LT tires on a P rated vehicle???

[ezra]

I do not know rear ends I can find out. I do know the diesels from just a few yrs back pre urine were even doing better than the new stuff. yeah as far as mpg on my 5.0 I also get about the same pulling my 12 ft clam as I do pulling the 4 place deck over extra tall with 3 sleds in it. prob like .5 mpg diff . crazy . I know it could get much better if I kept it under 80 .but if I have not changed my driving habits in 30 yrs and even more tickets don't see it happening any time soon .
the oil burners deff have less work pulling not saying they don't. 1 other thing to think about is the weight of the trucks alone between a 3500 and a 1500 .
heck they are all fine and every one needs a oil burner 1 time in there life .
when we were looking for my wife's last car we looked for a AWD wagon but because of epa requirements no one was selling a diesel in awd . so went with the 4matic gas. I am still thinking about the sprinter awd for the next truck have not seen one yet but I guess they are selling them

 

[srt20]

Just to add, my buddies 12 duramax does have urea injection. IIRC, it's the same as the new duramax, the LML engine.


It's my opinion that the current urea injection diesels get about the same mpg as the mid-00s pre emission diesels. Both from my experiences driving my 05 cummins, 04 powerstroke(when they actually ran), and the 12 duramax.

The 07.5 and newer WITHOUT urea tended to get terrible mpg. Especially the 6.4 powerstroke and the 6.7 cummins. Again, without the urea.

I also beleive if a person was to delete all the emissions stuff on a urea injection diesel, your mpg would be even better. Maybe not 5mpg, but 1-3ish.


I'm not defending diesels. I don't really care what others drive. In fact, I doubt my next truck will be a diesel. Just giving my experiences.

 

[Woodtic]

I just picked up a set of 285/75/16 Irok Super Swampers. Old enough to know better,young enough to not care. My truck is also my SXS. I may have to get a winter set,mud tires = pucker up when the snow flies.

 

[chunk06]

Seams like all my construction co workers are dropping the diesels, especially the guys that had Ford 6.0 and 6.4's. I hear the fewest complaints from the newer D max owners. No way would I want a modern diesel out of warranty, 10k repairs are common...screw that. I would like to try a 6.4 Ram.

 

[harski]

Again, thanks for the input everyone! Great information!

Mrbb, I know exactly what you're saying regarding the hill climbing etc....makes absolute sense! I only pull in 3 gear with tow mode and still try to gain some speed prior to hitting the hills as I know it'll struggle at the top. The little things one tends to do to not make the truck work so hard or to down shift. Interesting tidbit too re tire size effecting gear ratio in which I'll have to ask the dealer. I figured if I went to a larger tire it would effect my mph but never though of gearing. Hope it doesn't hurt me to bad.

So, where were we, tires?? I guess it all relates to each other right?

Harski

 

[mrbb]

Harski, yes as soon as you add larger tires, you change gearing, you also change stopping distance, your OD readings too, and it can also effect anti lock brakes too
it can also alter your shift points too as your motor will NOW be running at different rpm's due to the change in gearing
changing tires changes a LOT of things many folks think NOTHING about
been into lifted trucks in a HUGE way for the early part of my life(from mild to open class monster trucks and pro class mud bog racing too)
SO< gearing is a BIG part of how a truck pulls/tows
BUT even with lower gearing to make up for taller tires, there are still a LOT of other issue's that don't get corrected with just new gearing
weight of tires alone add there influence changes to the truck handling, MOST times its so slight we don't notice, BUT it is a change and its there/
I still say modern trucks are WAY behind in there transmissions , and why they get such low MPG's
the added costs to BUILD a better trans, NO MFG wants, they just keep doing SLIGHT upgrades, to a very old design more or less
and to be honest, I had trucks back in the 80's that towed better than some of the new one's, as far as pulling power to tow up hills and even better MPG doing so, before all the emissions crap we have now
YES new truckls make more HP on PAPER and in commercials, BUT again, its making that extra HP<> at rpm,s NO one is driving at
a HEMI makes it BIG HP at like 5600 rom's
who's driving any where at that??
at 1500-2000 its making such little HP its SAD
and what MPG would there be IF you drove at 5600 rpm??
HP numbers sell trucks to the dummys that think numbers on paper mean crap
I have too many yrs of owning old to new and doing same things and its to me really sad they came only SO far in all these yrs
more creature comforts than actual real truck improvements IMO
BUT since MOST folks drive trucks to BE cool, or to the c=grocery store, , they target to the buyers, and if more buyers DON"T use a truck for a truck, its a stand still on real truck improvements

 

[srt20]

