Not sure of the blazer's frame and wheelbase but you'll be best to search the blazer & s10 sites also. Choseing the right length trans will simplfy things,2.8 liter mounts,short water pump,different radiator and mounting,trans cross-member holes drilled or fabricated mount,firewall clearance issue(slightly,at top to access trans bolts),etc.,etc. These are 'some' of the areas that you will need to research,if you havn't already.And if the blazer has the 7.5 rear,they 'usually' don't stand up to alot of abuse without $$$ modifications. I am presently in the planning/rebuilding stages of a 85 V8S10.Surf the different sites,there's alot of info.on this but there are some well experienced builders here with this experience also.