3.73 gears
Thread Starter
Heel & Toe
Joined: Aug 2004
Posts: 15
Likes: 0
3.73 gears
I recently installed 3.73 ring and pinion gears in my 81 and am wondering if anyone knows where i can find a speedo gear that will read close to normal. now it says im going about 25% faster than actual.
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
I got a few from Zip products for my Muncie a few years ago. I just looked and they have them for automatics also. Just call them with your application and they should be able to get you the right gear.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Originally Posted by Van Steel
Local dealership should have them too. They are about $5
Need a patient parts counter guy, but they have the info. 3.7 ratio was an option in earlier cars.
Cruising
Joined: Mar 2005
Posts: 14
Likes: 0
Speedo gears
I did the same thing, I put the 15 tooth drive gear and 41 tooth driven gear with 255/60/15 27.1" OD tires in a 700R4 tranny, its pretty good on speed. I got mine over the net from Bowtie Overdrives. You can go to chevytalk.com and find a program that will calculate your gear needs. Good Luck!
Safety Car
Joined: Jun 2002
Posts: 4,135
Likes: 1
when i was running the th 400 and the 373 gears my speedo was off, the way i corrected it was,,had my friend in his 95 drive along side me on the highway, we had push to talk nextels (from work)-he held his vette at steady 60 mph,, mine was off 5-7mph... each tooth( of the gear that you need to change on the side of the trans) is about 3 -4 mph ,,i got a new plastic gear from the general 2 teeth different and it worked,,we ran down the highway again and they we as close as we were gonna get it------when i changed the trans to the 700r-4 ,,i told the trans shop that i had 373 rear gears,,and they set up the speedo gear in the trans correctly
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