Which is the Better Gears 4.11 or 4.56?

I have a 1990 MJ with the 4.0 Liter and 5 speed. I have just lifted to 6 inches and mounted 33X12.50s. I have done a lot of research but still get varing opinions. Either 4.11 or 4.56? I would appreciate a little advice and first hand experience.

From the information I have, it appears the 4.11s will put it closest to original RPMs (in 4th and/or 5th). P225SR70 or P205SR70 with 3.55

Some people say it is still gutless on the highway with 4.11!

Secondly, are there better gear manufactures than others? Any brands that is better or some to stay away from?

Any good deals?
:wierd:

I had 4.10's on 33's and didn't like it although mine is an automatic. I just switched to 4.56's. I am definately happier with the lower gearing and it seems to be getting me a little better gas mileage than the 4.10's did because I drive the freeway a lot and it down shifted constantly.

4.10s will be pretty close to stock but you'll end up working harder to keep the heavier tires rolling. 4.56 will work for ya

Do a search, there is a lot of info on this subject

kirby said:

I had 4.10's on 33's and didn't like it although mine is an automatic. I just switched to 4.56's. I am definately happier with the lower gearing and it seems to be getting me a little better gas mileage than the 4.10's did because I drive the freeway a lot and it down shifted constantly.

Click to expand...

Thanks for the feedback!!

What kinda gas mileage??

I have a cracked manifold right now that is cutting my mileage as it is so I only get a little better than 15 mpg but it's said that you can get 3 to 5 more than that but don't expect more than 18 to 20

i have 4.10s and 33s right now with a 5 speed, it's decent, but I wish for a little more on the street, and a LOT more on the trail.

soon it will be 4.88, 35s, AW4 auto

i've got 33s and 4.56s wtih my automatic and sometimes wishing i had gone with 4.88s. no specific reason... but I should have

hands down, go with spicer for the gears- they're the OEM. can't get much better than that

4.88s are nice with 34s.

AJ-MJ said:

I have a 1990 MJ with the 4.0 Liter and 5 speed. I have just lifted to 6 inches and mounted 33X12.50s. I have done a lot of research but still get varing opinions. Either 4.11 or 4.56? I would appreciate a little advice and first hand experience.

From the information I have, it appears the 4.11s will put it closest to original RPMs (in 4th and/or 5th). P225SR70 or P205SR70 with 3.55

Some people say it is still gutless on the highway with 4.11!

Secondly, are there better gear manufactures than others? Any brands that is better or some to stay away from?

Any good deals?
:wierd:

Click to expand...

I know from direct expierence. I have a 5 spd, 33" tires and I have had both 4.10 and 4.88. I didn't mind 4.10 and 33's onroad, it works rather well. RPM's are in a very good place. Highway was fine, if I had to pass it did well in 4th gear. I also had no trouble with hill climbs, I was able to do them all in 4th gear. If I was able to keep the speed up then maybe 5th at times.

I'm now with 4.88's because I wanted a lower ration on the trail. Right now it reminds me of when I had 4.10's and 31's. First gear is rather low, you can start out easily in second. I'm pulling about 2500 rpm's at 65mph. I can pass in 5th with no problem.

I've been told 4.56 is a very good ratio for 33's. I went with 4.88 because I wanted to see a bigger difference. As far as company's, Yukon or Dana. I have a set of Superior's in the rear, compared to the set of Yukon's I have for the front I can see the difference in quality. Stay away from Genuine Gear, otherwise do a search.

Always go lower than you think you want. If you plan on stepping up to say 35's id definatly go 4.88's. I was planing on going with 5.13's originally but im glad i ended up with 5.43's with 38's. I pull about 2500rpms at around 65-70 but i still get 15-20mpg on the highway.
marc