planman

With most 33s and an 07-11 automatic, at 70 mph, you'd turn 2476 rpm with 4.88s and 2603 rpm with 5.13s.

If your rig will be heavy, if you live in a windy, hilly or mountainous area, if you might ever run 35s, the 5.13s would be the better choice. An extra 127 rpm at 70 mph will give you a little extra horsepower without a noticeable loss in fuel economy.

If you live and drive at sea level, if your rig is light, and if you will never go larger than 33s, 4.88s would suffice.

4.56s wouldn't make any sense. The cost more than 4.88s and your performance on and off road would be worse with 4.56s than with 4.87s or 5.13s.

planman

Just realized you live in Bahrain--an island 11 miles wide and 34 miles long at sea level in the Middle East.

I'd definitely suggest do the 5.13s. You aren't going to be driving 80-90 mph very often, and the 5.13s will give you better sand wheeling performance.

yousif

Every year be is tilling me 4.88 I think I will go for 4.88 but I need some one ho installed them till me about the performance on the highway is the rpm high

yousif

Thnx a lot for ur help but I travell a lot by by car every week I leave my country to travel so much in this case what will be better for me
4.88 or 5.13
Last week end I was at #ksa desert it was good in the sand but if I wona go up the hills on the sand can't so now what will be better

planman

How fast do you regularly drive?

At 145 kph (90 mph) 4.88s run 3182 rpm and 5.13s run 3345 rpm.

If you regularly drive 145 kph, I think you will want the extra 163 rpm from the 5.13s for the extra power.

In the sand, the 5.13s will definitely be better.

yousif

So it will not make a lot off diffrent for the rpm in highway sometimes I drive 160 kmh but if there is no difference between them a lot ibwill go for 5.13

planman

That is very fast for a jeep.

5.13s won't result in very much higher rpms--181 higher than 4.88s at 160 kph (99 mph).

yousif

Thnx alot I will go for the 5.13 for better performance my next order will be the 5.13just to be sure for my model the rear axle Dana 40 the front Dana 30

planman

44 rear and 30 front.

yousif

Thnx a lot for ur help