35" Tires with 373's?

[Turbo Kidd]

Quick question for the guys who are running 35" tires. Currently my truck is bone stock, however, I plan a few mods. Top of the list is putting on a set of 35" tires, but I have 373's..... Am I going to have problems? I know 410's would be better, but any feedback you may have would be much appreciated. One last question..... What is the largest tire I can run on my stock truck and rims? I have an 03' 555HO, 4x4, auto, short bed.

 

[Coolslice]

I'm one of the few who will tell you that 35's with 373 and an auto is a mistake. I had 35's with your setup and I hated it. It bogged the truck down badly, raised EGTS, and killed my mileage. Others will disagree, but that was my experience.

 

[JCleary]

I have a six-speed, but 35's w/ 3. 73's.



Go ahead and do it. I don't think you'll regret it.



You will probably lose 1. 5mpg, though. I did.

 

[JVolpe]

I have a 48re. I have been satisfied with 315, 3. 73 & 48re combination. Had it stock for about 4 months that way before mods. I don't tow anything heavy, if I did I probably would not do it. I agree with JCleary, I lost about 1. 5mpg city driving and maybe a little mpg on the highway, though not much.

 

[CLAYTON]

I like the 373s with 35's. Just add a little more power to the truck and you'll be fine. I didn't notice as big as a mpg loss as some of the others. I'd say go for it. It sure makes the truck look good. Road trip I had over 20. 3mpg (hand calculated) at 75mph and city driving with a mix of freeway driving I average 16-17mpg (hand calculated). Towing depending on how aggressive i'm going will be from 10-13 mpg.

 

[SHyans]

Do it! By reading my sig you'll see my set up but I have no regrets.

I run the Edge @ 3 and have more power than I know what to do with.

I'm down about 1. 5 mpg too but how much of that is due to the box? Oo.

 

[MickeyMiller]

Definitly do it if you have a 6 speed. Stock tires wouldn't hook up with any throttle or slightly wet condition, resulting in significant axel tromp. 315 BFG ATs cured that. Just made a trip from Livermore CA to San Diego, 474 miles each way. Tried to 'light foot' it going down, kept the speed below 65 mph, got 21. 4 mpg! (This included a hour of bumper to bumper in LA). The return trip I drove normal (75 - 80 mph) and returned 18. 7 mpg. No hard acceleration in either direction and a pretty empty truck.

 

[Turbo_Bob]

Quick question for the guys who are running 35" tires. Currently my truck is bone stock, however, I plan a few mods. Top of the list is putting on a set of 35" tires, but I have 373's..... Am I going to have problems? I know 410's would be better, but any feedback you may have would be much appreciated. I have an 03' 555HO, 4x4, auto, short bed.

My brother has a 04. 5 325/600, 4x4, auto, with 4. 10 and installed 35" tires. It took off 2 mpg from the extra weight, extra drag, and to tall of a overall ratio.



The peak torque starts at 1600 RPM's and you want to be there or higher but not lower for sustained freeway cruse.



I did some quick number crunches:



All RPM's are at 2,000

2005 Off Road package: 33" tires, 4. 56 R&P = 59 MPH

30" tires, 4. 10 R&P = 59. 6 MPH

30" tires, 3. 73 R&P = 65. 6 MPH

33" tires, 4. 10 R&P = 65. 6 MPH

35" tires, 4. 10 R&P = 69. 6 MPH

35" tires, 3. 73 R&P = 76. 5 MPH

 

[NLamke]

I have true 35's which are slightly bigger than a friend of mine's 315's (maybe 1/4 to 1/2 inch taller and wider) 48RE, and 373 gears. Started with stock suspension. Loved it. Added a leveling kit. Loved it even more. Towed a couple times, did just fine. Added the Juice/Attitude combo, and LOVE it. Just got back from a 300 mile trip towing about 10,000 pounds. 75 to 80 mph, passing cars on two lane, seeing how much speed I could GAIN going up the hills, and got 12. 65 mpg. Empty I usually get between 18 and 19 mpg highway, and 16 to 17 in town. I'd do it again in a heart beat.

 

[Matt400]

I think it depends allot on where you drive, the roads, your loads and the speeds you see.

For me I tow a 4K boat and a 6K TT in the mountains. That's not allot of weight but our mountain driving is 40-55 mph and not wide open stuff where you can run 65 so while 35's would look sweet they just wouldn't cut if for me.



Even unloaded as I drive the windy mountain highway to work I can just manage 50 mph with my 285's which is enough to keep it locked in OD. Road conditions and speed limits keep me from going faster in my area. My 285's I believe are 32. 6" tall.



Now if I lived in the flats and saw daily freeway driving then 35's for sure so I could cruise at 75+. Running over 70 with my 285's just wastes fuel.

My 285's allow me to tow in OD on the flats when I venture out of the area.



If I were to run 35's in my area I would want a trans controller that defaulted the OD off each time I started. Plus I would no longer tow in OD even on the flats.

IMO and for my area 4. 10's are better for 35's unless you have a stick.

 

[Diesel Nut]

Got 35" tall tires on my Dually and I LOVE them!! I tow 13K lbs all day no problem. Yes, I have some mods, and I have done it without the Quadzilla, and no problems, tows great, and pulls like a frieght train! Milage for me went up or stayed the same, but didn't really drop unless I was REALLY hard on it. I tow my 5th wheel at 65, which, I think is about 1600 rmps. Managed 12. 2 mpg to and from May Madness, hand calculated. But, I think that if you want 35's its not a performance thing but an astetic thing. My 35" tires and 19. 5" wheels are a mod for looks, and if they adversly affect performance, that is the cost of the looks. Just Mod heavy enough to over come!!

