ttruckinon Posted September 29, 2006 Share Posted September 29, 2006 My 4.0 is broke and I found a 4.0 out of a 99 for sale. Will it go right in my 91? Link to comment Share on other sites More sharing options...
87manche Posted September 29, 2006 Share Posted September 29, 2006 the brackets for the accesories are different because of the different intake. If you use your intake it should be drop in. The injectors may also have different plugs on them, easily solved if you use your old injectors, or take a dremel to the plugs in your harness. Link to comment Share on other sites More sharing options...
ttruckinon Posted September 30, 2006 Author Share Posted September 30, 2006 Thanks! Now all I have to do is buy it and swap it. Link to comment Share on other sites More sharing options...
Eagle Posted September 30, 2006 Share Posted September 30, 2006 You'll also need to drill and tap a hole in the back corner of the head for the temperature sender. The 99 sender in the thermostat housing sends data to the PCM and the gauges pull their data from the data bus. The '91 gauge is driven directly by the sensor in the head. Link to comment Share on other sites More sharing options...
GirsMJ86 Posted September 30, 2006 Share Posted September 30, 2006 You'll also need to drill and tap a hole in the back corner of the head for the temperature sender. The 99 sender in the thermostat housing sends data to the PCM and the gauges pull their data from the data bus. The '91 gauge is driven directly by the sensor in the head. ... or just reuse the head he has on his 91. should work. i have never done it but i am told it con be done. Alex Link to comment Share on other sites More sharing options...
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