lt85 0r r380 are same size as lt85,length wise and would fit as direct replacement with there appropiate mounts , there are 2 typers of lt85 20c is lr h/d version with oil pump internal and 22c santana std version no oil pump ,but gears are exactly the same apart from ludrication holes,the high low lever housing needs changing as lt 85 has different linkage ,r380 box would fit just as well and 300 tdi can be converted with input shaft and bell housing ,both of which i have kicking about as most are converted other way,def v8 lt77 would also fit the same and are better like r380 with oil cooler on v8s both boxes should have provision for this