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Plus, if you stuck with the BA 10/5 (assuming the 89 islands had the ba), it probably wouldnt last too long, so yea i'd swap to a 3550 or at least a ax15. But not a bad option. Pick up a parts jeep with the 4.0 and ax15, rebuild/stroke the engine, swap over the entire drivetrain and pull the EFI.
The stock lines that went into the 4.0 high output fuel rail are plug and play for the 5.2 fuel rail. Just do some rerouting along the firewall, plug them in and you are done. The 1991 jeep wrangler already utilizes a high-pressure fuel pump. The fuel pressure is regulated on the fuel rail side of the 4.0 engines.
The 5.2 and 5.9 Magnum engines have the exact same mounting points and locations, since the blocks are the same. What that means is, if you swap in a 5.2 and later on decide you want to bump up to a 5.9, the 5.9 will simply bolt right in to the motor mounts you installed for the 5.2 without any issues.
JTPhoto JK. 8991 posts · Joined 2011. #12 · Oct 27, 2019. For your older 3.8 Wrangler the 3.6 swap is as expensive as the Hemi or LS swap. If you want more power I suggest the 3.8 rebuild with the RIPP Supercharger. Solid combo that will last for years. Sent from my iPhone using Tapatalk.
The 5.3 is a much better swap than a 4.0. It weighs less and makes 30% more power in stock form. I have heard of some saying 25 mpg highway with a 4l60e, but would guess 20 to be more likely. I have managed 18 highway with my magnum swap. That's about 2 mpg better than my old 4.0 ever did.
1213 posts · Joined 2018. #6 · Sep 3, 2020. Also they only changed to the PUG (with the updated VVT) in 2016 in certain models. All 3.6 JKs use the non PUG (Pentastar Upgrade) and it wasn't until 2018 when the JLs were released that they updated the Wrangler engine.
2000+ TJ Wrangler and WJ Grand Cherokee 4.0L engine blocks interchange. XJ/ZJ blocks and 2000+ TJ/WJ blocks do not interchange without significant modifications. (1991 to 1995 YJ and 1997-1999 4.0L TJ Wrangler blocks will interchange in XJ/ZJ and visa-versa). TJ/WJ 4.0L Engine blocks underwent clean sheet design changes effective in the 1999 WJ ...
Transmission Mount, AX15 Rebuild Kit, Proper Pilot Bearing, NP231 Rebuild Kit, Clutch Kit, Master & Slave Cylinder Kit, Ax15 Oil (10W-30), NP231 Transfer Case Fluid (ATF+4), Gaskets & Tube of Gasket Maker. Replacement shift boot, shift knob, as needed. Aftermarket/Upgrade Parts: Rear Driveshaft - Double Cardan Upgrade.
In my opinion, the best motor to upgrade into a Wrangler is a 2014 & newer LT1 (lighter than a stock Jeep straight 6). My second choice would be a LS if money was an issue. My third choice would be an older 350 if money was really tight. Some guys like the old school style of a carbed engine.
Make plan. Step 5. Locate your donor engine/tranny/wiring harness and repeat steps 1-4 with the engine/tranny/wiring harness. Step 6. Figure out how to make the chassis plan mate up to the engine/tranny/wiring harness plan. Step 6. Once you have all of that information you can start to figure out what parts you need.