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I had replaced mine a few years back with the Bosch Platinum, and my X ran rougher than I have ever seen it. I returned the plugs and replaced with the Motorcraft and it worked wonders. I would say it is a given not to use the Bosch Platinums in the 4.0

Lockers If you go with the E-Z Locker, you most likely have a limited slip carrier. If you do have a limited slip carrier, you will need to get a new carrier. The E-Z Locker will only fit into an open carrier. It will fit fine up front in your D35 but not in your Rear 8.8 with out putting in...

Let us know what you find out about the revolvrs. I would like to know what they saY.

4 or 5.5 inch lift What kind of wheeling do you do? If you do go offroad, go with the 5.5" I have a 91xlt with a combo, 4 inch TuffCountry lift up front and skyjacker rear springs. Stay away from Tuff Country. I have had nothing but problems. I can not get my front end to stay aligned...

NoBoundries if you go with the 32's you will most likely have quite a loss of power and would need to change your gearing. Some pepole say you don;t have to worry about power loss with 32's or even 33's, but from experience, anything larger than 31's will most likely need to have some gearing...

Rock883 I am running 32x11.50x15 on stock rims 15x7 on my 91XLT with a 4"Susp.lift. the only rubbing I get is in tight spots cranked and suspension is being fully extended and compressed.If you plan on giving it a lift I don't think you'd have any problems with 32's. With out the lift you may...