Jeep in question is 91 Cherokee Laredo 4.0 with 4spd automatic and selec-trac trans. I usually run it in 2hi, transmission in the overdrive position (D). Running between 65-70mph, the tach reads 2000-2100rpms. Seems a little low to me. Drop it to 3rd gear, it reads about 3000rpms. Is this consistent with the 4spd auto and 3.55's? I'm concerned I might have
2.something gearing. What are the gear ratios of the AW-4 (I'm guessing I have the AW4) trans?Thanks,
Carl
All the overdrives I've used drop RPM by about a grand.
AUTOMATIC - AW-4
GEAR RATIOS
DESCRIPTION SPECIFICATION
Gear Ratio-First 2.804:1
Gear Ratio-Second 1.531:1
Gear Ratio-Third 1.000:1
Gear Ratio-Fourth 0.753:1
Gear Ratio-Reverse 2.393:1
I don't have the AW4 transmission in my WJ but with 3.55 gears I run 71-72 mph at 2000 rpm in 4th (overdrive).
What year are these ratio's for. I've read the HO's and Renix engines have a different OD ratio's.
JoBo
Perfectly normal. My '99 XJ (command-trac) has identical numbers.
Same as my 92 XJ AW4/242.
-Brian
That is a cut and paste from the '01 XJ manual.
Do the math:
ratio = (rpm * tire_diameter) / (mph * 336)
Assuming your tire diameter is 29" (235/75R15) and you turn 2000 rpm @
65 mph, your final ratio is 2.66. Divide that by your 0.753 OD ratio, and you get 3.53 diff ratio. You have 3.55 gears.Steve
Carl wrote:
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