i have a 03 f150 fx4 with the rear end whine

im tryin go to get a ring and pinion for it and im not sure what im looking for.

my tag reads : V 919B

L55 975 3A07

i figure its limited slip 3.55 ratio with 9.75" rear end, correct?

i was also told that they have the 8.8 ring gear like the mustang and rangers...

so would any 8.8 3.55 ring and pinion work for my truck??

just confused on what i need to order...

 

Don't automatically assume it's the ring and pinion. It could be a bad axle bearing, pinion bearing or the backlash in the gears could be off. None of these necessarily means you have to replace the ring and pinion. It would be a good idea to take the truck to a shop where they can diagnose it before you start ordering parts you probably don't need. Depending on the problem, it is possible to diagnose it pretty accurately just by the sound it makes, but it will have to be done by somebody with experience and a trained ear.

Not likely. Chances are, the ring gear wouldn't fit on your carrier. Even if it did, the ring and pinion probably wouldn't contact each other correctly (if at all) because they are smaller than what is supposed to be in your truck. Buy exactly what you need and don't try to take any shortcuts.

Call Randy's Ring and Pinion. 1800-347-1188. Give them the tag number off your diff and they'll hook you up with whatever you need. Very good company. Good Luck.

 

this problem was diagnosed at the dealship with a quote of 1300 to replace the ring and pinion.....

it has a whine noise from about 40mph to 50-55 mph then goes away....

if i give it a slight touch on the throttle if whines like crazy, but if i let off it goes away...

 

I still don't think That necessarily means that you need a new ring and pinion. All it REALLY means is that that something isn't set up correctly. My truck does the same thing and it's because when I set up the rearend I didn't put enough preload on the carrier bearings. Buying a minor install kit and having somebody shim out the carrier again may fix the problem.

If you do decide to order parts, I seriously recommend calling Randy's Ring and Pinion. Even if you don't plan on ordering anything from them, they'll still give you excellent advice. They'll even talk you trhough setting up a rearend that you didn't buy from them. Whatever you decide on, I hope it turns out good.