is there something i can fix or are these trucks really this slow
 

my truck is just a pain in the ass to drive on the highway, it moves great around town but to maintain a reasonable highway cruise i have to run with the pedal just a hair from the floor. the truck has 4.10s and 35s, 5 speed, and it does about 85mph pedal to the floor at 2800rpms. i love the truck but i have to question all the hype about these trucks, when i come up to a hill pulling a trailer or even empty the truck slows down and i have to dig deeper into the pedal, when i want to pass someone i have to floor it, if im doing 80mph iv got nothing left to pass anyone with... my old half ton chevy did better even back when it was basically a stock truck on 35s.

so what all mods have ya done........yer sig dont say much so its hard to give advice here

x2

sounds like it needs a little tlc

tell us what the usual fuel and wastegate mods you have done:humm:

With 410 rear 80 mph will about it for speed. :nope:

4k gsk kit will solve ur problem:tu: i had same issue.... diff is night and day

yea i wanted to do the governer spring and do the valve springs as well, but i just know i wont have the money for it any time soon... its also hard to get the motivation to work on a truck that always runs, i bought this truck so i could stop wrenching on my truck every other day lol. i know it would make a world of difference since the fuel tapers off around 2200 on the stock governer spring and my problem is my highway cruise is around or past that, thats what gives me the lack of pedal feel on the highway.

the truck just got alot of tlc actually, i just did the kdp, timing seal, resealed the valve covers, oil change, fuel filter, ect. its a healthy motor. it makes 35 pounds of boost, the tubo has no play at all and is in great shape overall, it has no no fuel plate, afc housing all the way forward, star wheel maxed out, its got a 5" exhaust and a k&n filter and thats about it, pretty typical of what youd see in any ole 12v.

my buddy just bought a truck identical to mine, it was one i was going to buy before i bought mine actually, he wouldn't come off the price enough for me. single cab long bed, 5spd 4x4, same size tires, i mean this truck is IDENTICAL, the only difference is the color and he has a cargo light and cruise(which im jealous of). and it will outrun my truck. and his turbo isnt even turned up, just a 0 plate and star wheel turned up. the trucks run pretty similar side by side but he does edge me out everytime and he says he can do over 90mph. he also has 4.10s. and yes it is a 94, should both have 185hp pumps.


i think my clutch is just shot?

hey man im in the same boat but my smoker is definately not perfect. im actually running on 5 cylinders and i have a stock tranny with 333,000 miles on it. i got 215hp injectors, intake and exhaust with a little tuning to the afc pushing 26 pounds and im running 85 mph no problem still making it from houston, tx to pensacola, fl on one tank of fuel. so your problem may lie within the beast :humm: or you just got a dud :nope:

my truck must have been built at 5:00 on a friday...

with stock governer springs and 4.10 gears youre not gonna see much as far as speed. Unless you tow quite a bit, I would recommened switching over to 3.55 gears. At the very least put in a 4k GSK kit, itll help your top end out considerably.

have you cleaned out the screen on the fuel bowl on the bottom of the fuel heater assembly by your lift pump, ( commonly overlooked and get plugged off with garabage )also check fuel pressure, anything over 15 plus is good, if it's low check your fuel relief valve and or up grade it to a 35 psi valve,( mine had that problem, i almost got out and shot it one day to put it out of my misery ) and last but not least make sure your lift pump is in good shape, most of them only last bout 100,000 miles or so, if you need a heavier pressure relief valve replace your fuel filter with one that does not have the drain on the bottom cuz they will got to leaking with the higher pressure, i was running 30 plus boost on my hx35 with stock 180 injectors pulling a hill before i did my tear down, and could bury the speedo with a 3k spring kit with 3:55 gears, and a hopped up tranny,, good luck bud hope this helps, :c:

When i still had 3.54's i hit 112 mph with my 40's. lol didnt know she could do that. but it was scary. I would definetly check your fuel pressure and get a gsk when you can.

where is the test port for checking fuel pressure on these things? will my regular fuel pressure tester kit that i use on my gaser work?

if you go with higher gears like a 3.54, get a smaller tire for sure or itll bog down, as far as power goes you have the most universal platform for power. diesel power just made about 250hp and 670ft lbs at the wheels with next to free mods with a 12v:rocking:!

im leaving the gears alone, just gonna save my pennies for the 4k spring and valve springs and im gonna go ahead and check my fuel pressure. for now iv got other problems to deal with, i brought my trucks out to do some truck pulls tonight and snapped something in the front diff... the chevy held together all night and the cummins let me down, kind of surprising really. i dont think my issues with no top end are from a slipping clutch because i worked my clutch hard tonight and the truck didnt get any slower, actually drove home just as good as always.

You will be very happy with the 4k,just going to have to keep an eye on the pyro after. a turbo will soon follow most likely then she will really pull hard

I'd leave the 4.10's in there running 35's. I believe 2800 rpm is the max governed rpm's for your engine and being bone stock, it's definitely not going to be a rocket ship. Be sure you are getting full fuel flow/pressure to the lift and injection pumps, perform a couple free mods and throw in the 4000 rpm springs and it will seem like an entirely different truck!

The chevy didn't break anything 'cause it's only making half the torque as the Cummins :w2:.

P.S. The Cummins didn't let you down. The Dodge did. There's a difference. :tu:

Mine used to react the same way... pedal almost all the way to the floor and nothing left to pass with. Turned out my injectors were on their way out, then the VE pump gave up the ghost. Now with a rebuilt 32k rpm pump & POD 300 +55 injectors it flys with a minimal amount of right foot and will run out to 180km/hr !

