I've located a complete running 2.9 for $200.
But I'm contemplating the famous 4.0 swap.
I haven't found a donor yet so I'm unsure of costs.
I've read all the swap info posted here and have come up with the following.
Please correct me if wrong.
Recipient:
1990 Ranger SC 4x4 2.9 A4LD
Donor:
Unknown
Parts Required 4.0:
1990-1992 Ranger or Explorer 4.0 Engine complete with accessories, ac, ps and alt
Throttle cable and cruise control cable assembly
Air tube with air filter housing, and mass air flow
Under hood wiring harness with distribution box
Computer
Exhaust manifolds, crossover pipe and catalytic converter
Fuel lines, later models with EFI will be the easiest, all that's necessary is the adaption of the quick-connects for the fuel send and return lines in the engine bay
AC lines, air conditioning systems have some configuration changes between 1992 and 1993 models. Pre-1993 models used the same receiver/dryer and evaporator, so obtain an A/C hose setup from a 1992 or earlier engine
Starter
Parts Suggested 4.0:
Transmission
Explorer 4 row radiator
D28 front axle to D35
Under hood emissions tag
Parts Retained 2.9:
Transmission
Motor mounts, the 4.0 mounts require drilling the Pside frame rail
Exhaust Y-pipe and catalytic converter
Maintenance:
Replace engine rear main seal, the rear seal on the 4.0L has always been prone to leakage. It appears that the original factory finish on the seal surface was too slick, so the seal just couldn’t control the oil. Ford offers a repair kit that comes with a sleeve and a seal (p/n F5TZ-6701-A), but it costs about $50 at the dealership. Rebuilders should definitely install a sleeve over the factory seal surface, but there are better alternatives in the aftermarket; Micro Sleeve (800-475-3383) and Classic (800-393-0544) both offer sleeves for the 4.0L cranks
Check pushrods for wear, the pushrods and rockers on the 4.0L tend to show a lot of wear, even on engines with low miles. We suspect that there are two reasons for this problem: (1) The material in the rockers appears to be too soft, so they wear on the tip, and; (2) there’s not enough oil getting to the pushrod socket, so it gets worn out, too
Replace transmission front seal