Help figure gear ratio

Whiteknight · May 11, 2007

Hey guys,

I just need alittle help determining which gear ratio my XJ has.

the 2 tags on the diff covers have the numbers:
-35
and
-1253

what do those tag numbers mean??

Pulled the diff cover off and these numbers apeared on the ring gear
-4 06 93 2

and the ring gear has 39 teeth

I am thinking its a 4.10 ratio but not positive.

Thanks in advance
TJ

rocklandxjer · May 11, 2007

how many teeth does the pinion have? its a RATIO so divide

5-90 · May 11, 2007

4.10 gears were found behind four-cylinder engines, and some trailer tow packages in the early XJ years (AMC, not Chrysler.)

Give with some more info - year, engine, transmission... Also, if you've Dana axles (Dana 30 up front, and if you've got an oval cover and housing in the rear, it's the Dana 35) the ratio should be "in the clear" on your tag - bottom line, left end. It will be 3.07/3.54/3.73/4.10/4.55, most probably.

Skwerly · May 11, 2007

Yea my 35 pretty clearly says "3.55" on the tag. If you aren't sure you can always do the old school "spin the tires and count the revolutions" type thing.

Whiteknight · May 11, 2007

alright its a 93 XJ, 4.0, auto, Dana30 and Chy 8.25.

And dumby me didn't count the pinion teeth

Whiteknight · May 11, 2007

alright i just looked at my front and found that 3.55 is stamped on the bottom line, on the left.

Thanks guys
TJ

5-90 · May 11, 2007

If the front is 3.55, then the rear will be whatever is available that comes closest to 3.55 (probably 3.53 or 3.54 - check gear availability in the aftermarket. I don't have my list to hand.)

It's OK if they're different by a couple of points - usually in favour of (read: higher number) the front axle. That will allow the front axle to "pull" when you need it to in 4WD, and makes it easier to gain and maintain control in slippery stuff...

RyanM · May 11, 2007

rocklandxjer said:
how many teeth does the pinion have? its a RATIO so divide

haha you've never pulled a diff cover off then n

B

Whiteknight · May 12, 2007

5-90 said:
If the front is 3.55, then the rear will be whatever is available that comes closest to 3.55 (probably 3.53 or 3.54 - check gear availability in the aftermarket. I don't have my list to hand.)

It's OK if they're different by a couple of points - usually in favour of (read: higher number) the front axle. That will allow the front axle to "pull" when you need it to in 4WD, and makes it easier to gain and maintain control in slippery stuff...

Yeah i knew that. I was mainly wanting to know the ratio so I know what all i need when i regear to 4.88s.

Again thanks everyone for their help. If I would have not been an idiot I would have just looked on the front cover also:dunce:

Help figure gear ratio

Whiteknight

NAXJA Forum User

rocklandxjer

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5-90

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Skwerly

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Whiteknight

NAXJA Forum User

Whiteknight

NAXJA Forum User

5-90

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RyanM

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Whiteknight

NAXJA Forum User

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