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easiest way is to drive it briskly on a rainy slippery surface, if you feel one tire skidding and the other one does nothing then its NOT a limited slip differential , but yes if you know the vehicle vin number it can be decoded as well from there , just google vin ident for your make and model you should see a vin# decoder for it
limited slip differentials are so designed that when one axle looses traction the pressure is applied through the side gears to lock up diff so that both wheels have to turn. If it slips in reverse then in will slip going forward . I would be inclined to look for a reverse gear problem in the gear box/ transmission. If it is an auto check for reverse solenoid operation.
It sounds like you are driving in 4wd drive on dry pavement. The front drive axles do not work like the rear differential. When you turn, the outside front wheel must travel farther than the inside wheel, therefore they are traveling through the turn at differentspeeds. If you are on dry pavement, this causes the gears to bind. You don't notice this on slick surfaces because the outside wheel will slip instead of bind up the gears. You should not use 4wd on dry pavement. That's the advantage of push button, or shift on the fly, 4wd. You can shift back to 2wd when you encounter dry pavement. All wheel drive vehicles don't have this problem because they have a limited slip front differential as opposed to a locking differential on 4wd. Hope I didn;t confuse you too much.
Changing the differential is not an easy job especially if you've never done one before. Guessing you are keeping your same ring/pinion.
You have to set the backlash with a dial indicator. The pinion has to be meshed with the ring gear at the proper depth. It's a pretty involved process.
See if there's a 4x4 shop near you. They may be more friendly to your ideas. Mudders swap differentials all the time.
Here's a video -
000 DODGE TRUCKS DURANGO 5.9L 8-cyl Engine Code [Z] Limited Slip Differential, Rear 8.25-9.25 W/ TT......GL-5* All TEMPS......75W-140 Standard Differential, Rear 8.25-9.25 W/ TT......GL-5 All TEMPS......75W-140 Limited Slip Differential, Rear 8.25-9.25 W/O TT......GL-5* All TEMPS......75W-90 Standard Differential, Rear 8.25-9.25 W/O TT......GL-5 All TEMPS......75W-90 Note:Trak-Lok axles require Mopar limited slip additive limited slip additive 04318060 or equivalent Differential, With 7.25 RingGear Rear..........1.4 liters Fill no higher then 3/4 inch below plug hole. Differential, With 8.25 RingGear Rear..........2.1 liters Fill no higher then 1/4 inch below plug hole. Differential, With 9.25 RingGear Rear..........2.3 liters Fill no higher then 5/8 inch below plug hole. Thank you for using fixya and good luck
Limited-Slip Differential Only
With Complete drain and refill, add 4 ounces (118 ml) of Locking
Differential Axle Lubricant Additive, GM P/N 1052358 in Canada use P/N
992694 or equivalent
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.
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