Every manufacturer of that era was still using old designs of gearbox leyland mf ford deere db all of them were updating old tech adding bits here and there leyland were slow to get their act together strikes finances etc but they were getting things moving towards the end marshall gained from most of this and we're themselves moving along but not fast enough and leyland did lots of development work on so many things you'd be surprised at but it was all in vain too little too late .