G2 is their in-house brand.. they push that b/c it carries the best profit margin for them. When I asked my 4WP parts tech which gearing he put in his personal truck, his answer was Yukon.

4WP offered me the same 3/36 to begin with.. when I told them the competing shop was offering lifetime on the entire setup then 4WP matched it for the same price.

Results may vary. In Denver we have a few reputable 4x4 specialist shops so there's a little competition. Some other areas it's either 4WPs, or Joe's garage.. and they know it.

 

I see! We have ORW, 4Wheel Parts, Express performance (a local big shop) and many little shops all in EL Cajon. Not to mention all of San Diego.
and Mika is pushing what is in his truck as his personal experience.
So now I will go to the two specific Drive line shops. and see what they offer.
4 wheel parts was offering the ring and pinion for both frt and rear axles installed at 1700.00 the limited slips were just the additional part cost if done at the same time.

again thanks for your time ... and all you info so helpful!

 

That sounds about right.. you'd be looking at about $550 for the front & rear yukons (4.56s for 9.75 / 8.8 axles), $300 for both master install kits and about $800 total for labor. The Truetrac should run you around $465 and you'll spend another $100 if you go with full synthetic oil such as Royal Purple. All in that'll put you around $2200 plus whatever you spend on extra warranty and tax.

Make sure whatever they quote you includes the Master install kits (not a minor kit) with Timken bearings. This will get you a full set of new differential bearings, gaskets, seals, bolts, etc.

 

Thump, you and Driver 444 have convinced me to go with Detroit true trac diffs front and rear.

are superior axle gear sets any good?

M.I.T. driveline specialties said that for them G2 and Yukon are simular quality and that Superior is a much better gear. Superior is on of the Listed brands on 4WP site. Of couse Mika at 4weel parts said he could get me what ever I wanted.
I am thinking of ordering parts tommorrow.

 

I don't have any first hand experience with Superior. Upgraded axles are always a "good thing", but it really depends on the intended use. The 9.75 rear (assuming that's what you have) is pretty stout and in light off roading I doubt you'd snap an axle. If I was building a dedicated rock crawler (which wouldn't be an F150) where it's going to be doing a lot of power transfer while only having traction on one wheel then I'd definitely upgrade axles.. but in that type of application I would do a lot of other things that don't make for a very good on-road vehicle.

I'm definitely a fan of the Truetrac for the rear diff, but I'd be hesitant about one up front. I think it would severely impact the steering in many on-road conditions (you really don't want your front-end to spool up and two-wheel slide when driving in rain or ice). I'd go with a Truetrac rear and selectable locker such as the Detroit Electrac for the front.

 

my truck is NOT full time 4wheel drive. I think that the Detroit limited slip True trac should work fine in the front. One shop questioned the drivability on the street. so they crawled under my truck and made sure the front was not engaged unless I was in 4x4

I was told that the ring and pinion from superior is much better than G2 or Yukon. However they (MIT) did say That Yukon has gotten better lately. I guess there quality had dropped off. I also red this on line. The guys at M.I.T driveline said with the Superior gear set they guarantee no whine. but with the lower grade ring and pinion like G2. they wouldn't guarantee against gear wine. I wondered if they were just trying to sell their brand. but I have seen online where the superior Ring and pinion set is More expensive. I read that they have a great gear set!

So on the limited Slip I have talked to a couple of different shops.
Driver444 and You Thump Say the Detroit TruTrac, and all the say the same except Mika at 4wp. He is the only one rec. the Auborn.

But on the gears I get thre different suggestions G2...Yukon...Superior?

I deffinetly will use 4:56 gears

my truck ought to be real nice in the sand. I won't need push my truck so hard. It will be easier to keep on top of the sand with keeping the power to the ground.

 

That's a good point. With the IWE design it's won't have any impact in 2wd. I was thinking about when driving on-road in 4x4, which I have to do around here quite a bit during winter due to the icy and snowpacked mountain roads I live on. Since putting the Truetrac in the rear I have to be quite a bit more careful with the throttle on ice as the rear end will swing out way easier than with the old stock LS. If you don't need on-road 4wd much then it shouldn't be an issue.

Again, I can't say much about Superior one way or the other. When I was researching I looked into the G2's but had a number of folks (including the 4WPs techs) that said it's possible I'll get whine. Of the 3 shops I seriously looked at doing the work, all 3 recommended Yukon as the top pick and two of them said they'd "guarantee" no gear whine as long as I follow proper break-in. Mine are perfectly quiet so I have no regrets.

Also, if your 4WPs won't go with the lifetime warranty for the whole setup, then you can still get a lifetime on the ring & pinion if you order them through Randy's Ring & Pinion. During the checkout process, they offer a "no questions asked" lifetime parts warranty option on the Yukon's for 29.99 per axle.

Superior could be better.. for me, when 4WPs would guarantee no whine and offer a lifetime warranty on the entire setup using the Yukon's then the deal was sealed. I followed my break-in process to the letter, did my 500 mile checkup and have it in writing that if anything inside either diff breaks (short of the axles themselves) then it cost me exactly $0 to fix.


OP - Sorry about the complete threadjack.

 

I'm not saying theat the Auburn is Junk. It's better than the stock unit. I AM however saying that the factory trac-lock is junk.

But he's how I look a it... Any time your truck is not traveling in a perfectly straight line, your spider gears are turning, (the larger the speed difference beweent the tries, the faster and more they slip) and hence, the clutches (or cones) in any limited slip are slipping (wearing), Even if you're not spinning just one tire. That's why somebody could buy a brand new limited slip-equipped truck today, drive around the city or town, on nothing but dry roads for 3 years. By the end of that time, the clutches will be significantly worn to the point that their holding power is sacrificed.

Think about it, how often do you look at your steering wheel, and its perfectly straight?? almost never around here.


The truetrac will never have that problem.
Also, the shop is right about this... Our trucks disengage at the hubs. When in 2wd, it makes no difference what differential you have in the front. I have a true trac in the front of my 1996 F350, (the one with the locker in the rear), and can't even tell its there, even if my hubs (manual locking hubs) are locked until I need it.

I've said before, I can't see why the truetrac is standard, or at least a factory option.

 

I wish i found this tread sooner. Haveing 4wp install 4.56 and a eaton limited slip today now wishing i had them do a true trac. But 1900 out the door with 3 year part and laber Warranty.