Your clutch will suffer because your final drive effective gear ratio went from 4.10 with stock 28" tires to about 3.50 with the new 33" tires, but that's all, your gears will be fine. Your acceleration & crawl ratio will suck & your speedo will be way off, but if you can live with these differences then there's no reason you can't continue to run the 33s. Some diesel and EPA versions of the LUV/Isuzu pickup had stock 3.42 or 3.73 gears, mostly to lower the rpms for increased fuel economy but also to keep the diesel rpms in a better position in the power band at highway speeds. They used the same clutch, tranny & the same strength gears as yours, so they should have a long life as long as they're not abused. As mentioned in another of your posts the 4.56 geared 3rd members from an early Trooper are a bolt-in for your truck & will return your final drive to around 3.90 with the 33s, or close to what it would be with 31s & stock 4.10 gearing.
_________________ '78 Chevy LUV,1.9,4sp,headers,31's,SAS Dana 30,Dana 20,SOA rear w/Aussie Locker, rough body, bought new 12/4/78. '87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch,more to come.
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