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Has anyone tried these?
Maxi-Frig
Freeze 12

I converted my SWB over last year. I did replace all the "O" rings and flushed it before changing over. I installed ester oil and 1.7 lbs of R134,(MAC recommends 85% of R12 capacity). It worked great last year with no problems, There was very little increase in pressures and it cooled that SWB very well.
The feedback that i am getting on all the other alternative refrigerents is not good.I know thats a broad statement but it was from what i consider reliable sources. However try it. If it works, let us know.

Over the hill but still climbing.
88 Montero 2.6L auto, manual hubs, cooling fan conversion gps,recurved distributor,LSD Diff.