Billy Ray

That is a cut and paste from the '01 XJ manual.


"Cherokee-Ltd" <nospam@home.com> wrote in message
news:xr2dnaZcMbv4A-nenZ2dnUVZ_tednZ2d@rogers.com...
> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
>>>
>> What year are these ratio's for. I've read the HO's and Renix engines
>> have a different OD ratio's.
>>
>> JoBo
>
> Same as my 92 XJ AW4/242.
> -Brian
>

Billy Ray

That is a cut and paste from the '01 XJ manual.


"Cherokee-Ltd" <nospam@home.com> wrote in message
news:xr2dnaZcMbv4A-nenZ2dnUVZ_tednZ2d@rogers.com...
> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
>>>
>> What year are these ratio's for. I've read the HO's and Renix engines
>> have a different OD ratio's.
>>
>> JoBo
>
> Same as my 92 XJ AW4/242.
> -Brian
>

Steve

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
http://xjeep.dyndns.org

Carl wrote:
> 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

Steve

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
http://xjeep.dyndns.org

Carl wrote:
> 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

Steve

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
http://xjeep.dyndns.org

Carl wrote:
> 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