K

Harski, yes as soon as you add larger tires, you change gearing, you also change stopping distance, your OD readings too, and it can also effect anti lock brakes too
it can also alter your shift points too as your motor will NOW be running at different rpm's due to the change in gearing
changing tires changes a LOT of things many folks think NOTHING about
been into lifted trucks in a HUGE way for the early part of my life(from mild to open class monster trucks and pro class mud bog racing too)
SO< gearing is a BIG part of how a truck pulls/tows
BUT even with lower gearing to make up for taller tires, there are still a LOT of other issue's that don't get corrected with just new gearing
weight of tires alone add there influence changes to the truck handling, MOST times its so slight we don't notice, BUT it is a change and its there/
I still say modern trucks are WAY behind in there transmissions , and why they get such low MPG's
the added costs to BUILD a better trans, NO MFG wants, they just keep doing SLIGHT upgrades, to a very old design more or less
and to be honest, I had trucks back in the 80's that towed better than some of the new one's, as far as pulling power to tow up hills and even better MPG doing so, before all the emissions crap we have now
YES new truckls make more HP on PAPER and in commercials, BUT again, its making that extra HP<> at rpm,s NO one is driving at
a HEMI makes it BIG HP at like 5600 rom's
who's driving any where at that??
at 1500-2000 its making such little HP its SAD
and what MPG would there be IF you drove at 5600 rpm??
HP numbers sell trucks to the dummys that think numbers on paper mean crap
I have too many yrs of owning old to new and doing same things and its to me really sad they came only SO far in all these yrs
more creature comforts than actual real truck improvements IMO
BUT since MOST folks drive trucks to BE cool, or to the c=grocery store, , they target to the buyers, and if more buyers DON"T use a truck for a truck, its a stand still on real truck improvements

3500 trucks rated to tow 30k plus, and you think real truck improvements are at a stand still??

I agree with a lot of your post. People buy luxury trucks. It's what sells. But bigger axles, stronger frames, safety improvements, all this stuff adds weight. How many 1 ton trucks in 1985 weighed 7500 lbs or more, had 400+ hp, got 18+mpg empty, and had more airbags than the playboy mansion?

Yes, 1500s are basically grocery getters for most, but a lot of them still have a tow rating over 10k lbs.

Of course, truck prices are also sky high from all this advancement.

 

[mrbb]

again, just cause a truck says ot MAKE 400+ hp, doesn't mean its in a area the motor is being used at
My old 440\s 454.s GAS motors towed like NO tomorrow, as they MADE HP in a place it could be used
MY old 1 ton 3/4 ton trucks were pretty darn heavy, SOLID framed trucks, seen them in accidents and come out with MINOR damage, in what todays trucks will crumble, due to design to slow impacts down, , YES they have air bags now too LOL
BUT come on air bags have been out for MANY MANY yrs now
towing 30,000 lbs
anyone doing that often in a 1 ton truck will KILL it in short time
so again its NUMBERS that folks are NOT really doing BUT on rare occasions to be HONEST here
I have seen old timers load trailer to the sky with older things and did it just fine
I have personally had 4200 lbs of gravel in the back of my 3/4 ton truck and towed a trailer with about 7k on it(jerk at the quarry OVERLOADED my truck, had gravel above my cab?? and I didn't feel like having the moron push the pile off and damage the truck

so again, YES there have been improvements, BUT in the 100+ yrs trucks ghave been out there , do you really think they came that far>
as again MY older 70\s trucks towed same tractors I still have NOW<*1949 and a 1961 model) and they did it using the same gas MPG I get in my 2006 truck
sure my truck has better creature comforts
BUT the old truck did the job and costs about 15 times less?? LOL
AND yes, economy changed too ( nothing costs what it did 40+ yrs ago haha)
so get price increases, BUT I don't feel ANY truck to day is worth even HALF what its asking price tag is)
60 K for a pick up truck?? for again a MAYBE better frame, better brakes, a higher tow rating FEW EVER use, and air bags??
transmissions are NOT hugely different not, other than they need higher skilled folks to repair them
YES I give them SOME do last a LITTLE longer, BUT again, HOW much real improvements are there as to trans 10 yrs ago, and then 20 yrs ago??
I don't see a vast improvement
and I'm a guy that bought anew truck almost every 2-3 yrs for most of my life, SO I have owned a LOT fo trucks of like size model and all that too,. and again DID same chores with them all
a pretty good to ME apple to apple first hand testing/experience?

 

[srt20]

Ok, I guess we agree to disagree then.

 

[mrbb]

Ok, I guess we agree to disagree then.

HAHA< NO offence here, we all have opinions LOL
its good to share thoughts , NEVER said I know it all, first to admit I don't
BUt as the yrs roll by you do get a feel for what you do
and sure we all live differently and do things OUR way!

 

[srt20]

HAHA< NO offence here, we all have opinions LOL
its good to share thoughts , NEVER said I know it all, first to admit I don't
BUt as the yrs roll by you do get a feel for what you do
and sure we all live differently and do things OUR way!

It's all good. If we all thought the same, we might as well have a dictator telling us what to think.

Wait, when is the next presidential election? Haha

 

[chunk06]

I have both old and new, including a 12 valve and will take the new trucks (even gasser) any day. Even towing side by side with my in laws 2010 2500HD and buddies 2012 You can notice all the improvements GM did in 2011. Not all about the engine, better chassis, better integrated brake controller, better brakes.....People are towing loads with 3/4 and 1 tons that they never would have 15 years ago.