Several transmissions were offered in the Ranger over the years. Transmission compatibility is a consideration in this swap. Go through the alphabet and then start double letters (AA,BB.etc) and continue. An example would be to use masking tape and start with the letter ‘A’ and label each wire connector (Male and Female sides) as ‘A’ to re-connect later. When you begin disassembly of the 4.0 remember to label everything you disconnect in a manner so that you can easily reconnect them later. Obtaining a copy of Chiltons Ranger/Explorer/Mountaineer 1991-97 Repair Manual #26688 will give you the layout of the engines wiring, component locations, and vacuum line diagrams. Take photos of the 4.0L engine with all the components still intact for later reference. 1995 and newer models have layout changes that would require extensive adapting. Vehicles earlier than the 1994 model year appear to be the best donors for this job since many of the swapped components replace similar or identical items in the recipient vehicle. Take detailed notes on the location of the ECU, wiring harnesses, air intake, electrical system, fuel line connections, and plumbing for cooling and A/C. Park your Ranger next to a 4.0L Ranger if possible and compare the engine compartments. This will give you an idea of what is involved and is a condensed version of on an article printed in the October 1997 issue of Four Wheeler Magazine. The 4.0-liter engine is an ideal engine swap for 2.9 and smaller Ranger engines since the 4.0-liter is available in the Rangers and Explorers.
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