will take the next two or three days worth of driving and re-adapt to your power and shift needs. If you were to do this re-learning with your heavy load and highway driving, then the new program will be different than if you did it with unloaded, city, stop n go driving.
First there is a mod that will allow you to put a switch to manually control the torque converter lock up. I did not do this mod but have seen it demonstrated with an auto trany on a dyno. Basically the guy did it so that on the dyno, he could control the TC and get truer rear wheel figures, but I figure that with the mod a driver could force the TC to stay locked longer up a hill.
That said this has the potetial to cause severe damage if you do not pay attention and unlock the TC when it is necessary for the trans to up or down shift.
You might also retrain your PMC.
There is a procedure for the adaptive portion of the PCM to "forget" it's current settings and revert to "basic" program. Simply remove the battery power for 8 or more hours. When you reconnect the battery the PCM will take the next two or three days worth of driving and re-adapt to your power and shift needs. If you were to do this re-learning with your heavy load and highway driving, then the new program will be different than if you did it with unloaded, city, stop n go driving.
Logistics Pro
Joined: Jan 2002
Posts: 3,733
Likes: 38
trans rebuild shift question
I am pretty sure the Tire RPM code sticks and is not effected by a power loss. I am somewhat of a computer geek/nerd and have tried several times to search for good technical literature on the Ford PCM but don't ever find the detail I desire.
Several years ago I had a set of Nissan shop manuals for 280 and 300Z cars. Those books described the ECM down to the smallest detail of firmware program code.
I was able (in mid '80s) to build my own "black boxes" to change the pulse duration and timing on a turbo 300ZX with a larger turbo, headers, and fuel injectors.
In essence I created my own custom "chip". I think there is a consperiacy to keep this knowledge from me as THEY know I don't have the time or equipment to reverse engineer the Ford PCM like Diablo and Superchip have.
Several years ago I had a set of Nissan shop manuals for 280 and 300Z cars. Those books described the ECM down to the smallest detail of firmware program code.
I was able (in mid '80s) to build my own "black boxes" to change the pulse duration and timing on a turbo 300ZX with a larger turbo, headers, and fuel injectors.
In essence I created my own custom "chip". I think there is a consperiacy to keep this knowledge from me as THEY know I don't have the time or equipment to reverse engineer the Ford PCM like Diablo and Superchip have.
