Excellent tutorial! I am currently soaking a like frozen transmission from my '64 Riviera. It only has 2 gear traIns, but the components are virtually identical.
That would have been a good video but mine were very well preserved, but I have restored seat tracks in the past to a Trans Am I did not pull them apart I simply soaked them in evapo-rust until the rust was gone, they came out perfect and brand new then I put some grease in the bearings, just put the seat back together they still work perfect. In fact I just got a 1964 buick wildcat rat rod I will do a video of it's seats in the not to distant future...thoms