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i would be very careful about changing these engines as they are from different series model , the 5ltr 1st gen , 4.6 ltr 2nd gen ,the 1st gen used 3 different chassis the 2nd gen only 1 so there may be a mismatch with the mountings , pipe routing etc, the 5ltr is a 'windsor v8 ' which will take up more room in the engine compartment and you have to be certain that the windsor v8 comes from a mountaineer as they were used in other vehicle's and will have differences , but if you like a challenge and don't mind doing a bit of research go for it , but don't expect it to just drop in and all will be in the right place first time ,keep me posted cheers steve
What is happening to you is worn out sincronizers in you transmission. They are used to mesh the gears between shifts. They are made of brass and wear out easily on the 2nd gen cars. It grinds normally going into 2nd gear and into 3rd if its really worn. If you want a stronger transmission buy the 93 and up 3rd gen tranny. It is an upgraded transmission with dual sincros. Yours does need rebuilt. Or you can find one on the MR2 board for a good price used. I prchased a 93 trans for $1000. An older one will be about 200. Also it depends if its turbo, lsd or not. Good luck!
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