Hmm seems like your not doing something right when you say blowing out toyota rear axels.
Me and my buddy spent about a year and a half building his truck from the frame up, started with painted the frame and cage red then body and toy axels black, then came the power OMG gota love the power the v8 has over the 4 banger. TOTALLY WORTH IT ALL! its got a chevy 350 with port and polished heads low too mid cams, pistions were selectfited too each cylinder, that means you measure each pistion and bore each cylinder too the exact pistion size, giveing much more tighter tolerences and lasts much longer, anyway then went too a turbo 350 with shiftkit and installed bigger springs or sprags something like that he did that part dont remember much about it, then runs too duel cases threw advance adapters 350 2 toy adapter then marlins duel case adapter then too the stock axels with 4.38's now was high pinions ft and rear but sold them. we have our own redneck super birfields that havent failed yet and stock rear axels and has 7 inch skyjacker springs up front 2 inch shackles and 3 inch bodylift, with 3 link in the rear with cherokee coils and duel inborded shocks, rideing on 2 inch bs wheels with 38/15.50/15 super swamper sx's.
truck gets wheeled at least 3 weekends a month usally all weekend and only broke 1 rear axle shaft but that was from getting bound up under some rocks that fell around it and wouldent move well hammerded it and bam snapped it and took out the rear hp as well but still wheeled the rest of the day in ft wheel drive.
truck is deff not babyed and works great so i encourage you too finish it it will be well worth the work.
and with the v8 i would drop back too factory 4.10s or 4.38s for strength plus with the v8 its got lots of low end tourqe so you dont need the gears.
Well thats my
goodluck let us know what you decided too do.
adam