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Unread 06-22-2010, 07:10 AM   #1
thierryben
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what is the stock ratio on my YJ 1993

Hi , I have an YJ 4L 1993 with manual transmission ,

I have 4 tyres in 35" and for the time I have the stock axles , , I want to change my ratio for a 4.55 or a 4.88 but I must find the original ratio ,

please someone can help me , what is the original stock ratio on my axles ?

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Unread 06-22-2010, 07:18 AM   #2
sloan74
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4.10

go to 4.88, same price and better.
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Unread 06-22-2010, 08:35 AM   #3
WRMJeep
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My '93 4.0L with manual trans was a 3.07 ratio. Depends on the jeeps package and options what the gear ratio is. Jack up rear pumpkin and turn the driveshaft and count tire rotations, or try to read the label on the diff. There are previous threads that talk about the procedures for each.
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Unread 06-22-2010, 08:52 AM   #4
UltimatE
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a 4.0L with manual transmission is 99% of the time 3.07's.
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Unread 06-22-2010, 09:03 AM   #5
thierryben
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ok , many thanks for your answers , and if I choose a ratio of 4.88 , do you think that I can change only my ring and pinion or I must change my carrier and my posi too ?
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Unread 06-22-2010, 09:04 AM   #6
sloan74
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crap i misread and was thinking 2.5l

sorry!

yeah should tell you on the differential covers, one of the bolts will have a metal tag attached, if you can spot the tag, clean it so u can read it, and it should tell you the ratio.
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Unread 06-22-2010, 09:08 AM   #7
MJMPC
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From the FAQ


Gearing

I4 Automatic - 3.73:1
I4 Standard - 4.10:1
I6 Automatic - 3.54:1 (normally)
I6 Standard - 3.07:1, 3.54:1 or 3.73:1 - must verify with the tag on the axle or by pulling the differential cover and reading the numbers stamped in the ring gear or by counting revolutions of wheel versus driveshaft.
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Unread 06-22-2010, 09:10 AM   #8
grnsanddemon
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If you have 3.07's then you will have to change the carrier. I think the carrier break is 3.73's. If you have 4.10's then the carrier should work.
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