stal108 Posted September 16, 2012 Share Posted September 16, 2012 Hi all i am a little worried with my truck so i am thinking of a mod,, I have a friend who works at spicer gearboxes in Wolverhampton,, I intend to give him my transfer box to change the gearing of the truck,, at the mo it does 44mph(70kmph) at 2200rpm,, = 4mpg.. The idea is to overdrive the transfer to about 1.25 so it should gain 11mph giving a max of 55mph.. at 2200rpm and hopefully near 5mpg.. The main reason is it can not be good for the engine to be at high rpm all the time so i will drive at 45mph as this is the max rated speed of the tyres. And should be down to 1800rpm still in lots of power and torque. They could have done this when built but they knew squadies would drive them and flatout,,,,, LOL What do you think?? Quote Link to comment Share on other sites More sharing options...
m109a3uk Posted September 17, 2012 Share Posted September 17, 2012 Could do with a slightly taller gear on my 4 ton daf seems to be flat out out 53 would be nice to cruise at that speed. Less wear and tear better on fuel and all that. Quote Link to comment Share on other sites More sharing options...
paulbrook Posted September 20, 2012 Share Posted September 20, 2012 All the initial trials vehicles had Allison boxes and taller gearing. The user trials vehicles had ZFs; they used less fuel, were quicker from the lights and better cross country and were much more reliable... Top speed was never a factor, after all TMs could easily outspeed their tyres (and their brakes). What was important was the whole package and the entire development of DROPS was an object lesson in finding the right balance - "improving" one thing normally meant cocking up another. So my advice is that the folks at Tolpit Lane and Sandbach knew what they were doing...... Quote Link to comment Share on other sites More sharing options...
david56 Posted September 21, 2012 Share Posted September 21, 2012 Could do with a slightly taller gear on my 4 ton daf seems to be flat out out 53 would be nice to cruise at that speed. Less wear and tear better on fuel and all that. The stickers in the cab on mine say 40mph max on motorways. also 56mph is the maximum allowable speed any how. travelling at 45 seems the best for mine as noise ok wheel wobble controllable fuel not too bad. after three hours my bum aches and I feel my teeth loosening time to stop. Quote Link to comment Share on other sites More sharing options...
radiomike7 Posted September 21, 2012 Share Posted September 21, 2012 The stickers in the cab on mine say 40mph max on motorways. also 56mph is the maximum allowable speed any how. Speed limit for LGVs in the UK is still 60mph. Quote Link to comment Share on other sites More sharing options...
Brooky Posted September 21, 2012 Share Posted September 21, 2012 Speed limit for LGVs in the UK is still 60mph. Only on a motorway though 50mph Dual Carriageway 40mph single carriageway Unless a lower speed limit is in place Strangely though if we take the A1(2 lanes), speed limit 50mph A1M (2 lanes Doncaster bypass as an example) speed limit 60mph Strange thing the law!!! However there is an argument that LGV's are limited (by law) to 56mph then if they exceed this then they are contravening C&U regs (no one though has to my knowledge ever been prosecuted though) Strange thing the law!!! Quote Link to comment Share on other sites More sharing options...
stal108 Posted September 27, 2012 Author Share Posted September 27, 2012 not sure but 1984 and beforetrucks can do 60? i hear something like that, All i want is same speed less rpm. SHOULD GIVE MORE MPG....! less transnision wear Quote Link to comment Share on other sites More sharing options...
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