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 > Your search for posts made by '4x4ord' found 510 matches.

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  Subject Author Date Posted Forum
RE: 4.10 rear in new Ford F350

. What you think you gain with the lower diff gears in negated by the steeper OD ratio. Think final gear ratio! Keep in mind that the transmission is worked harder with higher diff gears. You multiply the top gear ratio times the diff gear ratio, and the result is always more torque with the lower rear gears. Add to that, each gear change is less of a difference in road speed, keeping the engine at a better RPM. That basically applies in first gear to get a load moving. Out on highway one is in 5th and the other in 6th at the same speed. You are dismissing a taller 6th gear od ratio. I am not dismissing anything, the multiplier (rear gear ratio) is the same in every gear. So the 4.10 will put 15% more torque to the axle in every gear but it does not put more torque to the rear axle at every speed. So for instance at 60 mph on a 6% grade with 16k lbs in tow and foot to the floor the 6r140 will be in 4th with 3.55 gears and in 5th with 4.10 gears. The 3.55 will be putting 5% more torque to the rear axle. If that trailer is increased to a 22,000 lb 5ver the trucks will be slowed to 50 mph on a 6% grade. Both trucks will be in 4th gear. The 4.10 equipped truck will be running at 2518 rpm and the 3.55 equipped truck at 2180. The 4.10 will be putting 13% more torque to the rear axle. The 3.55 equipped truck will continue to slow down until it can drop to 3rd gear (48 mph). Bottom line is that 4.10s are advantageous for heavier trailers but for a 16k fiver you're better off with 3.55s.
4x4ord 09/21/19 03:09am Tow Vehicles
RE: 4.10 rear in new Ford F350

. What you think you gain with the lower diff gears in negated by the steeper OD ratio. Think final gear ratio! Keep in mind that the transmission is worked harder with higher diff gears. You multiply the top gear ratio times the diff gear ratio, and the result is always more torque with the lower rear gears. Add to that, each gear change is less of a difference in road speed, keeping the engine at a better RPM. That basically applies in first gear to get a load moving. Out on highway one is in 5th and the other in 6th at the same speed. You are dismissing a taller 6th gear od ratio. I am not dismissing anything, the multiplier (rear gear ratio) is the same in every gear. So the 4.10 will put 15% more torque to the axle in every gear but it does not put more torque to the rear axle at every speed. So for instance at 60 mph on a 6% grade with 16k lbs in tow and foot to the floor the 6r140 will be in 4th with 3.55 gears and in 5th with 4.10 gears. The 3.55 will be putting 5% more torque to the rear axle. If that trailer is increased to a 22,000 lb 5ver the trucks will be slowed to 50 mph on a 6% grade. Both trucks will be in 4th gear. The 4.10 equipped truck will be running at 2518 rpm and the 3.55 equipped truck at 2180. The 4.10 will be putting 13% more torque to the rear axle. Bottom line is that 4.10s are advantageous for heavier trailers but for a 16k fiver you're better off with 3.55s.
4x4ord 09/21/19 03:04am Tow Vehicles
RE: 4.10 rear in new Ford F350

The differeonce in 60mph high gear cruising rpm between 3.55 and 4.10 is 1524 rpm vs 1760 rpm. The power required to tow a 16k 5ver at 60 mph on level ground is only about 100 hp. The 6.7 can produce 320 hp at 1800 rpm. When peak hp is needed in the hills the 4.10 rear gears will have the transmission in 5th and the engine running 2260 rpm at 60 mph. The 3.55 gears would put the transmission in 4th gear with the engine running 2616 rpm. So the 3.55 gears are going to out pull the 4.10 gears on hills that the truck is capable of climbing at 60 mph. It takes a pretty steep hill or a very heavy trailer before the 4.10 gears offer the advantage.
4x4ord 09/20/19 04:44am Tow Vehicles
RE: New Truck and 5th wheel

My first crew cab was a SRW long bed. Since then I have stuck to the SRW short bed mostly because I like the look of the short bed better. I don't think it is a beg deal one way or the other. You definitely don't need a dually for a 16K 5ver.
4x4ord 09/16/19 01:09pm Fifth-Wheels
RE: Any of you guys winterizing with air only?

