Well I'm blessed with an awesome rear end: 3.08 / open diff

Stocktires were 235/75R16, I switched to 265/75R16 (31.8") over a year ago, no problems so far, but now planning on some 33".

I will definitly want to regear and found a kit over at summit.
It comes with a tractionlock from Ford Racing, ring/pinion gear set, installation kit and lube for just slightly above $500 which is a nice bang for the buck.

--> http://www.summitracing.com/int/part...0066/overview/

Any opions on that kit? Thank you guys!

 

Personally I would check Randy's Ring and Pinion. I don't know what brand gears are included in the summit kit but I have always used Yukon gears. Also the summit kit does not include axle seals or axle bearing but really need to be replaced on a rebuild. Another bad for the summit kit is they include the wrong gear oil and wrong amount. Ford recommends 75w-140 synthetic and if I recall it takes 2.8 quarts. If you call Randy's and tell them what truck you have and what you want they will sell you just what you need. Good luck

 

So by adding that traction lock, does it basically turn it into a Limited Slip Diff?

 

That kit comes with FRPP gears IIRC. If you want to add limited slip, I'd look into an Eaton TruTrac. It's clutchless so there's no internal parts to have to maintain. Also doesn't require friction modifier. It'll be a little more than that kit, but I found mine to be extremely worth it.

And no, friction modifier helps the clutches in the carrier achieve the friction they need to keep both wheels spinning basically.

 

Also make sure you get the ring that goes on the carrier that spins the sensor in the diff. I just woke up and can't think of the name to save my life but yeah. Get one of those or your abs won't work.

 

yeah, it'll be about twice as much since the tru trac is over $500 itself

 

Not quite twice as much..you're looking at about 700 for parts (carrier, gears and bearing and abs ring). Then dif fluid and some black rtv are the only other things you'd need.

 

Depending on his mileage, where are you finding bearings/seals, etc for under $200.

Depending on his mileage, the more you tear into, the problem you find to replace

 

In Ford's differentials, the friction modifier is used to let the clutches slip so they don't chatter when cornering. Some transmissions do use friction modifiers that enhance friction, but the intent by Ford was to prevent noise and hopping.

Also Promillo, I don't know if you care if the gears are used, but you can go pull the diff and gears out of an Explorer and they will work. I got mine for 50 dollars. A lot of the 95+ Explorers came with 3.73's or 4.10's and LSD. They are also a 31 spline, so it works out great. I haven't installed mine yet, because I need to find a 3.73 for the front....

 

I would also be leary of a kit that doesn't tell you what bearings they are. I personally would only use Timken for pinion and carrier bearings. Here's a kit on Ebay for 78 dollars that comes with the shim kit, bearings, new ring bolts, pinion seal, pinion nut, crush sleeve, and marking compound.

http://www.ebay.com/itm/MASTER-INSTA...xU3PLN&vxp=mtr