I'm rebuilding a spare 4L60E with all the "goodies" and wanted the case to look nice. My local trans shop had a cleaning machine which got all the grease off, but it still didn't look that good.
Therefore I had it glass bead blasted today for $50. (I completely sealed it with wooden pieces front and back, put the pan on with a gasket, bolts through all the threads, plugs in the oil and other ports, etc.)
The bead blasting shop offered to powercoat and clear coat it for an additional $150, but that seems like overkill. They said I should seal it with something very soon or even fingerprints will tarnish it.

What would you recommend? What does the factory do?
I don't want anything more complex than a rattle can, although I
could bake it in an oven. I'm think a clear sealant or a silver header or
caliper paint. Ideas?
Thank you.

 

Just clearcoat but degrease it first

 

Do you have a suggestion for a rattle can clearcoat that can take the heat?

 

any clear will do, the trans SHOULDNT get hot enough to hurt anything but VHT makes an engine enamel clear i believe...

 

I don't have a good "before" picture, just this: (and this is after the trans shop ran it through their cleaning machine)



This is what it looks like after glass-bead blasting:



And finally after applying a Clear Engine Enamel:



In case anyone in SE Michigan (Detroit area) is interested, the blasting was done by Michigan Sandblasting in Redford:
http://www.michigansandblasting.com/

After spending $700+ on 5-gear planetaries, new valve body and other goodies, I wanted it to look good too.