I blow out with air and sometimes I'll suck about a cup of plumber's antifreeze into the lines to protect the pump. It gets dowm to minus 30 here.
4x4ord 09/13/19 05:33am Fifth-Wheels
RE: 2020 Freightliner vs 3500 GMC Dually at the Ike

So, what is the best way to lower EGTs? There is basically three ways that I know of to lower the EGT. Less fuel, more air (more boost) or by aftercooling. I suppose a 4th way is to do what Chevy has done and add a hood scoop to draw cooler air into the air intake.
4x4ord 09/11/19 02:31pm Tow Vehicles
RE: How do you really judge TV adequacy anymore?

but the one ton srw should be badged f250/2500 Why, they have GVWR that put them in class 3 category. The real question is why newer GM 2500HD with a GVWR beyond Class 2 10K is not a 3500? And why do a lot of GM trim levels not have 2500 or 3500 on the exterior? My question is why manufacture a hd3500 diesel pickup capable of pulling the moon and then removing a couple $50 leafs from the rear spring pack to render the truck useless just to satisfy those who are deceived into thinking they want a 3/4 ton.
4x4ord 09/11/19 12:45pm Tow Vehicles
RE: How do you really judge TV adequacy anymore?

A couple of points. Yes the 80% rule is a made upe rule.... BUT, it is a good one for it's intended purpose. For the person that is new to trailering, or can't, or doesn't want to be bothered with all of the specifics.... Following this simple 80% rule will generally keep them out of trouble. That is a good thing. 2500/250 badging. I do not see this going away. Many HOAs will not allow people to have 1 ton trucks. So a 3/4 ton with 1 ton capabilities will fill this need. I have a friend that ended up in a HOA. His F350 then became a problem. Changing the badges from F350 to F250 solved it. Ford offers a no charge 10,000 lb gvwr option on their f350 srw trucks that consists of a different door sticker. I do not see the point of buying or manufacturing HD 3/4 ton diesel trucks but the one ton srw should be badged f250/2500
4x4ord 09/11/19 04:47am Tow Vehicles
RE: How do you really judge TV adequacy anymore?

I think the manufacturers tow ratings make better sense now than they ever did. The thing people need to be aware of is that HD3/4 tons are identical to 1 tons other than they have less leafs in the rear springs which prevent them from being able to carry much of a trailer. Once the manufactures stop producing these useless 3/4 tons and put the 3/4 ton badging on the 1 ton SRW everything will make sense..... it will be if a half ton won't do it you gets a 3/4 (which will be sprung like a present day 1ton SRW) if the 3/4 ton doesn't cut it you get a 1 ton which means you get duals
4x4ord 09/10/19 05:48pm Tow Vehicles
RE: Ram 2019 3500 diesel

All the diesels are amazing but i think if I was a GM guy looking for a new truck I'd find it awful hard to turn my back on a 2020 GMC.
4x4ord 09/09/19 03:25pm Tow Vehicles
RE: 2020 Freightliner vs 3500 GMC Dually at the Ike

^^^^ Maybe. Anything I have driven with an engine brake had position 1 2 or 3 and was either off or on. No modulating. Lots of RPMs left to be in 3rd and hold back a much larger load at 50MPH. I don't know where the redline is on the 9l. On a larger diesel engine I wouldn't want to see it rev much over 2100 rpm. The loads I tow I seldom see the jake operating above 1800 rpm. If the Allison behind that 9l dropped to 3rd the engine would rev to 2800 rpm which might be ok?
4x4ord 09/09/19 07:21am Tow Vehicles
RE: 2020 Freightliner vs 3500 GMC Dually at the Ike

^^^^ Maybe. Anything I have driven with an engine brake had position 1 2 or 3 and was either off or on. No modulating.
4x4ord 09/08/19 04:23pm Tow Vehicles
RE: 2020 Freightliner vs 3500 GMC Dually at the Ike

The 2019 GMC 3500 C&C Dmax is rated at 445 hp/910 lb-ft just like the pick up version. Not sure how they were able to do this with the different emissions certifications, but they are the same output. Its simple... Advertised hp and torque is understated in the pick up version. Also I don't think the GM was defueling either since during initial take off the truck seamed a bit lethargic from what I could tell, but one could say the same about the Freightliner. The GM was not putting out anywhere near its advertised HP. A truck equipped with an engine making 445 hp / 910 lb ft would have been able to make that run in very close to 7 minutes 20 seconds. I think the high altitude must drastically affect the power these engines are able to make. If the Cummins was producing the power it is advertised to make it should have made the run in just over 9 minutes.
4x4ord 09/08/19 09:03am Tow Vehicles
RE: 2020 Freightliner vs 3500 GMC Dually at the Ike

