Ford 4R100 Tugger TransGo Transmission Reprogramming Kit Tugger. 4R100-HD2. This Super High Quality Kit is made by TRANSGO. FITS: 89-04 E4OD, 4R100 Trucks & Vans. FEATURES: For Working Trucks; Doubles low clutch holding pressure in “1” for downhill use, high speed pull-into “1”. Handles exhaust brake. Adjusts shift firmness, more cooling/lubrication, better converter feed & capacity.