Don't think they exist for a 904.
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| Electronic controlled shift points of a 904 https://slantsix.org/forum/viewtopic.php?t=48569 |
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| Author: | Bren67Cuda904 [ Wed Apr 18, 2012 9:38 am ] |
| Post subject: | Electronic controlled shift points of a 904 |
I'd like to control the shift points of my 904 electronically. Did any of the later model 904s  come with electronic solenoids? I've got a friend that can build the controlling circuits and logic as long as there are solenoids that he can energize. I'm pretty sure that I have all the other inputs that he would need, as my barracuda  is already fuel injected. We can pull signals from TPS and MAP sensors to calculate load. I also have a gear vendors overdrive, which I can pull a speed signal from. Over the years I've played with the shift points so many times and still can't get it to shift when I want it to. I really do not want to go with a manual valve body. Anybody know of a late-model valve body with electric solenoids that will fit on here or an aftermarket piece? |
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| Author: | Rick Covalt [ Wed Apr 18, 2012 3:02 pm ] |
| Post subject: | |
Don't think they exist for a 904.
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| Author: | SlantSixDan [ Wed Apr 18, 2012 3:23 pm ] |
| Post subject: | |
Ugh. |
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| Author: | emsvitil [ Wed Apr 18, 2012 3:34 pm ] |
| Post subject: | |
You could put a manual shift body on the tranny, then Make a servo mechanism to do the manual shifting......... |
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| Author: | Joshie225 [ Wed Apr 18, 2012 3:58 pm ] |
| Post subject: | |
He's got a 318 in the car. He can put in an electronic A500 (42RE), but the floor and torsion bar crossmember will need to be modified. |
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| Author: | slantzilla [ Wed Apr 18, 2012 4:32 pm ] |
| Post subject: | |
Check Turbo Action. They make an electronic valve body for the 904/727. http://www.turboaction.com/17255E%205-20-04.pdf |
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| Author: | Rick Covalt [ Wed Apr 18, 2012 4:51 pm ] |
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Shows what I know !!! Nuthin |
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| Author: | ceej [ Thu Apr 19, 2012 9:59 pm ] |
| Post subject: | |
Nice setup! Under $700 too... Now that would take a bunch of the work out of setting up an A904!  Woulda saved me a ton of time fussing with the governer and shift shims, springs and so forth. '71 and newer trans, and deep tranny pan required I note. CJ |
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| Author: | WagonsRcool [ Fri Apr 20, 2012 11:42 am ] |
| Post subject: | |
The pdf lists "positively not for street use" - this is a race trans valve body- no accumulator, reverse pattern, no back band apply in manual 1st, etc. |
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| Author: | emsvitil [ Fri Apr 20, 2012 1:50 pm ] |
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Also Note: This valve body has no engine braking in low gear! |
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| Author: | slantzilla [ Fri Apr 20, 2012 2:30 pm ] |
| Post subject: | |
All manual valve bodies are stamped "Not for street use". No engine braking in low means it is not a low band apply, hence the "Not for street use" warning. It is just an electronic Cheetah. I logged thousands of miles with a Cheetah in my Duster and Valiant. Only thing you have to remember is no standing on it in low after you downshift or coast. Not rocket science.
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| Author: | Bren67Cuda904 [ Sat Apr 21, 2012 10:09 am ] |
| Post subject: | |
"Only thing you have to remember is no standing on it in low after you downshift or coast. " I can never remember what's really happening here. Obviously we're concerned about blowing the sprag up. I've always thought that the combination of the low 1st band apply and rapid tire de-acceleration (tires biting after burnout) was the issue. If there was no low 1st band apply, as with the above mentioned kit, wouldn't the sprag failure scenario be eliminated. |
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| Author: | Joshie225 [ Sat Apr 21, 2012 10:51 am ] |
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Without the low band holding the drum all the reaction force in low is on the sprag. My understanding is that if you're coasting in low without the band applied the drum is turning and will hammer the sprag when you open the throttle. With a burnout it's not the rear drum you're concerned about, but the stator and it's clutch in the torque converter. |
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| Author: | slantzilla [ Sat Apr 21, 2012 4:00 pm ] |
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W/O the low band applied the sprag is the only thing holding the rear drum. If you roll the sprag, the rear drum will be free, and the front drum then spins up to 2X engine speed. That is what goes "BOOM!" . Doing a burnout in low gear w/o a low band apply can roll the sprag if the tires bite on you too. Blowing up the front drum is relatively rare in a 904. The drum is a lot smaller than in a 727. |
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