Gear ratio

m_w_m · 07-28-2005, 05:37 PM

Im swapping out my read D35 ASAP but i NEED to know my ratio. Its a 2 door inline 6 4.0 1990 Laredo 5 speed standard

Thanks in advance

**Matt Gertsch** · 07-28-2005, 05:39 PM

Check the stickies, but I wanna' say 3.07.

**XJ99** · 07-28-2005, 05:44 PM

Divide the number of teeth on the ring gear into the number of teeth on the pinion.. (example) 13-T pinion 40-T ring = 3.076923

**balloo93** · 07-28-2005, 05:47 PM

Is there no tag on the diff cover? Call the dealer and have them run your vin, that should have the ratio.

Or take the cover off and check the side of the ring gear, the ratio should be stamped on it.

Found this online:
"It may be a a code stamped in the housing that needs to be looked up in your technical service manual.

One sure fire way of determining your ratio is openning up the axle and taking a look. Often the ring is stamped with tooth count, ratio, and build date. Sometimes it isn't stamped, but you can still count the teeth yourself and divide ring teeth by pinion teeth to get the ratio."

m_w_m · 07-28-2005, 05:53 PM

Awesome thanks for the pointers guys. I called my dealer ship and the guy was rushing i think so he said he couldnt do it. Id really rather not pull my diff cover off but if i have to ill do it

Ill check the other options first. I thought all the 5 speeds had 3.07's but i called a wreaker (looking for an 8.25) and he said that not all the 5 speeds were 3.07's

m_w_m · 07-28-2005, 06:10 PM

Thanks I just called the dealship and I have 3.07's

07-28-2005, 05:53 PM	#5
m_w_m Registered User Join Date: May 2005 Location: Nanaimo British Columbia Posts: 367 Profile Gallery Classifieds My Jeeps	Awesome thanks for the pointers guys. I called my dealer ship and the guy was rushing i think so he said he couldnt do it. Id really rather not pull my diff cover off but if i have to ill do it Ill check the other options first. I thought all the 5 speeds had 3.07's but i called a wreaker (looking for an 8.25) and he said that not all the 5 speeds were 3.07's __________________ 1990 2 door red cherokee larado 3.5" rubicon express 6030 31" MT's

07-28-2005, 06:10 PM	#6
m_w_m Registered User Join Date: May 2005 Location: Nanaimo British Columbia Posts: 367 Profile Gallery Classifieds My Jeeps	Thanks I just called the dealship and I have 3.07's __________________ 1990 2 door red cherokee larado 3.5" rubicon express 6030 31" MT's