Let's play guess the gear ratio

trucker_mike

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• Feb 16, 2025

• #1

So I'm trying to figure out my gear ratio

35x12.50 tires about half worn
W5A580 transmission so 0.83 in 5th gear
I'll add the picture of my speed and RPM at 70 MPH..... And go!

 

BLACKJKU

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• Feb 16, 2025

• #2

No guess here unless the gears were swapped.

Thread 'Build Sheet and Window Sticker Generator'

May 23, 2021

If you want a Build Sheet, add the VIN to:
Equipment Listing

if you want a Window Sticker, add the VIN to:
https://www.chrysler.com/hostd/windowsticker/getWindowStickerPdf.do?vin=

(Window sticker seems to be working again on 2013+ models)

• JerryD
• build sheet vin window sticker
• Replies: 14
• Forum: JK Resources

• 

 

trucker_mike

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• Feb 16, 2025

• #3

BLACKJKU said:

No guess here unless the gears were swapped.

[EMBED content="thread-28883"]https://wranglerjkforum.net/threads/build-sheet-and-window-sticker-generator.28883/[/EMBED]

Click to expand...

They definitely had to be swapped. I'm calculating 4:88's

 

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BLACKJKU

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• #4

trucker_mike said:

They definitely had to be swapped. I'm calculating 4:88's

View attachment 128872

Click to expand...

That's what they should be for 35's, maybe even 4.56.

 

trucker_mike

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• #5

BLACKJKU said:

That's what they should be for 35's, maybe even 4.56.

Click to expand...

Yea definitely. I'm just glad the PO actually did the swap! Now that one less thing I gotta do!

 

BLACKJKU

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• #6

My 08 when I bought it had 35's with 3.21 gears, still has the 3.21's just stock tires now.

 

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tJKrider

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• Feb 16, 2025

• #7

trucker_mike said:

So I'm trying to figure out my gear ratio

35x12.50 tires about half worn
W5A580 transmission so 0.83 in 5th gear
I'll add the picture of my speed and RPM at 70 MPH..... And go!

View attachment 128871

Click to expand...

70mph, ~2900rpm, 35" tires. Looks like 5.13s to me:

 

trucker_mike

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• Feb 16, 2025

• #8

tJKrider said:

70mph, ~2900rpm, 35" tires. Looks like 5.13s to me:

View attachment 128875

Click to expand...

Yes I kinda thought the same but once I factored the tires being worn (the speedo is 2 mph off) I put 34" and got 4:88 but you may be right. Definitely could be 5:13. It's going to the shop beginning of March so I'll have them confirm.