They praise the performance of the engine brake on the Freightliner over the performance of the exhaust brake on the GMC, however, if more weight had been loaded into the trailer the Duramax would have held 50 mph yet the Freightliner would have required additional brake applications. Comparing two trucks on one hill with only one weight in tow doesn't really offer an honest comparison. I'm having trouble understanding why the GM slowed down as much as it did going up the hill ..... something doesn't add up. Even back in 2015 (with 396 HP and 765 lb ft) the Duramax towed 19000 lbs up the Ike in just under 10 minutes. link I don't think your statement on the Freightliner is correct. The cruise control was holding it at 50 MPH, most likely had a lot more anchor chain in the chain locker. RAM has this feature also when the EB is in auto. I do not use it because it does not brake until about 3-4 MPH above the CC speed. I think the new GMs likely adjust the exhaust brake in auto as does the Ram and Ford. I believe in the test they had the GM exhaust brake turned to "on" which makes me think auto wasn't available in 2017. With the Freightliner Mr Truck said he didn"t have the cruise set. He said the engine brake could be set at 3 or 6 and he had it set at 6. So the Cummins was braking all it could without downshifting.
4x4ord 09/07/19 04:39pm Tow Vehicles
RE: 2020 Freightliner vs 3500 GMC Dually at the Ike

Looks to me that the GM de-fueled (cutting power) because EGT's were probably getting too hot. Big difference between initial power and sustained power. The GM's 445 horsepower is barely sustainable towing that heavy of a load with a stock turbo in a deleted truck without getting the EGT's too high so I doubt an emissions intact truck can sustain that. It would have to de-fuel to keep the EGT's in check. You may be right but isn't it surprising that the 2015 Duramax out performs the 2017? I would have thought the turbo on the 2017 would pump more air and be capable of higher power with lower EGTs.
4x4ord 09/07/19 11:31am Tow Vehicles
RE: 2020 Freightliner vs 3500 GMC Dually at the Ike

They praise the performance of the engine brake on the Freightliner over the performance of the exhaust brake on the GMC, however, if more weight had been loaded into the trailer the Duramax would have held 50 mph yet the Freightliner would have required additional brake applications. Comparing two trucks on one hill with only one weight in tow doesn't really offer an honest comparison. I'm having trouble understanding why the GM slowed down as much as it did going up the hill ..... something doesn't add up. Even back in 2015 (with 396 HP and 765 lb ft) the Duramax towed 19000 lbs up the Ike in just under 10 minutes. link
4x4ord 09/07/19 10:40am Tow Vehicles
RE: 2020 Freightliner vs 3500 GMC Dually at the Ike

Measuring the time required to tow a trailer up a hill is an accurate method of measuring rear wheel hp. It surprises me that the GM didnt smoke the Freightliner.
4x4ord 09/07/19 08:54am Tow Vehicles
RE: Ford F-350 Towing Spec

Some people worry about being overloaded but being over your gvwr can only be discerned using a scale. A truck towing a fiver that puts it a few hundred pounds over its gvwr will generally handle just fine. Too light on the other hand is dangerous. A light pin can cause serious handling and braking issues.
4x4ord 09/07/19 06:18am Towing
RE: Ford F-350 Towing Spec

In BC Canada if your truck is obviously overloaded, such as when the headlights are pointed at the moon, an officer can have you weighed and ticket you for being over your gvwr. I'm not aware of any other jurisdiction that uses gvwr as a legal number. In Alberta Canada if an officer thought you were grossly overloaded he would likely ticket you based on axle or tire rating. I've never heard of an RVer being ticketed for being overloaded. As others have pointed out a 20,000 lb 5ver will most likely require a dually to carry its pin weight.
4x4ord 09/07/19 06:02am Towing
RE: New Trailer and Truck

I pull my 16000 lb RV with my SRW and have absolutely no issues. I wouldn't be throwing a 1000 lbs of fuel in the bed of my truck though. I think the new GMC SRW could quite easily handle the load your talking without issue. I believe it has a GVWR of 12400 lbs. I've heard the 2020 Ford SRW will be 12400 lbs as well.
4x4ord 09/06/19 01:40pm Towing
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