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.........where do you get all of your info?...........
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.........where do you get all of your info?...........
Personally, I like the way the stock tires look so a gear change would be ideal for me.I'm sure the new gearing has its place, but for the average person, a tire change is a lot cheaper and much easier.
Why not also change the transfer-cases high range as well from 1.01:1 in high to say .98 or .92 to 1 in high range. That should really help with the speed. As for better fuel economy you're going to have spec out the engine and the rest of the gearing for the ideal combination at targeted speed. Then you'll have tailor your entire drivetrain to achieve this goal. I would change the transmission to the new Fuller 6spd medium unit it the right length, but you'll need a new clutch, I would than swap out the engine for a DT-466 something in the 250hp range, a new transfer-case ration like I said about 1: .92 to me seems to give you best top speed. You could swap out the 6.72 ratio rears for something else. I mean what are you oging to do with trucks is the issue is it just road use or offroad as well? It is for both I would use the new 6speed fuller transmission it has better overall ratios and with a OD.78 coupled a new .92 high gear range in the Transfer Case should give you a nice offroad speed. You could also reduce the low range from 1.98 : 1 to 2.00 or 2.10 : 1 really make it a monster offroad. I would put new shafts in the axles for the increase in torque. I would also put ARB airlockers in the diffs to give it better traction offroad. And again I would gear each range for maximum efficiency around 2100-2300rpm.Our company has been in communication with a client who needs 100 trucks rebuilt from A2 models to "as close to" A3 models that is economically feasible. To that end, we have been researching two systems that will enhance the client's operations.
One is a dual-circuit service brake system, and the other is a transmission option that includes a kit of parts that would increase the 5th OD gear in the 3053 transmission from the stock 1:79 to 1:61.
As usual, the general hobbyists will benefit from the research that the "real" client will be paying for. If the project succeeds, we will be able to offer these two enhancements (along with the other stuff we continue to sell) to you folks on this Forum.
I would gladly be willing to hear any thoughts you all have on these ideas.
Arthur P. Bloom
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Why not also change the transfer-cases high range as well from 1.01:1 in high to say .98 or .92 to 1 in high range. That should really help with the speed. As for better fuel economy you're going to have spec out the engine and the rest of the gearing for the ideal combination at targeted speed. Then you'll have tailor your entire drivetrain to achieve this goal. I would change the transmission to the new Fuller 6spd medium unit it the right length, but you'll need a new clutch, I would than swap out the engine for a DT-466 something in the 250hp range, a new transfer-case ration like I said about 1: .92 to me seems to give you best top speed. You could swap out the 6.72 ratio rears for something else. I mean what are you oging to do with trucks is the issue is it just road use or offroad as well? It is for both I would use the new 6speed fuller transmission it has better overall ratios and with a OD.78 coupled a new .92 high gear range in the Transfer Case should give you a nice offroad speed. You could also reduce the low range from 1.98 : 1 to 2.00 or 2.10 : 1 really make it a monster offroad. I would put new shafts in the axles for the increase in torque. I would also put ARB airlockers in the diffs to give it better traction offroad. And again I would gear each range for maximum efficiency around 2100-2300rpm.
Personally, I'd just be happy with a higher fifth gear. I'd prefer to leave my engine and everything else original. If you're going to go hog-wild and spec out an entire truck, you can do any gearing you want. What's a couple thousand dollar tranny when you're dropping 10-15K into your deuce?Why not also change the transfer-cases high range as well from 1.01:1 in high to say .98 or .92 to 1 in high range. That should really help with the speed. As for better fuel economy you're going to have spec out the engine and the rest of the gearing for the ideal combination at targeted speed. Then you'll have tailor your entire drivetrain to achieve this goal. I would change the transmission to the new Fuller 6spd medium unit it the right length, but you'll need a new clutch, I would than swap out the engine for a DT-466 something in the 250hp range, a new transfer-case ration like I said about 1: .92 to me seems to give you best top speed. You could swap out the 6.72 ratio rears for something else. I mean what are you oging to do with trucks is the issue is it just road use or offroad as well? It is for both I would use the new 6speed fuller transmission it has better overall ratios and with a OD.78 coupled a new .92 high gear range in the Transfer Case should give you a nice offroad speed. You could also reduce the low range from 1.98 : 1 to 2.00 or 2.10 : 1 really make it a monster offroad. I would put new shafts in the axles for the increase in torque. I would also put ARB airlockers in the diffs to give it better traction offroad. And again I would gear each range for maximum efficiency around 2100-2300rpm.
Well getting a higher top speed is easy, it is the extra economy of fuel consumption that is hard.Sounds like you just designed a Peterbilt,Freightliner,Mack,Navistar,Kenworth........
not so, you are only talking about less than 4500 rpm at the driveshaft. the only issue i ever had was the 90 wt oil in the transfer would foam at 70+ mph, and you should run 40 wt in the trans and transfer anyway to save fuel.Only down side is if you push the truck much faster your going to fry wheel bearins,Pinion bearings,Transfer case bearings,carrier bearings........
Well getting a higher top speed is easy, it is the extra economy of fuel consumption that is hard.
You leave the standard gearbox in place and just play around with the transfer case putting a .90 to 1 in the transfer case would increase top-speed. It wouldn't really affect the off-road capabilities much since in most cases you want to use low-range off-road anyway. So that might be the easiest way to get better speed.
Your example is a truck with an engine running 3000rpm and one with an engine running at 2500rpm of course there is going to be a top speed difference. I'm not sure what you trying to show here in this example.if getting a higher top speed is so easy, why have so few done it? my first millenium reo ran 74 mph @ 3000 rpm, the second runs 65 mph @ 2500 with stock engine.
the mpg was the easy part, and 12 mpg empty and 11 mpg / 8klb load is pretty impressive for this size truck.
if you change the transfer, you change all the ratios = less power in all lower gears, more stress on clutch, etc.
change just 5th gear everything else stays the same.
I'm not sure because you've given two rpm figures and no-context. If you want to make the example clear lets talk about wheel speed and than we figure out why one is doing 60 something at 2500rpm and the other over 70 at 3000rpm. I don't know enough about what you've done to the trucks to say anything of value. I mean you could have changed the gear ranges in the diffs of each axle and that would account for the differences in speed. You could have put a new transmission in one much lower gear ranges for the overdrive and kept the stock rear ends and tires. You could have just merely upped the top-end governor speed on the IP to allow the engine to run up to 3000rpm. To say you have is just an attempt to maintain a pretense of having more knowledge than I do but in reality you just didn't give enough information to actually make any cogent statement.thanks, but i already know you were not sure!!
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