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Old 04-29-2015, 08:36 PM   #1
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question on speedo gears

I am a little confused on speedometer correction for a 97 GT. The car has a T45 trans. Everything I read is in relation to the T5 trans internal trans drive gear. Will the T5 6 or 7 tooth internal drive gear work on a T45? If so is there a preference? The car currently has 3.27 rears and we will be changing to 3.73 rear gears. I have been told by a few people to not use the 23 tooth speedo gear because they don't last. I would like to order the 7 tooth (or preferably the 6 tooth gear) and the appropriate speedo gear to correct before having to use a speed cal device.
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Old 04-29-2015, 09:29 PM   #2
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You have an 8 tooth gear. You have to pull the entire tailshaft housing off the trans to change the internal drive gear.


Just get a speedcal. There is literally zero reason to be messing with the speedo gear in a 94+ car as the speedos are electronic.
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Old 04-29-2015, 10:32 PM   #3
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Except that the speedo gear is $16 and the trans is getting rebuilt anyway. seems to make sense to just get the proper gearset and not worry about installing the speed cal. Am I crazy?
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Old 04-29-2015, 10:40 PM   #4
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It won't ever really be accurate until you get the speedcal. On the 99+ cars I think anyway a tuner can fix it. I switched to 410s and changed to the 23 tooth gear, and my speedo is still pretty far off. I don't drive it that much so it doesn't bother me much but I will eventually get a Dallas speedcal to fix it.

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Old 04-29-2015, 10:47 PM   #5
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No, if he's got the trans apart at the builder he can probably save $$$ getting the internal gear done, I missed that part. There are numerous speedo gear charts out there. For 3.73s, you can use a 7 tooth drive gear and a red 21 tooth Ford gear or a 6 tooth drive gear and an 18 tooth yellow Ford gear.


6 tooth is best as you can go all the way up to 4.30s with a simple speedo gear swap and I don't see anyone ever going below 3.27s except road racers. A 7 tooth can only go to 3.73s and I'd personally suggest 4.10s over 3.73s.


3.73s are kind of a bastard gear that everyone likes (me included for a long time). Don't accelerate as fast as 4.10s and its not like there is some massive difference on the highway. NA 2V cars need all the bottom end they can get, even built ones. Don't fear the gear.


http://www.ddperformance.com/content...peedoChart.pdf


Note the blurb about the 23 tooth gear on the bottom. Experienced this firsthand on my first mustang that had 3.73s in a T-5. Speedo stopped working, pulled the gear and it was just nubs. This was after 6 months.




Cliff's notes:


If Zak has it apart, get the 6 tooth gear installed while he is at it.
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