I've decided to install a diesel into my '91 FJ80 and originally decided to go with a 4bt turbo diesel. I already have a 700r4 trans and the advanced adapter & FJ60 split-case. I'm wanting good mileage hopefully in the 22-25 range on the highway and to be reliable and not cost me a small fortune to complete the swap. I have read that the preferred 6.2L is from a '88-93 Chevy or GMC J-model. I found a 6.2L from a '84 Chevy pickup 20 series for $450 from a wrecking yard. I asked about the miles on it but they do not have that info but they said they did a compression check and is good, so what should be the range? Their description is: 8-379 (6.2L diesel), AT, w/o EGR, Vin "J", Atlas Turbo, Runs Great. Does this sound like a good deal and a good motor? Is this the J-series motor because of the "J" Vin code but it is a '84 so I'm confused. Please shed some light and thoughts about this motor (good or bad) and any other suggestions or advice so I can decide which diesel would give me what I'm looking for. Thanks.