Initial fill for new transmission?

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It looks like I'm getting a new 4L60E again for my van. Not from the same shop as last time. This one will be off-the-shelf, with a shift kit and hardened sun shell from a shop that does those things as standard practice. I assume that I can just take them a couple of cases of ATF and they'll use it rather than whatever bulk stuff they have. So what would you use? Mobil 1? Amsoil? SuperTech? j/k about the SuperTech, it's probably what they have in bulk anyway. I wouldn't spend $10 a quart for motor oil, but ATF is going to be in use a lot longer, so I don't mind spending a few bucks.
 
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You will laugh but I was really going to suggest supertech DexVI...it is licensed and when I had a yukon with the 4L60 I put that in there because it was cheap enough I could do a drain and fill every 10k miles if I wanted to. But if you don't want to go that way I would go Amsoil, Mobil 1, Or Redline.
 
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Run the shop dex/merc for 1,000 miles then switch to Maxlife. Maxlife is far superior to any mineral dex/merc or any DexronVI, but you want to wash the break in contaminants out too, so use the shop dex/merc for that.
 
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That transmission isn't particularly choosy when it comes to ATF, however my choice would be any Licensed Dex VI or Merc V to enjoy their longer drain capabilities (once you do a short drain to get rid of initial wear materials).
 
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+2 on letting the shop use their fluid and switching to Maxlife. Always had great results with their transmission fluids.
 
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I would say go with Royal Purple or BG ATF. Either one will do a great job. Then just change it every 30-50k miles and enjoy your new transmission! I wouldn't want the bulk stuff if I didn't have to.
 

Stelth

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Originally Posted By: 901Memphis
Run the shop dex/merc for 1,000 miles then switch to Maxlife. Maxlife is far superior to any mineral dex/merc or any DexronVI, but you want to wash the break in contaminants out too, so use the shop dex/merc for that.
Are you suggesting a flush at 1000 miles to replace all of the fluid, or a pan drop to replace maybe a third of the fluid?
 
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Originally Posted By: Stelth
Originally Posted By: 901Memphis
Run the shop dex/merc for 1,000 miles then switch to Maxlife. Maxlife is far superior to any mineral dex/merc or any DexronVI, but you want to wash the break in contaminants out too, so use the shop dex/merc for that.
Are you suggesting a flush at 1000 miles to replace all of the fluid, or a pan drop to replace maybe a third of the fluid?
Pan drop.
 
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