Question about 1989 Chevrolet Corvette

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How do I change the rear gear ratio in my 1989 Corvette. Will it effect the computer and speedometer

I think it is stock with a 307 and I'm thinking somewhere like a 355 or 373 rear would be the best bang for the buck

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  • Chevrolet Master
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I changed a Ford transmission one time with a different tranny not made for that model and my speedometer was way out so I had to watch my speed on the hi way so not to get a ticket. I really can't answer your question.

Posted on Nov 08, 2014

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Posted on Jan 02, 2017

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2 Answers

What kind of problem wold cause a different gear ratio on a 4x4 truck?


For starters, you have to reprogram the computer or the speedometer will be off.

Jan 19, 2015 | Ford Cars & Trucks

1 Answer

I have a 1990 ford F150 XL. 5.0L and changed the rear end to a 308 from a 355 to help with gas mileage. The motor is new. No real significant change in mileage. Any suggestions


Did you replace the speedometer gear so it reads correct. mileage may not be affected as much as you would think. The ECM is calibtaed for the rear axle ratio.

Nov 17, 2010 | 1990 Ford F150

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1989 s10 blazer rear differential small gears worn, teeth ok.


The gear ratio will be stamped on the outside of the ring gear itself.You will need to change the ring and pinion gear. The side and spider gears should not have to be changed unless there is something wrong with them.Changing a rear end gear set takes a fair bit of knowledge and special tools.Make sure you have what you need before trying it. Good Luck.

Jul 27, 2010 | 1989 Chevrolet S-10 Blazer

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What is the stock gear ratio in a thunderbird with


there are 6 different options but I think yours is 2.73:1

look at the tag to know for sure
2.73 : 1
3.08 : 1
3.27 : 1
3.45 : 1
3.55 : 1
3.73 : 1


Mar 25, 2010 | 1997 Ford Thunderbird LX

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Is there anything I could do to bring my RPM's down when Im driving in hwy. I have a 96 t100 4x4 stick, stock. At 70mph rpm is at 3300. I changed to manual hubs and that helps a little.


The only way to accomplish that is to change the axle gear ratio. Trucks are generally geared for hauling, towing, plowing, etc, so you have more torque and power at lower speeds. If you change the axle ratio,your low end performance will probably suffer (sluggish acceleration at low speed). Basically, your T100 is not designed for 70mph highway driving.

Mar 23, 2010 | 1998 Toyota T100

1 Answer

Need to know what speedometer gear is in a stock 85 caprice


There is no one stock speedo gear in a Chev. It is dependant on the combination of rear end ratio, transmission and tire size. Each car has the potential to be different. Theyare easily interchangeable. There is a small bolt holding a clamp where the speedo cable goes into the trans. Unbolt it and the speedo gear pops right out and slides off the end of the cable. If your speedometer is too slow put a bigger gear on, too fast needs a smaller one. It's trial and error but I think each tooth difference is 5 MPH, it's been awhile. Hope this helps.

Oct 09, 2009 | 1985 Chevrolet Caprice

1 Answer

Whining coming from rearend in a 1992 corvette with a 375 gear. how to fix or stop noise.?


If your gear set is worn, replace the differential with one from a scrapyard.
It is very expensive and an exacting science to set new gears up. if noise is from either carrier side bearing it is possible to replace them but generally if there is debris inside the unit the pinion bearings will be affected as well, requiring re-setting of gears. Depending upon what you ask from your vehicle, this is a good opportunity to change ratios. If you don't need all the bottom end performance, you could opt for a 3.23 ratio. If you are looking for more "off the line" power then go to 4.11's. Don't forget though that anything but the exact match to yours will require a speedometer drive gear change .You cannot stop the noise without making a repair.

Sep 20, 2009 | 1992 Chevrolet Corvette

3 Answers

Bigger tires...


Taller tire have more centrifugal force because they have more mass (weight). A body in motion tends to stay in motion. They also have a larger outer diameter therefore through all the weight to the out side of the tire. requiring more energy to accelerate and more energy to slow down than a smaller tire at the same speeds. This is why I would recommend up graded in your brakes and also lowering your gear ratio( numerically higher) if you are going to larger tires. A lower gear ratio will act as a torque multiplier which will get you moving faster up to speed and also adjust your speedometer to be more accurate.
When you go to larger tires your speedometer will be inaccurate because taller tire have large outer diameter. A taller outer diameter tire will travel farther per revolution than a smaller tire. This cause your engine speed to be lower with taller tires because your vehicles tires are moving slower do to it larger outer diameter.
There your vehicle can be re calibrated through the computer. 4wheel parts offers parts call true speed sensors which also recalibrate your speedometer accurately that is the way i would go. Also maybe up grade to larger master cylinder off a 1 ton Chevy and go with some drill and slotted rotors. You most likely will have better braking with these upgrades than you would stock. keep it safe!

Good luck and have fun.

May 10, 2009 | 1994 Chevrolet K2500

5 Answers

1991 Chevy s10 2.8 5 spd speedometer not working :(


check the fuses, mine did the same thing, I replaced the fuse in the fuse panel and it works great now.. easy fix

Jan 05, 2009 | 1991 Chevrolet S-10

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