Can anyone offer the refrence of company that offers lowering kits front and rear for 4x2 f100's

 

That's like asking who sells Mustang parts. Ok in all seriousness, No Limit Engineering, Fatman Fab, and a bunch of others sell the axle flip kit to drop the rear axle. Some better then others but you can search for them with google. I came up with 15 sites that sell them in one shape or form. I know it isn't answering your question directly but it points you in the right direction.

 

Also depends if you're talking about Twin I Beam or solid axle.

 

I thought most rear axles were built under the same principle. There are different rear perches which is expected. But the principle for dropping them applies to all rear ends.