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What is wrong with your diff?
 
I think we need clarification. Are you talking about changing the gear oil, or the entire differential? Your post is not very clear. Fresh gear oil at 75k makes good sense.

Don
 
vrod:
It sounds like you are asking about the oil in the differential. That makes more sense. You can DIY the gear oil easily. There should be an upper and lower access plug on the diff. You'll need a drain pan, 2-3 quarts of a good brand synthetic gear oil, and the associated tools. Is your Durango AWD? If so, I would also do the front diff while you are at it.

How heavy is the TT you are towing, and how often? If you tow heavy and frequent, I would do the trans fluid and filter as well.

Don
 
vrod:
Your Durango does not need the additive. That would only be necessary if it had a clutch type limited slip carrier. If you plan to hang onto it a good while, I would do the trans also. The procedure to service the 8 speed is a bit more complex, but doable. The fluid is pricey, around $25 a quart, and the filter is built into the pan, so that's not cheap either.

Don
 
Discussion starter · #11 ·
I do plan on keeping the DD until it is dead :) I do have the maxcare lifetime warranty so not sure how that plays in if I don't do the differential and it fails will they cover that? same with trans once I get to the recommended change time do I have to do it to have the cover the repair work if it fails??
 
Re the warranty, as long as you follow the guidelines for maintenance in your owner's manual, you should be good. If you do the work yourself, keep the receipts in the event the dealer wants proof you did the service. Some dealers will use anything they can find to deny warranty coverage.

Don
 
I do plan on keeping the DD until it is dead :) I do have the maxcare lifetime warranty so not sure how that plays in if I don't do the differential and it fails will they cover that? same with trans once I get to the recommended change time do I have to do it to have the cover the repair work if it fails??
With the Lifetime Warranty, that will be covered. Just have to pay the deductible if you have one.
 
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