Gear Ratio for a Dana 30???

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May 25, 2013 | 12:03 PM

majordamagexj

Thread Starter

Newbie

Joined: Feb 2013

Posts: 10

Likes: 0

From: San Diego

Year: 1996

Model: Cherokee

Engine: 4.0L Inline 6 cylinder

Gear Ratio for a Dana 30???

I have a 1988 Cherokee with a high pinon Dana 30 in the front. I am looking into getting a chrysler 8.25 that has a 3.55 gear ratio. Was wondering what my Dana 30 gear ratio is in the front. Its a 4.0L auto tranny. Thanks for the help.!

May 25, 2013 | 12:13 PM

94XjSport94

CF Veteran

Joined: Apr 2011

Posts: 14,553

Likes: 1

From: Carrollton, GA

Year: 1994

Model: Cherokee

Engine: Inline 6 4.0L High Output

Should be 3.55 if you don't have the tow package.

There might still be a tag on the diff cover of your D30.

Grab a 97+ 8.25

May 25, 2013 | 12:25 PM

salad

Herp Derp Jerp

Joined: Nov 2011

Posts: 18,251

Likes: 17

From: Parham, ON

Year: 1999

Model: Cherokee

Engine: 4.0L OBD-II

+1. Since there were a billion ratios in the 80s, a reasonable way to check is:

Jack up the drivers side the front wheel. Seat yourself so you can turn a front tire and see the driveshaft spinning.

Make two marks on the driveshaft, 180 degrees off Make them unique so you can tell them apart.

Slowly turn the tire and watch the driveshaft spin. Using your two marks count how many times the DS turns for one rotation of the tire.

Just over 3 and a half is 3.55:1