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Old 11-26-2013, 05:46 PM   #1
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Speedo gear

Was looking to install a speedo gear in my 91 because of the 373 gears.it being off doesn't bother me but read an article that said with it being off my car could not be shifting at correct times being it's an aod hurting my performance.i would think it would be shifting at rpm which shouldn't make a difference.anybody heard this before?i haven't messed with trans too much so how hard would it be to replace?
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Old 11-26-2013, 07:37 PM   #2
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It's easy...once u jack up car u can see where Speedo cable goes into tranny...it's 1 bolt and wiggle out the old gear...
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Old 11-26-2013, 08:34 PM   #3
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That doesn't sound bad.thanks for the info
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Old 11-26-2013, 08:38 PM   #4
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Anytime
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Old 11-27-2013, 07:52 PM   #5
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Except he has an 8 tooth drive gear in that 91 AOD so the highest correct ratio he can do with the stock setup is 3.27s. And yes you will be off in your shifts if you don't have it setup right. Got to swap the drive gear from 8 tooth to 7 or 6 tooth to run a higher ratio than 3.27 and if someone mentions the 23 tooth gear I'm going to commit seppuku. The 23 tooth gear is NOT A FORD GEAR and will get chewed up in a Ford trans. Its a Chrysler mesh FYI.
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Old 11-27-2013, 08:35 PM   #6
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I did see that it was 8 tooth and wasn't sure if the drive gear needed to be changed.that will be a ***** to change won't it?
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Old 11-27-2013, 10:22 PM   #7
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Tailshaft will have to come off yes. Only way to properly calibrate the mechanical speedos in pre-94 cars unfortunately. 94-up were all electronic and we get speedcals.
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Old 11-28-2013, 10:39 AM   #8
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I found a 23 teeth gear on lmr.if I use this I shouldn't have to change drive gear should I?
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Old 11-28-2013, 09:12 PM   #9
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Did you seriously not read post #5???
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Old 11-29-2013, 08:56 AM   #10
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Yes I did Scotty knows it all.just messin with ya.goin with 21 tooth because I don't want to change drive gear
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Old 11-29-2013, 09:28 AM   #11
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You'll still be way off, you might as well not even bother.
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Old 11-29-2013, 09:56 AM   #12
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Aren't the drive gear in automatic machines in?the manual are plastic and can be changed.am I wrong?
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Old 11-29-2013, 05:54 PM   #13
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Yes
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