He went a loooooooong way on the dyno 
Navigator engine swap
Senior User
Joined: Dec 2008
Posts: 237
Likes: 0
From: hazleton pa
what about the flywheel....... i have herd there are too diff ones and the 4.6 and 5.4 have diff ones and will be a problem and will have to take torq conv annnnnnddddd herd the tranz will shift all weird with the swap...... plz tell me these ppl are a$$ holes
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Posting Guru
Joined: Dec 2006
Posts: 1,466
Likes: 0
From: N. Fort Myers,FL
You dont need a flywheel, you need a flexplate. The windsors and romeos use different bolt patterns.
Posting Guru
Joined: May 2006
Posts: 2,486
Likes: 0
From: Iowa
you wont need one if your engine has one on it. the only difference in the fexplate is amount of bolts to the crank shaft, if both engines had a 4r70w hooked to them then it doesnt matter. This is assuming your donor engine has a flex plate on it already.
My 5.4l that i got a had a flexplate (flywheel, same damn thing) on it already and it bolted straight to my tranny.
My 5.4l that i got a had a flexplate (flywheel, same damn thing) on it already and it bolted straight to my tranny.
Thread Starter
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Senior User
Joined: Aug 2003
Posts: 424
Likes: 0
From: Eastern, Iowa
again, depends on the tranny. More than likely, you would need the flexplate for the 4r70w because I don't think 250's came with that tranny. BUT, if your Expy has a 4r70w tranny in it, then you should be able to use the flexplate from that.
burns, the 99 Navi truck is still in the family and it was quicker than my 05, but now that I have my CAI and custom tune, the power numbers are similar (same dyno, too) so I guess we'll have to touch em off and see, eh?...
burns, the 99 Navi truck is still in the family and it was quicker than my 05, but now that I have my CAI and custom tune, the power numbers are similar (same dyno, too) so I guess we'll have to touch em off and see, eh?...