 

[macdaddy]

Kidd

Running that combo 3:73/35" and a stock auto will be murder on the trans, along with any towing you'll make quick work of the 48RE sending it to an early grave.



Now forget about towing and install a performance transmission and she'll last. If you don't mind towing at 75 plus MPH forget about O/D. Coolslice is right your trucks sweet spot will more than be compromised!!!!.



Mac

 

[Bertram65]

My brother has a 04. 5 325/600, 4x4, auto, with 4. 10 and installed 35" tires. It took off 2 mpg from the extra weight, extra drag, and to tall of a overall ratio.



The peak torque starts at 1600 RPM's and you want to be there or higher but not lower for sustained freeway cruse.



I did some quick number crunches:



All RPM's are at 2,000

2005 Off Road package: 33" tires, 4. 56 R&P = 59 MPH

30" tires, 4. 10 R&P = 59. 6 MPH

30" tires, 3. 73 R&P = 65. 6 MPH

33" tires, 4. 10 R&P = 65. 6 MPH

35" tires, 4. 10 R&P = 69. 6 MPH

35" tires, 3. 73 R&P = 76. 5 MPH

Peak torque may be at 1600rpm, but I think that is misleading, you could never pull any kind of hill at 1600rpm with anything in tow. I have found 2000rpms and higher is where my truck tows best, any less and the EGTs go up and it gets pulled down on the hills until it slams into 3rd. I had 315s on for a while, they sapped a lot of power out of the truck, great if you run empty, real bad if you tow, also the lower the rpm the harder it is for the automatic.

 

[Tim]

Peak torque has nothing to do with pulling a load. Horsepower is needed to do work at any kind of useful rate. @ peak torque the engine is most efficient at turning burned fuel into torque, but @ peak horsepower you have the potential to do the most work.

 

[Matt400]

Peak torque has nothing to do with pulling a load. Horsepower is needed to do work at any kind of useful rate.

Here we go again. . I guess that 345hp Hemi woulda done a better job than my little 235 Cummins. Shoulda bought that Hemi. :-laf

 

[macdaddy]

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Peak torque has nothing to do with pulling a load. Horsepower is needed to do work at any kind of useful rate. @ peak torque the engine is most efficient at turning burned fuel into torque, but @ peak horsepower you have the potential to do the most work.

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[Turbo_Bob]

Peak torque may be at 1600rpm, but I think that is misleading, you could never pull any kind of hill at 1600rpm with anything in tow. I have found 2000rpms and higher is where my truck tows best, any less and the EGTs go up and it gets pulled down on the hills until it slams into 3rd. I had 315s on for a while, they sapped a lot of power out of the truck, great if you run empty, real bad if you tow, also the lower the rpm the harder it is for the automatic.

You need to see the dyno chart, torque peak starts at 1600 and flat lines to 2900. The H/P goes upward to peak at 2900, at 2900 is where the truck can do the most.

At 1600 rpm's is where a unloaded truck will get is best mpg, but if one adds 35" tall tires with a 3. 73 at 1600 you will be doing 61 vs. 53 mph.

I can go up a 6% grade in 6th gear with no problems, EGT at 800 F, but I agree when towing you need to get higher in the RPM band where there is more H/P to pull a load. When people put on larger dia. tires it will lower the rpm's so they will have to go down 2 gears to make up for the difference.

 

[NLamke]

I just towed close to 10,000 pounds this weekend. Big hydraulic tilt flatbed with a 79 chevy heavy 3/4 ton w/ topper on back. Went up 6 to 7% grade, in O/D, 1900 RPM at 75, no lugging, no down shift, 1,100 EGT, and still had power to accelerate over a Montana mountain pass @ over 7000 feet. My truck seems to like the 2000 rpm area the most it seems. My buddy has an 04. 5 duramaxx w/ exhaust and chip, I let him drive my truck on the way home, and all he talked about while driving mine, is how much better my truck towed than his and how he is definately going to look at Dodge the next time he buys a truck. I guess he thought the 373, auto, and 35's towed pretty darn good.

 

[Bertram65]

I just towed close to 10,000 pounds this weekend. Big hydraulic tilt flatbed with a 79 chevy heavy 3/4 ton w/ topper on back. Went up 6 to 7% grade, in O/D, 1900 RPM at 75, no lugging, no down shift, 1,100 EGT, and still had power to accelerate over a Montana mountain pass @ over 7000 feet. My truck seems to like the 2000 rpm area the most it seems. My buddy has an 04. 5 duramaxx w/ exhaust and chip, I let him drive my truck on the way home, and all he talked about while driving mine, is how much better my truck towed than his and how he is definately going to look at Dodge the next time he buys a truck. I guess he thought the 373, auto, and 35's towed pretty darn good.

That is pretty impressive, my truck has no power for pulling hills below 2000 rpm, I am also running slower, less wind resistance, when I am at 1900rpm. What was it like off the line with that trailer?

 

[Matt400]

Went up 6 to 7% grade, in O/D, 1900 RPM at 75, I guess he thought the 373, auto, and 35's towed pretty darn good.

Thats a good report and just goes to show that it makes so much difference in the area you are pulling. Even on the freeways out here you get a ticket for towing that fast. Yours did good due to the RPM's you were able to run at.

Backing off to 55 or 60 and 35's wouldn't be so great in OD.