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4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

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Old 07-09-2009, 11:14 AM   #1
stangalator
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Default t45 drive gear swap

So i recently had 4.1's installed, after my speedo was 50% fast! I chaged the speedo gear to a 23 tooth gear and i calcuated it to ~17.5% too fast... I'm not sadisfied i guess. I've been searching about and researching a drive gear swap and it doesn't look that hard, however my question is about the drive gear itself. I can't seem to find a site that sells a 6 tooth drive gear for a t45, only a t5. The sites say that its ONLY for the t5, so i'm guessing they are different gears. I can find a 20 tooth speedo gear fine but i can't find the 6 tooth drive gear, can someone help?

Here is some of my findings and figures i've done in case someone else finds this thread:
23 tooth speedo gear is not a ford part and doesn't go together perfectly, this causes a short life for the plastic gear. Since I'm changing the drive gear, i figured I'd do it right and get a combo that using a ford speedo gear and is closer to my orginal ratio by about half


18/8 oem is 2.25 ratio drive gears (2.73's) then final drive divided by ratio......1.2133333333

23/8 now is 2.875 ratio (with 4.10s).....................1.4260869 fast by...17.5346346 percent


options:

20/6 is 3.333............................................. ....1.23 fast by 1.373626 percent

23/7 is 3.2857142857...................................... 1.2478260869 fast by 2.8428 percent

"perfect" is 3.37912 speedo/drive gear ratio (for 4.10's)

here is a thread that helps out alot in removing the drive gear, thanks Popeye54k
http://allfordmustangs.com/forums/4-...haft-swap.html
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Race car driving is alot like sex, every guy thinks hes good at it.

http://www.newyorkmustangs.com/forum...95-t22305.html
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Old 07-09-2009, 12:04 PM   #2
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I wish I knew more to help you out but if I remember correctly there isn't a gear that's going to be perfect and it will always be off a little. (I'm not 100%)
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Old 07-09-2009, 02:05 PM   #3
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Default

Quote:
Originally Posted by sxynerd View Post
I wish I knew more to help you out but if I remember correctly there isn't a gear that's going to be perfect and it will always be off a little. (I'm not 100%)
Hey sxynerd, what did you end up doing to fix your speedometer when you did your gears?

i ended up going to ford to get the 6 tooth drive gear, part #: E3ZZ*17285*B
I still need to order a 20 tooth speedo gear, I guess i can live with 1.37% too fast.
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http://www.newyorkmustangs.com/forum...95-t22305.html
^INSTALLED: FULL TILT BOOGIE IRS ^
306.x/298.x
13.41@104.76 (pre-cams and tune)
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Old 07-09-2009, 02:05 PM
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45, 46, changing, drive, final, gear, gears, mustang, sn95, speedo, speedometer, swap, t45, t5, tooth

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