Novak Conversions Jeep Wrangler TJ engine mounts

Speedo 8-9 mph off

J

JoeV21

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Feb 18, 2026
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Connecticut
I'm new to the Jeep community and this Forum. I bought this 97 wrangler sport with the 3 speed auto in it.... I know gross an auto.

My main concern is my ODO and Speedo is off, it's about a 8-9mph difference. My my Speedo says 60 I'm really going 68-69. I have already installed a 31 tooth Speedo gear bc there is BFG 32x11.5 on my jeep. Should I jump to instal a 34 tooth? The VSS is clocked in the correct positon for my 31 short gear

Any other advice would be greatly appreciated
 
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Is this the chart you're going off of?

Screen Shot 2017-03-29 at 8.59.22 AM.jpg
 
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TheBoogieman said:
Do you have stock 3.07, 3.55, or 3.73 gears?
Click to expand...

TheBoogieman said:
Do you have stock 3.07, 3.55, or 3.73 gears?
Click to expand...

That's the thing I don’t know, I try to run the VIN build sheet but it's confusing for me lol. I thought I had 3.07 so I put in a 30 tooth, didn't do anything, threw in a 31 tooth to see maybe I had a 3.55 but it's still way off. I know I can count the drive shaft rotations. But I'm being lazy. But that's probably the smart option
 
JoeV21 said:
That's the thing I don’t know, I try to run the VIN build sheet but it's confusing for me lol. I thought I had 3.07 so I put in a 30 tooth, didn't do anything, threw in a 31 tooth to see maybe I had a 3.55 but it's still way off. I know I can count the drive shaft rotations. But I'm being lazy. But that's probably the smart option
Click to expand...

There should be a tag on the rear diff stating the gear ratio.
gear tag3.jpg
 
Novak Conversions Jeep Wrangler TJ engine mounts
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