Volvo FH Conversion of 6X2 chassis to 6X4 using Rockwell / Meritor rears

I am contemplating removing Volvo FH13 480 & 520 bogeys (6X2) and replacing them with air ride Rockwell 6x4 double drive differentials with a ratio of 4.56. I have an experienced chassis guy so the cutting and welding of the chassis is not a problem. The Volvo uses an I-Shift gearbox. Are there any incompatibility problems that I am likely to pick up from a mechanical or electronic perspective? Any comments?

 

Thank u Pablo, you are always spot on. My Rockwell rears have drum brakes and are mechanical so there is little chance of putting in disc lining sensors and this will probably cause issues with the brake ECU. Can I do away with EBS and how do do the ECAS & EBS reprogramming? I have just bought VCaDS 2.35 and I am still learning the basics.

 

I run into Zim & Zambia and the roads are not the best so sometimes there are traction issues with 6x2 trucks especially mid lift. Also the mid-lift air suspension can be a nightmare the older it gets especially the valves that are quite pricey. The wheel base as well... the braking pads... I could go on and on. I have no problems though on my rear lift 6x2's

 

I am actually just down the road from Babcock DAF in Benoni and i have had a look at the CF and XF 6x4 range with the Paccar (kenworth) 8 air bag suspension system in single reduction format. It looks great & promises a lot of driver comfort air ride but I want the simplicity and ruggedness of the Eagle 9800 Rockwell bogey. My biggest worry is probably whether or not I-Shift features such as Eco roll will still work (they should but you never know) and also what that will do to my fuel consumption given that in theory the Volvo engine and gearbox will have been optimized around the Volvo rears.