lowering b2500

Hi, I have a 2000 b2500 in the u.k, how low would the rear be if I just ran a mono leaf with overload? No joy with lowering blocks over here, I can make some but would need longer u bolts. Thanks

Flip kit would drop it some too. Mono leaf with over load will work also.

Does anybody know how to lower the front of mine B 2600 94 model