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Neat video with clear differential cover
#1
The  differentials of our vehicles are often overlooked and underserviced, but they are not immune to this, and NOt inexpensive to rebuild.

There are a lot of extra capacity differential covers out there, intending to both reduce the workload on the gear oil and cool it better, but most of these disregard fluid dynamics, and instead of the gear oil following the ring gear around in a nice circle, the squarebacked  extra capacity covers allow the ring gear to sling oil into this cove like shooting a hose at a wall at a 90 degree angle, instead of nearly parallel with it.

The guy in the link below is basically  setting up videos to ultimately sell a product, but he is collecting data, and not just spoutin theory which I respect, as there is so much theory that in actual use does not hold up, yet is time honored and spouted as gospe and repeated ad nauseam reaching legendary status, and has stories sung from the hills about it.

I find it interesting just how quickly the gear oil gets whipped into a froth.

https://www.youtube.com/watch?time_conti...-yG3D3JBRs

He then has a video with an extra capacity square backed cover too.



He does not share the temperature data he gathers, or at least has not yet.

My opinion is the extra capacity square backed covers are likely doing no harm, but are not giving the purported benefit they say they are.

A drain hole would be nice to have, but I'll be sticking with the stamped steel cover which came wth my 9.25 chrysler differential and use a synthetic gear oil changed at about 35K mile intervals.  BUt if I were worried about differential temperatures, I would sticker it with aluminum heatsinks in true OCD fashion and go from a 75w-90 to a 80w-140.

My chrysler 8 3/8 differential did wear out. badly pitted spider gears.  Likely lube failure related.

 I was quoted 1300$ to rebuild it.  I got a junkyard 9.25 for 500$ but then had to spend nearly 800 having new bearings installed in it.

Anyway I though this Video was interesting and wanted to share.  Perhaps it will remind somene to not ignore thier differential and save them 1200$+ in rebuild costs.
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#2
Wow! This guy is really thorough! Have you been following his videos? How do I know which differential I have? And should I worry if I have an 8 3/8?
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#3
I did finish the Banks diff cover videos.

My take away from it is don't bother with flatback extra capacity bling covers.

The 8 3/8 cover is shaped pretty much round/oval and has 10 bolts.

The 9.25 cover is like a 6 sided stop sign and has 12 bolts .

its also possible you have a Dana Axle and not a chrysler( you hope). The link bellow has pics of the rear covers:

https://venturestruckparts.com/rear-axle...ification/
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#4
I don't remember when I first watched that vid, probably on the HAMB website. Anyway, I know pulling the cover and cleaning/changing fluid was recommended after a few off-roading trips in yr 4x4 when mud bogs and swamps were part of the trail. 
Several years ago I bought a 5 year old ford pickup 4x4. The dealer said that howling sound was from a wheel bearing, no big deal or cost. When we finally got around to pulling the diff cover it was almost dry inside. Pay attention to oil leaks, they do get expensive. In this case the dealer paid but a week later they would have blamed it on me.
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#5
Jeez, under powered TX and under powered Diff. Great. I looked last night after I watched the vids, and pretty sure I have the 8 3/8. Will check to be sure in daylight tomorrow. Should I be changing the fluid in that? Not been done since I had it, pretty sure. Will have to go back through records. And who knows when it might've been done before.
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#6
Cant hurt to change Diff fluid and clean the magnet, the Diff is often ignored and mistreated. It takes about 2.3 quarts of fluid. 75w-90 but one can get gear oil such as 80w-140 which can protect better should the SOB get super hot.

Gear oil is stinky stuff.

Not sure the recommended change interval but many vehicles in junkyards have original gear fluid in them and are not there because the axle failed.
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#7
Given all the issues I've had with this thing, if I ever get out of Dodge again, I'd like to be sure I've done everything I can to be sure it's in good shape. Think 80w-140 is the way to go?
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#8
Thicker gear oil has a stronger film strength. And can protect better when the diff gets super hot. It.is less.likely to leak. It wil reduce mpg slightly due.to more.drag. usually 85w-140 is considered an extreme service gear oil..for.towing a lotmof weight. It might extend the potential life of an old.n worn diff. Or.it might not.

If cost were no object.id get redline.shockproof or.amsoil.severe gear. Likely 75w-90. Or close.to.that viscosity. If my diff howled id use 85w-140.

Ideal gear fluid.for.an open diff. No limited.slip. can be different than for.those with limited.slip. most diffs today are. Lmited.slip and gear oil is.formulated for them. Not.open diffs.from 30.years earlier

Im.not.sure what im going.to buy. I have close.to 35k .on mobil.1 75-w90
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