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DC Pit Crew Boss
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4,165 Posts
Discussion Starter · #1 ·
So if you're like me and have just changed your rear end gears (i went to 3.73's) then you will have to replace your speedometer drive gear and driven gear in order to have the correct speedometer readings. This job is really not as bad as it may seem and only took a few hours with plenty of breaks and fooling around in between.

First things first, get your vette lifted off the ground and remove the exhaust. I opted to put the rear of the car on ramps and the front on jacks. You only have to remove from the tranny back because this will make access to the tail housing and drive shaft easier.





The next step is to remove the driveshaft. Do this by disconnecting it from the rear end. You will need to remove "4" 8mm bolts and then you can pull it out gently from the transmission. Before you remove it though, be sure to mark the driveshaft and rear end with a line for easier installation. Also, you imight want to tape up or use rubberbands to keep the "spiders" from falling out of the spicer, its a pain to reassemble if you do drop them, so be careful.



Now the driveshaft is out.


Next lets remove the driven gear. (the grey gear in the picture below)



In the picture below you can see the small piece attached to the tail shaft housing that we need to remove. One bolt holds on a retaining clip which you need to remove. After that, you can just wiggle out the piece that holds the driven gear in place. Watch out though, a little tranny fluid will spill out.




This is what we removed. The green gear is what we are changing out, it just slides off.



Now, looking through the hole that the driven gear just came out of, we can see the red drive gear that we need to replace next.



To get to the drive gear, we need to remove the tailshaft housing which is held on by 4 bolts. In order to get to the top passenger side bolt, the C-beam needs to be moved. Remove the two bolts that hold on the C-beam up front and only one bolt that holds it on in the back. This will let you slide it to the side without completely removing it, as you can see to the right of the picture below.



Remove the red drive gear by lightly tapping it with a hammer and chisel to shatter it, just be sure not to lose the clip that holds it on, because you will need it to attach the new gear.




Next, slide on the new drive gear and secure it with the clip. Then thats it! All you need to do now is install everything, which is opposite of how you took it out. Just be sure to lube up the tailshaft and driven gear housing O-rings with tranny fluid before you re-install.



To help find which gear you will need to use with your set-up, refer to this speedo gear calculator. **LINK** Courtesy of member CentralCoaster

Total cost to replace driven and drive gears = $5.50

Now go out there and enjoy your vette!
 

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Premium Member
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341 Posts
changed my gears a month ago, wish you had put this thread up when i had it all out(haha)not takeing it out again.
 

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DC Pit Crew Boss
Joined
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4,165 Posts
Discussion Starter · #6 ·
The new gears are amazing, it's like driving a different car. I think anyone that has done this mod will agree with me that it is the best bang for your buck. 3.73's all the way!
 

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Premium Member
Joined
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341 Posts
I most definately agree with you.when i first bought the car bog stock it went due to its 3.07gearing.after the engine mods it seemed a little slower in acceleration.changed to 3.73s, man what a difference.with the t700 i reckon you could go 4.11s if you dont do a lot of highway driving that is.:thumbsup:
 
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