For him I think its simply a result of 4.10 gears with stock gov springs. By the time the truck is hitting 75-80 mph, its probably already starting to defuel.

you are right, from what iv read they start to defuel by about 2200, i cruise around 2500 to maintain 70mph. 80mph is a struggle.

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the chevy makes around 550hp and torque. it has more power then the cummins by far, torque may be about the same, definitely not delivered in the same manner tho. its just a lighter truck and i dont use 4x4 to avoid grenading the front diff, the last peice of half ton equipment left on that truck lol. its a fun truck to rag on, it always puts on a good show as long as you dont touch 4x4. i was and still am really surprised i had any trouble with the dodge, i realy beat the crap out of this truck and it simply never breaks, always runs good, gets me were i need to go and goes offroading on the weekends too. the chevy may never break anything serious but its like driving a race car around, always little issues, hard starting, burning up spark plug wires, headers leeking, ect, ect, its just a headache to maintain such a truck.

its hard to even get the motivation to work on the dodge because it ALWAYS runs and gets me where i need to go no matter what. i dont want to even mess with the truck.

I have the same problem with my 4.10 gears. Gotta find some top end. Going to look into the gsk upgrades

i got a 97 3500 dually with 3.55s in it i believe, and 90 is about as much as your going to get outta her. but like you said 80 and im about to the floor

I would think with 3.55's you should be able to get 100. With an NV4500, 3.55's, and 30 inch tires my Ford will hit 99. If you had 31's or 32's that number would even go up a little bit.

you maybe right, but im pretty sure 90 to 95 ill be pushin close to 3000. Ill check it out tomorrow:tu:

honestly if you add everything up on a gear ratio calculator the truck should pull 100mph with ease. at 2850rpm with a .71 overdrive, 4.10 rear end and 35" tires 80mph simply doesn't add up. the only thing that could make this realistic is 1- my speedometer is 5mph slow, and 2, bfgs suck and never run true to their size, i bet they measure out 32 or 33", even a true 35" tire that runs big like a mickey thompson still only measures a true 33 and 1/2" tall, MAYBE 34".

Well the problems with your figures is that your overdrive ratios are off just a tad. The 47RH has an overdrive ratio of 0.69, but I think most of the trucks in this thread have an NV4500, which carries a lower OD ratio of 0.75, which will make a significant change in your figures.

With a 3.55 rear end, 0.75 5th gear (OD) ratio, and 30 inch tires Im running about 2950 RPM at 99 MPH (what my truck max's out at). With all the rest the same except with 32 inch tires you're looking at about 2770 RPM. You can google search and find the formula for all that :tu:

well i crawled under my buddys truck and read the tag on the diff and he has 3.54s.

Ok well that would make the difference in your race :w2:

i have 4:10 gears on 33's and with the stock gov springs it would run 85mph and no problem holding it there it wanted to go faster plus gov springs and vaule springs arent alot of cash buy em

Yeah you can get a 4k gsk kit with 60lb springs for a little over $200

yea but im out of work right now. as soon as i get a job iv got a list a mile long for this truck lol. the gov spring and valve springs are extremely affordable.

i think i paid less than two for mine brand new just gotta know the right people and shop around good luck brother

I've got a 5 spd with a 3:54 and mine will top out at about 82 83 mph. And I have 0 fuel plate star wheel turned and alittle bit of pump work. Exhaust and intake to. But. It'll get there quick. But when she hits top end thats all she wrote. Have a 4k ask and 60lbs spring on my dresser. Just making time to do it is the problem

yea my truck gets there ok. sometimes i think its a quick truck, other times(most of the time) i think is a bit of a turd, but overal its a pretty impressive truck for a diesel truck in 1994.

i have a 94 reg cab long bed converted to a 97 ext cab short bed half ton body:w2:.. baddest half ton round.. haha i have the 5 speed with 4:10s and does top out just under 100. i have 100 hp. injectors, the hx35 turbo, upgraded clutch, pump played with:rocking: custom cut plate moved, and starwheel cranked all with running 35s. and i can burn ricers all day up to 85 mph.

sounds like a sweet ride dude :tu:

hmmmm 82-83 sounds a little low for 3.54 gears :humm:

what RPM's are you runnin at that speed and what size tires?

best way to check speed is take a gps with you
when i took my fuel plate out my clutch only lasted a month before it would slip so you can plan on replacing your clutch pretty soon

with my buddy's gps phone in hand at 70mph im really doing 74mph.

the clutch is on its way. i assume its been replaced with an aftermarket unit of some sort or at least a stock replacement because i can still lug a gear with the pedal to the floor and not have any slip. however, every now and then it definitly lets go... im just gonna let it ride untill the truck no longer moves. if it is a stock clutch id be somewhat impressed with the fact that its still working half way decent, it made it through some truck pulls and i havnt noticed it getting any worse, i snapped a front axle shaft and the clutch was still holding on.

well i somewhat solved my problem for free. i adjusted the stock governer springs 4 clicks tighter, it pulls hard right up to 3200 rpms now. the downside is i went to far, 3 clicks is whats recomended aparently, 4 clicks made the idle higher, no big deal after adjusting it back down to 850rpms but now it starts up like a duramax, takes a few revolutions unless you just crackt he throttle in which case it starts up just the same or quicker. ill probably move it back to 3 clicks and let you guys know how it goes, i might just get used to cracking the throttle before starting it tho, i already have to pull a string to start it so who really cares.