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Modifying Full Throttle Upshifts BW M12 |
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DAMX
AMC Apprentice Joined: Nov/13/2017 Location: Silicon Valley Status: Offline Points: 194 |
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Posted: Nov/24/2021 at 10:24pm |
How can the full throttle upshift point be moved up on a Borg Warner M12 when the transmission selection is Drive. Now the transmission is shifting at about 4000 rpm. I'd like 5000 to 5500 rpm if possible.
Regards Dono
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16591 |
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Modulator may or may not be adjustable to a point. The governor will control the WOT upshift.
Personally, Id leave it alone as parts can be difficult to find.. Just manually shift it..and its better if you do manually shift it
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mixed up
AMC Addicted Joined: Jun/16/2015 Location: Monroe mich Status: Offline Points: 2156 |
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X2 on leave it alone those BW do not like to much abuse and yes parts are getting hard to find
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69 amx 290 auto
65 220 290 4spd 80 ford fairmont |
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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About them M11 and M12 trannys... I had a vintage HotRod Mag that had an artical on the 69 AMX. They went through various steps on doing a few strip runs. If anyone has the artical I am talking about, it mentions a spider leg in the carb throat. Ha! Anyway they mentioned the tranny quickly became an issue after a few runs. If you are wanting to keep your times close, pack a lot of ice with you and cool the tranny pan after every run. Heat is a problem with keeping good shifts. Never had one to experience for my self, just the artical has been a bit of knowlege, for my own curiosity.
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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sweatlock
AMC Addicted Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3285 |
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X3 on leave it alone - if you’re wanting it to upshift automatically at redline you should start looking for another tranny. Not because the M11/11B/12 weren’t good transmissions, because for their day they were, but rebuild kits and hard parts are getting very scarce and hence expensive $$$.
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DAMX
AMC Apprentice Joined: Nov/13/2017 Location: Silicon Valley Status: Offline Points: 194 |
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I was afraid thats what the answer would be. I guess manual shifting is the answer.
Unfortunately a transmission swap is difficult because of the small pilot bushing crank in the 68 390. I wonder if a custom torque converter could be made so the crank would need to be modified? Regards Dono
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scott
AMC Addicted Joined: Jul/10/2007 Location: Wildwood Pa. Status: Offline Points: 3498 |
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There is some info about the vacuum modulator adjustment in this thread. Not sure what effect, if any, it would have on the full throttle shift point. |
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"Prolly" is not a word.
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3529 |
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Modulator isn't going to override the governor setting.
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6754 |
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I have an article that states the stock M12 with shift lever if left in 2nd, will shift to 3rd at 5400 RPM regardless.
It also states going to a modern band material with more friction and oil distribution grooves will reduce heat generated substantially. |
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ramblinrev
Moderator Group Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11468 |
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Isn't there a note in the Owner's Manual, that a BW, in the "2" position will automatically upshift to 3rd at 70-something MPH? |
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74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
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