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-   -   1998 TJ 4 cylinder Gear Ratios? (http://www.wranglerforum.com/f210/1998-tj-4-cylinder-gear-ratios-147021.html)

Decker 03-17-2012 08:48 PM

1998 TJ 4 cylinder Gear Ratios?
 
Hey everybody,
I'm possibly buying a 4cyl 1998 TJ, its a 5 speed manual. I'm planning to lift it 3 inches and install 32's (possibly 33's) as soon as I buy it. I'm wondering if anybody on here could tell me what the gear ratio is?

From what I understand, ALL 2.5L 4cylinder TJ's have stock 4.10s. If the 98 does have 4.10's, lifting it will be fine. If not, I may have to reconsider.

So! Could anybody tell me if all 2.5L Tj's do have stock 4.10s?

Thanks, Max

jeepwayoflife 03-17-2012 08:59 PM

Look on the little metal tab on the rear or front axle covers. It should say on there :wavey:

Decker 03-17-2012 09:07 PM

Thanks, but I haven't bought it yet and forgot to check! In the meantime, do all of them have stock 4.10s?

DevilDogDoc 03-17-2012 09:23 PM

Should be 4.10 unless it was changed but you probably wont like it....

4Jeepn 03-17-2012 09:32 PM

Not sure what your budget is, but if you can look for a 6cly, and one with a rear dana 44 axle..has square metal fill plug in the diff. this will solve two major problems the 4cly has, power and will give you a better rear axle for the bigger tires.

Decker 03-17-2012 09:44 PM

This one is awesome and its a great price. Otherwise i wouldn't bother. Just sold my 99 sport 4.0 automatic

2JeepsThatRun 03-17-2012 09:50 PM

4.11s in all TJ 4 cyl and you want 4.88s for 33s and a 4 cyl/5 spd 4.58 for 4cyl/auto or 4.10s if its a 6 cyl. You need the higher rpms in a 4 cyl to keep up on the highway and still have fifth gear

H3llman 10-09-2012 11:08 PM

does anyone know what the 6 cyl 4 l tj comes standard with? i put 33's with a 3" suspension lift on it over a year ago and haven't really noticed a difference, besides my speedometer being off. But honestly i didn't know anything about gear ratio's and it sounds like i could be flucking up my jeep. it has been driving great and i haven't noticed a difference but if theres something i should know then, well.. HELP!!

JVLemur 10-09-2012 11:19 PM

Quote:

Originally Posted by H3llman
does anyone know what the 6 cyl 4 l tj comes standard with? i put 33's with a 3" suspension lift on it over a year ago and haven't really noticed a difference, besides my speedometer being off. But honestly i didn't know anything about gear ratio's and it sounds like i could be flucking up my jeep. it has been driving great and i haven't noticed a difference but if theres something i should know then, well.. HELP!!

Depends on your axel, could be either 3.07, 3.73 or 4.10.

Wattapunk 10-10-2012 08:10 AM

OP, yours should be 4.10's. Should be fine running 32's, 33's do-able but probably pushing it.

Shoe 10-10-2012 10:34 AM

I looked at a gear chart a while back, and 4th gear with 33's ends up about the same as 5th gear on stock tires. You basically end up with a 4 speed with a fairly high 1st gear. If it's not too hilly where you live it will be ok but not ideal.

Jerry Bransford 10-10-2012 11:07 AM

Quote:

Originally Posted by H3llman (Post 2875830)
does anyone know what the 6 cyl 4 l tj comes standard with? i put 33's with a 3" suspension lift on it over a year ago and haven't really noticed a difference, besides my speedometer being off. But honestly i didn't know anything about gear ratio's and it sounds like i could be flucking up my jeep. it has been driving great and i haven't noticed a difference but if theres something i should know then, well.. HELP!!

If it's not a '97 or Rubicon, it came with either 3.07 or 3.73. Since you're not noticing that much difference with the 33" tires, I'd have to suggest it has 3.73 gears since it'd be a real dog with 33" tires and 3.07 gears. What year TJ and which transmission do you have?

Also as mentioned above, so long as no one removed it, your axles have a steel tag bolted onto the differential covers at their 9 o'clock position which will have your ratio embossed into it. The ratio won't show a decimal point so for example if you have 3.73, it will say "3 73". Depending on which axle you look at, it may show a ratio like 3.74 since the front and rear axle ratios of non-Rubicon Wranglers are .01 off from each other.


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