I'm in the process of deciding which gear ratio to go with but I'm more concerned with finding the "best" gear. I've found Precision, Genuine, OX and Yukon.

Who makes the strongest set and has the best reputation. Also, I'm upgrading my LS unit while they've got it apart and considering a Detroit True-trac or the Auburn unit. Any thoughts/experiences.

For those who have switched to 4.10's or 4.56's, what set-up are you running and have you had any problems with them?

Thanks in advance

 

Both of those differentials are good, I had an Auburn pro in my 8.8 rearend was putting around 400 HP through it and whaled the crap out of it, worked flawlessly.


Jason.

 

This might help out some

Gear Ratio Guide

 

I put 4.10 gears in mine. Im currently running 31" tires. At 65mph, I run at almost exactly 2000 RPM.

They are ford gears. You wont find any part #s for 2004+ 9.75" gear sets, but they're out there. Any gear shop can get em. I think its the same ring and pinion in the previous year(s) 9.75".

I personally dont have any experience in other gear sets, but from what I have heard, Ford parts are easier to set pinion depth and backlash on and will most likely stay quiet longer. Mine are *pretty* quiet. You can hear them if you reallly listen for them. Ford Gear set 9.75" cost me $340 + install.
Much better acceleration and *hardly* any loss in MPG.

EDIT: Looking in your gallery, I notice you have a 3.73 gear set already. Why would you want to upgrade? Personally, I wouldnt think it would be worth it to up grade to 4.10's from 3.73.
Maybe 4.56 would be better for you, especially if you ever planned on running a bigger tire.

 

I have Yukon 4.56's and have had no problems with them at all. I run 33" tires and about 2050 rpm at 60 mph. solid 14.7 mpg

 

When I ordered my 4.56 rear I used the same chart. According to the mechanics I have met, if you want a real kick in the pants and are willing to drive kindly at sane speeds on the highways, the 4.56 is the way to go. According to the chart, it does not seemed too overgeared. Just a bit. I will be getting mine installed in the next couple of weeks

Just as a frame of reference, the Dodge SRT-10 Quad cab is equiped from the factory with a 4.56.

The only problem you may encounter is vibration. It seems that a few people have had problems with this after switching to bigger gears. I will just have to keep my fingers crossed.

 

If you going to do gears, go all out. DO NOT just uprade to the next avail set, you wont even notice a difference. 4.30 or 4.56 in this case.

 

Hit it right on the head! If you are going for more power/performance then losing 1.5mpg to go to a 4.56 ratio is nothing in terms of the amount of performance gain. If your going to spend the money go all the way.

If you have a driveline vibe now over 2000 rpm's then a gear change will not change that. if you dont have a vibe now then I doubt you will develope one.

 

i have done many RP changes on many vehicles, the precision sets are nice come with new bearings in the kit with shims, the others you mentioned dont, genuin are the best cost wise and the are well made, i would go with a detriot trutrac IMO, i cant recomend a gearset unless i know what engine and tire size you have

 

what is the stock tire size for the 17's?

 

31.5" i believe


I am running 35"s as well right now and want to re-gear. Im thinking of 4.56's. What brand of gear should i go with? And what do i need? Just the gearset? or do i need master install kits and such? I have a 4x4 with the 9.75 rear end and 8.8reversecut front end. My truck has 7000 miles on it if that maters for bearings and such.

Thanks,

 

So by this guide I can jump to 4.30's and still fall into the best over all performance and daily driver. Because if thats the case I am in there like swim wear

 

yea i would be too.. But the problem is no one makes 4.30's for our trucks..

 

They do for noname's truck. All 4.6L trucks have the 8.8 rear. 4.56s for me!

 

Your are living the Thug Life my friend