Gear question

95GTS · 04-18-2001, 10:20 PM

Just a forewarning fellas, the 23 tooth speedo gear is the one to get the speedo closest (though will still be about 5 mph off after 60 mph), BUT it WILL be chewed up (in the GT). It may take a month or two, depending on how much you drive, but the teeth on the 23 tooth speedometer gear DO NOT mesh with the 8 tooth internal drive gear on the GT T45 trans. IF you use speedo and internal drive gears to correct the speedo you need the 21 tooth (red) speedo gear and the 7 tooth internal drive gear. Only problem is there is no 7 tooth internal drive gear made for the GT. Just for the Cobra. The Cobra has different splines in the center of the internal drive gear than the GT has so you can not use the Cobra internal drive gear. I've been thru this already when I had my 3.73s put in and my transmission rebuilt in my 96 GTS, as some of you probably remember. The ONLY way to get the speedo to read correctly is to use a MECHANICAL speedometer compensator. The new 99-up models use the ELECTRONIC speedometer compensator. I had the 21 tooth in my stang because it was the largest one that would fit and mesh with the 8 tooth internal drive gear. Your speedo will still be off, just not as much as with the 18 tooth (yellow) stock speedo gear. It's the best you can do unless you like particles of plastic speedo gear floating in your tranny fluid and constantly replacing the 23 tooth every few months, or just get the mechanical speedo compensator.

With your Cobra, it already has the 7 tooth internal drive gear so with your 4.10s install the 23 tooth speedometer gear. I believe it does mesh with the 7 tooth. If I'm not mistaken 97snakedriver is running this setup and has not had a problem ( I think it's him, anyways).
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1994 Red SVT Lightning #2019

[This message has been edited by 96GTS (edited 04-18-2001).]

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04-18-2001, 10:20 PM	#13
95GTS Git jiggy Join Date: Oct 1999 Location: MO USA Posts: 865	Just a forewarning fellas, the 23 tooth speedo gear is the one to get the speedo closest (though will still be about 5 mph off after 60 mph), BUT it WILL be chewed up (in the GT). It may take a month or two, depending on how much you drive, but the teeth on the 23 tooth speedometer gear DO NOT mesh with the 8 tooth internal drive gear on the GT T45 trans. IF you use speedo and internal drive gears to correct the speedo you need the 21 tooth (red) speedo gear and the 7 tooth internal drive gear. Only problem is there is no 7 tooth internal drive gear made for the GT. Just for the Cobra. The Cobra has different splines in the center of the internal drive gear than the GT has so you can not use the Cobra internal drive gear. I've been thru this already when I had my 3.73s put in and my transmission rebuilt in my 96 GTS, as some of you probably remember. The ONLY way to get the speedo to read correctly is to use a MECHANICAL speedometer compensator. The new 99-up models use the ELECTRONIC speedometer compensator. I had the 21 tooth in my stang because it was the largest one that would fit and mesh with the 8 tooth internal drive gear. Your speedo will still be off, just not as much as with the 18 tooth (yellow) stock speedo gear. It's the best you can do unless you like particles of plastic speedo gear floating in your tranny fluid and constantly replacing the 23 tooth every few months, or just get the mechanical speedo compensator. With your Cobra, it already has the 7 tooth internal drive gear so with your 4.10s install the 23 tooth speedometer gear. I believe it does mesh with the 7 tooth. If I'm not mistaken 97snakedriver is running this setup and has not had a problem ( I think it's him, anyways). ------------------ 1994 Red SVT Lightning #2019 [This message has been edited by 96GTS (edited 04-18-2001).]