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That's excellent, and normal. Don't worry about it, IMO.

Hurst01, the key to your statement is "...most modern engines", and relative to older engines, an additive or ensuring that the oil selected contains the necessary levels of ZDDP is mandatory if you...

...which is why I swapped the TH350 that came with the project car I picked up for a 700R4, and then bumped the rear gears from 3.00:1 to 3.55:1's. Should have a stump puller 1st but cruise out...

The TH350 is a great tranny, but the great thing with OD is that it allows you to have reduced cruise rpm while still having a more aggressive rear gear ratio for better acceleration in the lower...

Nope, the TH350 and TH400 are both three forward speeds ending with a 1:1 final output ratio. The shift points should be very easy to feel, or simply watch your tach as you move from an initial...

....then with everything "OFF" take a 12V test light, unhook a battery cable and put one test light lead on the cable, the other on the battery post. If it lights you have a current draw in your...

Nope, zinc & zinc/phosphorus are good stuff, focused on high pressure wear zones. Adding Zinc, or running the oil with high zinc is not a problem for any engine, but it's become all but mandatory...

If it's a four speed auto it's either a 700R4/4L60E or a 200 4R. Charlie gave you the pictures for ID.

For the flat tappet engine you'll want some type of strong zinc additive, like ZDDPlus or...