Differential Case

Originally Posted by Scrrem

Wow Craig....looks awsome!!! Can't wait to see the case. In hind sight, I wish I had hit mine with some paint too, but it came out OK.
Rich

Thanks Rich. I'm sure you did the right thing by keeping it original looking and yours came out nice from your pics. We'll see how this POR-15 holds up in the long run.

[Scrrem]

Originally Posted by Dynomite

I am assuming that your 90' case (is it a 90'?) does not have an oil drain plug. If not, did you install an oil drain plug since you have it all apart?

I am actually thinking of installing an oil drain plug (drill and tap) without taking it all apart

My thinking is......any debris in the differential settled in the bottom of case is very hard to suck out by conventional means and any aluminum shavings (very little if I do it correctly) will all drain out including the other debris when I get the new threaded drain hole installed

And...if I screw it up....that will be a great reason to go to 4.10s

I used that tap kit when I did mine back in November. I was going to pull the axle to install 4.10's anyway, but I wanted to see if any shaving were left in the case. I taped the case and let the oil drain, then pulled the axle out and popped the cover. Couldn't find any shaving inside, so I would feel pretty confident using that kit.
Rich

[Dynomite]

Originally Posted by Scrrem

I used that tap kit when I did mine back in November. I was going to pull the axle to install 4.10's anyway, but I wanted to see if any shaving were left in the case. I taped the case and let the oil drain, then pulled the axle out and popped the cover. Couldn't find any shaving inside, so I would feel pretty confident using that kit.
Rich

Thanks for that information.....what size plug did you install?
Did you tap into the differential case just South of the lower center bolt on the flange?

That would be just below the ring gear I think? (Vet facing west)

[Scrrem]

Originally Posted by Dynomite

Thanks for that information.....what size plug did you install?
Did you tap into the differential case just South of the lower center bolt on the flange?

That would be just below the ring gear I think? (Vet facing west)

I am not sure of the tape size, bought the kit below from Corvette Central:
http://www.parts123.com/parts123/yb....Z5Z5Z50000050F

The kit provides a template that puts the hole just left of the center bolt in the valley of the differential. See pic:

[Dynomite]

Originally Posted by Scrrem

I am not sure of the tape size, bought the kit below from Corvette Central:
http://www.parts123.com/parts123/yb....Z5Z5Z50000050F

The kit provides a template that puts the hole just left of the center bolt in the valley of the differential. See pic:

I placed the Differential Drain Plug just on the Drivers Side of what I call the Molding Seam in the Center of the Flange Thickness of the Differential.

See Item #4 LT5 Added Systems
Post 147 - LT5 Added Systems



Differential Drain Plug Kit

[Racinfan83]

I'm doing this drain plug. I got a new 1/8 x 27 npt tap off eBay for like $5. Had the 11/32 drill bit already. Got 2 1/8 plugs for $5 on eBay. So whole deal is waaay less then that kit....

[RussMcB]

One nice part of the kit is the tap has a stop welded to it. Not a necessity, but helpful. It also comes with a template to help determine the hole placement.

I plan to buy a bunch of extra 1/8-27 plugs then sell my kit (with spare plugs) to someone, who can use it then sell to the next person, etc.