SERVICING INSTRUCTIONS AND ILLUSTRATED. PARTS LIST FOR HEWLAND DG-300 MARK 2 MANUAL MODIFICATION HISTORY. 15. 17. 18. 19. 20. 22. Tony Wilson Hewland Specialist in English East Midlands Service to Racing Car DG300, LG500 & 600 ranges, but also covering the current sequential units, from a Gear ratio changing instructions Starter gear ratio guides MK 8/9 4 speed Results 1 - 42 of 42 -Here we have a selection of the Hewland manuals, some are modern and some are very old, meaning the gearboxes have been updated and revised slightly To ensure the continued provision of world-class services for its full historic range of transmissions, Hewland Classic Limited commenced trading in August, So please be patient if you are having to use one of the original ones. Home; Manuals. Manuals. MK9 · LD 200 4&5 Speed · FT 200 · DG 300. Some of the manuals are out of date – we will update them when Hewland MK9; LD 200 4&5 Speed; FT200 FG400, FGA and FGB; DG 300; LG500/LG600. Hewland DG300 5 speed Gearbox Complete with gear change and clutch slave cylinder. Output flanges suit 930 CVs. Brand new spare gear sets. Has had new CHANGING GEAR RATIOS on the HEWLAND DG 300 TRANSAXLE numbers in square brackets refer to illustration numbers in the Hewland DG300 MANUAL Hewland is a British engineering company, founded in 1957 by Mike Hewland, which In addition to the traditional manual transmission products covering almost all the racing and rallying classes, Hewland now DGB, 1981, 440 lb/ft, 5, 134 lbs, Higher torque version of DG300 Mk.II, stronger case, for sports car endurance.