4l80e vs 4l85e
#2
http://en.wikipedia.org/wiki/GM_4L80-E_transmission
I'd guess the same as 60 vs 65. 4 planetary vs 5 planetary
I'd guess the same as 60 vs 65. 4 planetary vs 5 planetary
#5
#7
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#10
... and the 80E'a 4 pinion planets should be plenty strong. parish ran an 80E... I think past 1000rw... so should be plenty, eh? But, if you can get an 85E on the cheap... go for it! I think I remember talking to Vince about this awhile back. I didn't even bother trying to price out the (3) 85E's planets. I did get a 300M input shaft though 
Bill

Bill






So thats would be a yep 5 pin planets