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Old 12-20-2013, 11:53 PM   #1
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3.73 gears 1990 gt

I am picking up my mustang tomorrow. Got 3.73 gears and a bearing kit installed. Is there a certain time frame I should let the gears get "broken in" ? Or should it be good to go when I pick it up?
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Old 12-21-2013, 12:20 AM   #2
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If they were properly installed there should not be any ”break in” period.
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Old 12-21-2013, 01:04 PM   #3
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There shouldn't be a break in process and be prepared for a huge difference.you will be happy with the results
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Old 12-21-2013, 03:17 PM   #4
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I am very happy with the results
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Old 12-21-2013, 03:28 PM   #5
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That will probably be the beginning of a modification process.you may become addicted to mods
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Old 12-21-2013, 03:44 PM   #6
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I am very happy with the results
Sweet! Do you have an AOD or T5?
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Old 12-21-2013, 03:48 PM   #7
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I am very happy with the results
this makes me want 3.73s even more lol
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Old 12-22-2013, 10:47 AM   #8
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AOD
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Old 12-22-2013, 10:59 AM   #9
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AOD
Nice! I swapped out the aod for a t5 in my Fox. I bet those 3.73's really make a difference. If you don't already, I'd look at a higher stall converter too. I've still got the TCI streetfighter converter I had in the car before I swapped for a manual. And it made a difference (and I still had 2.73's)
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Old 12-22-2013, 11:14 AM   #10
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Yes roguestang is on it.I have a 2800 stall and it complements the gears.will put you back in your seat as you launch it.would be a nice addition to the gears
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Old 12-23-2013, 12:00 AM   #11
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4.10's are the best thing i've done to my aod 90. Not correcting the speedo, not so much.
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Old 12-23-2013, 09:59 AM   #12
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4.10's are the best thing i've done to my aod 90. Not correcting the speedo, not so much.
I forget but aren't the drive gears actually part of the output shaft on the AODs or is it still 7 or 8 tooth plastic gear? I know on the manuals its plastic.

Crappy thing about the foxes is its a mechanical speedo so you can't use a speedcal and there is no gear to correct for anything higher than 3.27 with the 8 tooth drive gear and 3.73 with the 7 tooth.
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Old 12-23-2013, 11:10 AM   #13
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Originally Posted by scottydsntknow

I forget but aren't the drive gears actually part of the output shaft on the AODs or is it still 7 or 8 tooth plastic gear? I know on the manuals its plastic.

Crappy thing about the foxes is its a mechanical speedo so you can't use a speedcal and there is no gear to correct for anything higher than 3.27 with the 8 tooth drive gear and 3.73 with the 7 tooth.
Honestly i've never looked into it that hard. I just know 95mph on the speedo is around 72.
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