(Example would be if you have 4:10 gears and you install 35" tires, you would need a 33 Tooth spedometer gear)

 

For the owners of older Jeeps, you may have noticed how far off that speedometer is after you re-geared or installed that lift and bigger tires. Well the fix is easier than you think. Follow the chart below, find the speedometer gear you need and install it. If you have a newer TJ or JK, you will need to do it electroniclly with a Superchips or other programmer.

 

 

 

 

Speedometer Gear Chart
Gear 27" 28" 29" 30" 31" 32" 33" 34" 35" 36" 38" 40" 42" 44"
3:07 31 30 29 28 27 26 25 25 24 23 22 21 20 19
3:55 36 35 34 33 32 31 30 29 28 27 25 24 23 22
3:73 37 36 35 34 33 32 31 30 29 28 26 25 24 23
4:10 41 40 39 38 37 36 35 34 33 32 30 28 26 24
4:56 46 45 44 43 42 40 39 38 37 36 34 32 30 28
4:88 49 48 47 46 44 43 41 40 39 38 36 34 32 30
Jeep ID 101

 

Let's start out with a little refresher on Jeep Identification.

With all the different models, the designation can get confusing. Hope this helps when talking with other Jeepers.

JK-2007-Current

XJ - Regular Cherokee '84 - '01
ZJ - Older Grand Cherokee '93 - '98
WJ - New Grand Cherokee '99+
YJ - Older Wrangler '87 - '95
TJ - New Wrangler '97-'06
MJ - Comanche '86 - '92
DJ - Postal Jeep
CJ-5 - Civilian Jeep 60's- '75
CJ-7 - Civilian Jeep '76 - '86
SJ - Old Wagoneer
KJ - Liberty '02+

 

 

 

 

 

 

 

 

Gear Ratio Chart

Something to consider when installing larger tires.

 

 

 

 

 

 

 

 

 

 

 

 

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Listed are some of the more popular oil filter numbers for Jeeps. This is a guide only and not to replace catalog lookup. The typical Jeep 4.2 and 4.0 engines take 5.5 - 6.0 qts of oil.

 

Model /ENG Purolator AC Delco Motorcraft
CJ / 4.2 L25288 PF46 FL331
YJ / 4.2 L14619 PF970C FL306
YJ / 2.5 L14619 PF970C FL306
YJ / TJ 4.0 L14670 PF13 FL842
JK / 3.8 L10241 PF53 FL793
JK / 3.6 (2012) L36135 N/A N/A
       
       

 

 

 

 

 

 

 

 

 

 

 

 

 

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