Toyota really got it right when it designed the first-generation 4Runner ('84-'89): a rugged chassis and dependable drivetrain components, two doors, four seats, and a removable hardtop. The only thing lacking was the engine. Sure, those older Toyota trucks might run forever, but don't expect to get anywhere too quickly.
Part one of our story (May '06) involved the removal of the original 3.0 V-6 and setting the 3.4 V-6 in its place. This swap is fairly straightforward; the transmission and the motor mounts from the 3.0 are directly compatible with the 3.4. Just the same, there are several details that require attention to make the 3.4 run successfully in its new home. Read along as we wrap up the details and take our new and improved 4Runner out in the dirt.
During the swap, parts and advice from Off Road Solutions (ORS) took center stage. ORS has developed conversion kits that make the 3.4 swap a simple matter of reading comprehension and following detailed directions.So, here's the rest of the swap...
 After getting the engine into...  After getting the engine into position... |  we bolted up the engine mounts...  we bolted up the engine mounts and started the hardware for the bellhousing support brackets. |  The teeth on the 3.0L's starter...  The teeth on the 3.0L's starter won't mesh properly with the 3.4L flywheel, so one of the mounting holes in the 3.4L starter must be enlarged to 7/16 inch to adapt it to the 3.0L bellhousing. |
 It's worth mentioning that...  It's worth mentioning that this high-pressure power-steering hose was cut to the ideal length and indexed perfectly. Halfway through our installation, we really started to appreciate these little details. |  Reattaching all of the various...  Reattaching all of the various vacuum lines, fittings, hoses, and cables was very straightforward. |  We were even able to retain...  We were even able to retain the stock vehicle's cruise control. |