Well, the eight changes everthing.
A nine center will not bolt up your housing, A bronco diff, as far as I know, will not "just bolt in." On the other hand trac locks are not that easy to find for the eights. Do you have one now? If you do, then it would be easier to just change gears. If you have tools and you most of your work at home allready, setting up the ford diffs aren't that hard, and the gears themselfs are not a lot of money. I did my first one after reading a article in hodrod. It lasted till I tried to put 400hp though it. That was an eight too.
Since factory nine's are a little hard to find for comets, I took a nine out of a truck, cut the ends off my eight, after measuring everthing carefully. Cut the ends off the nine, since I have a wheel align rack at work I set it up, made it all zeros, and welded it up!
Its been in the car for about a year and a half, no probs.
Not for the feint of heart, but it saved me about a grand.
Kind of a long answer, isn't it?
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93LXcopcarSOLD14.3@96 @ 4500ft 2.02 60ft on street tires.
my 67 ranchero NOT A 390 ANY MORE! 460! 3.70's cast manifolds, comp cams 262H, performer, 750DP 100K out of 79 F250
NEW(oct20/02)14.58@95mph 2.3 60 ft
corrects to:13.86@100
66 merc comet351w, isky roller 600 lift 268/260@.050, vic jr. 700DP, 5000stall, 4.56's c-4, 3400lbs with driver
12.3@110 @ 4000ft 1.69 60 ft
corrects to:11.69@115
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