[redshift]

I can attest to the grease problem in the 3906, I have a buddy with a 3905 and we discovered STP Oil Treatment is excellent in the new and old style transmissions, and also in the newer sealed diffs both inside and outside the cup. it only takes about a teaspoonful in the transmissions, it propagates very well and is very tenacious. This stuff is like honey, and will solve with standard degreasers, whereas silicone won't. I overfilled my rans the first time, and I actually thought I was being conservative, but literally a few drops is enough, and it would be good for months easily.

I recently sheared the rollpin in my 3906 2nd gear, while it was apart I tapped the top of the front half of the trans 10-32 for a fill hole, now I can assemble my trans dry and add after it's installed back in the truck.

I highly recommend STP Oil Treatment for these applications, it's thick enough to not seep through the splits in an unsealed trans, and very little is more than adequate to keep everything wet without any worries- guys trust me this stuff is great!