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Very expensive,labor and parts probably over 1000 dollars.............probably better to look for a used one in a relatively low mileage wrecked vehicle. don-ohio (:^)
This is bad, rear end locking up and grinding, i will bet the bearings are shot and so is the ring gear and pinion gear . the cost to rebuild this will be costly and you would need a tech to rebuild it . if the ring depth and pinion depth are not correct then noise will start and wear,
I thing the best bet is to locate a used rear end, and install it. it is not hard to install used differential .
When you remove the cover save tag that is on bolt to cover, you will need this when locating used rear end, also count teeth on ring gear and pinion then divide to get the ratio. there is a good website that will help you locate a used rear end in your area.
When you say "new". Do you mean brand new, or used. I work in a recycling yard, and depending on the ratio (there's a tag on the read differential) it can sell from anywhere between $200 to $400. A brand new rear from what I've been told can go as high as $2000.
Generally you can find that out by showing the ID tag to a parts guy at a dealer. However...after being fooled several times by tags that were not from the original diff I was working on, I use the tried and true method of actually removing the axle and counting the splines. Up-grading to a positraction rear is a good idea but one thing to remember is that you need to re-set all clearances properly or the gears will quickly self destruct. A cheaper and easier swap is to find a complete differential in a scrapyard and install the entire unit (complete) Then, your only concern is that you exactly match the gear ratio of the one you are replacing (again, don't rely on the tag...count the gear teeth on the ring gear and pinion gear.) Posi units are sometimes difficult to locate but if yours isn't broken, you have time to search.
you will probably find damage in the differential. remove cover and inspect.on one of the bolts there should be a metal tag with numbers on it .dont lose. you will need to order gear set.
Rebuilding any differential requires experience and skill as well as the ability to use dial indicators etc. It is one of those jobs that if you need to ask how, you should not be doing it. Even a small mistake can result in the unit self destructing in a very short time. Positraction diffs are a bit difficult to locate, especially when you need to exactly match the ratio of the one in the front, but far easier to install a drum to drum unit than to rebuild what you have. This is by no means an insult...I know many very good techs that either just do a swap on their own vehicles or send their unit out to someone with a very good reputation that does rebuilds.
there should be a tag on rear end to check rear end, there are 4 different seizes for that car. 16 is 3.73 ,17 is 3.31 ,19 3.55 pos track. and 19 3.55 limited slip.
You most likely have the 7.5, as that was the stock rear axle on older rangers. There should be a tag on the differential cover bolt that has the gear ratio and differential size on it.
The mechanic is right, you should fix it before the differential back there either locks up or strips teeth, in either case you will be stranded. Probably your best bet is to check out a used, complete rear end, and install it. One major precaution if you go this way, you must replace yours with the exact same ratio. There should be a tag under one of the cover bolts which will show your ratio. He is also right about rebuilding with new parts, and in addition to cost of parts, is hard to find someone who is qualified to set it up once repairs are made. Rebuilding rear ends requires special training, and many mechanics do not have it.
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