Under the diff cover

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Under the diff cover

Post by impalamonte on Mon Oct 08, 2018 2:42 pm

Hmmm....never thought so much about this...

https://www.youtube.com/watch?v=9-yG3D3JBRs
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Re: Under the diff cover

Post by Joe73 on Mon Oct 08, 2018 3:28 pm

I've been watching those.  Real good info!!! Love stuff like this.

Heres the other one.  https://www.youtube.com/watch?v=0PMvVcsU3PE
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Re: Under the diff cover

Post by thatfnthing on Tue Oct 09, 2018 10:00 am

That was very interesting. I have often seen aftermarket diff cover manufacturers tout how their cover 'strengthens' the diff structurally, but don't recall ever seeing them once claim to properly route the oil flow.
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Re: Under the diff cover

Post by Joe73 on Tue Oct 09, 2018 10:12 am

I also found it very interesting. I've run those extended covers on several of my 1/2 ton trucks. But it makes sense to me (like shown in the video) that the ring gear throws the oil against the cover, then the oil has to climb the vertical surface, make a 90 degree turn to get back into the diff.

But the main issue for me was getting proper oiling to BOTH of the pinion bearings and out to the axle bearings. And it was also interesting about the amount of aeration the oil was subjected to.

I went so far as to take another look at my TA Performance Girdle I put on my chevelle. It is rounded inside just like stock. I appears to me that the girdle cover gains its benefits by being aluminum, being thicker material on the outside of the cover and its designed strength with the raised center supporting the preload bolts. I'm happy that the cover retains the stock curvature internally.
I think Banks did a great, well thought out job with cutting covers open, installing clear plastic and even lighting to identify exactly what was going on inside there.
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Re: Under the diff cover

Post by thatfnthing on Tue Oct 09, 2018 11:53 am

Two things became obvious to me watching these:

1. The OEM designers really deserve more credit. They've already been down this and many other similar roads and have to consider esoteric stuff like this in all their designs, and you never hear about it. Things that don't even occur to anyone else -- not aftermarket performance equipment manufacturers and certainly not John Q. Public. Then they have to listen to people bitch about how 'bad' the factory design is, knowing how little their critics actually know about how a given thing actually works. Yeah, they screw up sometimes, but nobody reports on houses that don't burn -- you rarely hear praise for the thought and effort that went into millions of drivetrains that go 100k miles or more with minimal maintenance. It really is kind of a thankless job.

2. Gale Banks should have a network TV show. His stuff is totally engrossing. He can make a bland subject like rear diff fluid dynamics interesting as hell. He knows his subject inside and out, and is earnestly curious about how (or how well) things work. He digs deep into the subject and teaches you along the way. A ten-minute Banks video is worth more than all those guitar-laden montage shows on the Paramount network or Velocity combined.
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Re: Under the diff cover

Post by Joe73 on Tue Oct 09, 2018 11:57 am

I agree !!! Well written !!!
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