Ground straps, Make me angry Options

[emerygt350]

Brand new ground strap, installed clean and brushed on both transmission and body. Completely failed me. Wire brushed the neg to body. Checked the cables and replaced the post to starter cable (it was questionable ). Car still wouldn't turn over. Added a new 6 gauge cable from the negative terminal to the spot where the coil attaches to the tin work, turns over like a new car. Even my gauges are working better. Wth. Could it just be the transmission case itself?

I remember an argument about additional ground straps a couple years ago, but can't find it. Any reason not to just keep my aftermarket ground strap?

[emerygt350]

Interesting, so the same stock place on the body, but to the starter bolt rather than the transmission case? That would imply the case is the issue?

Yeah, the tin doesn't make me comfortable either but it was convenient and apparently a way way better ground than a new strap on the transmission.

I might run a beefy cable from the battery post to the upper starter bolt in the engine compartment.

Not so sure I buy welding bearings and such, do transmission gears weld together because the case is the original ground? Now, using my oil pressure line as a route to ground, I worry about (copper).