I have been trying to get around to this conversion on my 40 for sometime. After talking to some people in the club there seems to be a consensus that 33" tires are the tipping point. 33" or smaller go mini. 35" and larger go with a Saginaw. I have read about the 60 PS conversation but don't know if it would be strong enough to handle 35". I have not heard of an 80 PS in a 40 does it / can it work?
"Keep talking. I'll keep analyzing."
"Bad decisions make great stories."
"40's are only to be sold at estate sales." - Uncle Ben
'72 FJ-40 - 33's, F&R Disc Brake Conversation, rear ARB, sliders, Winch.
'96 FZJ-80 - Borla Exhaust, ARB w/ M8000, OME 3" lift, sliders, 305 BFG KM2, 4.88's and ARBs, and usually dog hair.