Eagle Posted October 20, 2019 Share Posted October 20, 2019 A friend of mine has a 2.5L TJ. His stepson has a 4.0L TJ with a frame that's too far gone to drive. They want to swap the 4.0L engine into the Jeep with the solid frame. Does anyone know what's the deal on motor mounts? I found a parts manual for the YJ and, to my surprise, they actually had two different frames. Is the TJ the same thing, or can the motor mount issue be dealt with like in the XJ and MJ, with bolt-on parts? Link to comment Share on other sites More sharing options...
thecodemonk Posted October 21, 2019 Share Posted October 21, 2019 A quick google around pirate and other jeep forums seem to indicate that it should drop in, no problem. (XJ blocks are apaprently not compatible with TJ mounts and vice versa, but since you're going from TJ to TJ, it should fit). Since you have both vehicles, it probably wouldn't hurt to measure the mount locations on each jeep to verify (from the front of the frame). The YJ is a weird beast with a lot of crossovers to the CJ, so that may just be more of the wierdness of that particular jeep model. Link to comment Share on other sites More sharing options...
mjeff87 Posted October 21, 2019 Share Posted October 21, 2019 The motor mounts themselves can be changed via bolt-on, but the frame horns are welded to the frame (unlike XJ/MJ's that are bolted on). Sorry to be the bearer of bad news. I briefly considered a 4.0 swap into my old TJ, until I learned that. Link to comment Share on other sites More sharing options...
Eagle Posted October 21, 2019 Author Share Posted October 21, 2019 Bummer. Thanks for the heads up. Link to comment Share on other sites More sharing options...
kryptronic Posted October 21, 2019 Share Posted October 21, 2019 For both the YJ and TJ platforms, the frames are the same during each generation (87-95 used one style, 97-06 a different style). During those years the same frames were used for all engines, and just the motor mounts welded to the frame were different between the 2.5 and 4.0, and in different locations. You'll find the 2.5L frame horns you have now are about 8 inches too far back and at least one of them will not work (one does work for both engines on the YJ, the other does not - I have no idea on the TJ). Link to comment Share on other sites More sharing options...
derf Posted October 21, 2019 Share Posted October 21, 2019 Mountain Off Road makes conversion brackets. https://mountainoffroad.com/collections/wrangler-tj/products/4-0l-straight-6-motor-mounts-97-06-jeep-tj You do have to cut off the original frame horns and weld these new ones on. But it's not difficult work. Link to comment Share on other sites More sharing options...
kryptronic Posted October 21, 2019 Share Posted October 21, 2019 4 hours ago, derf said: Mountain Off Road makes conversion brackets. https://mountainoffroad.com/collections/wrangler-tj/products/4-0l-straight-6-motor-mounts-97-06-jeep-tj You do have to cut off the original frame horns and weld these new ones on. But it's not difficult work. Check my build thread for my 95 Wrangler (see link in signature) - I had a 2.5L frame which I needed to drop a 4.0L engine into. Not hard. Just careful cutting and welding. Good to know aftermarket pieces are available because the frame horns are different 2.5L vs. 4.0L. Link to comment Share on other sites More sharing options...
Eagle Posted October 21, 2019 Author Share Posted October 21, 2019 Good stuff. Thank you, Gentlemen. I have sent my compadre a link to this thread. Gotta help him out as much as possible. I can't do much physically yet, but he's been a YUUGE help to me while I'm recovering from hip replacement surgery. I owe him -- big time. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now