I too want a 3RZ in my 85 Ext Cab. However, I have an R151 from an 86 in the truck now and would like to keep it. From reading the thread (over and over) the only way to make this work is with a Marlin belhousing which is no longer in production or with a 2TR bellhousing?? I read that the 2TR housing is slightly longer and would require milling. If I have to source a 2tr bellhousing, I might as well source a 2TR engine as well.

Im not in dire need of an engine now, I just want to be prepared and this bellhousing issue is not helping out. Any advise?