I ran 0-60 tests before I just recently regeared from 3.73 and was sitting at or just barely under 10s on my gryphon.

Now with the 4.56 gearing I can't even get the tires to chirp and my times have remained the same at 10s or so, the best being at 9.1. However, I haven't been able to come close to that recently.

Now thinking it could be the usual suspects, I just did the fuel filter today, cleaned MAF sensor and throttle body today as well.

I've got a 5.4, gotts mod, 4'' rancho lift, 35'' tires, gryphon tuner with 93 performance. Truck has 74K miles, I've owned it for about 13K of those. So, I don't know whats going on with it other than what I've listed.

My transmission sits at around 163ish degrees, does that seem high? Could it be my transmission just slipping? Bad spark plugs? My engine isn't throwing any codes.

Any other insight into what is going on with this DOG of a truck would be greatly appreciated. If any other info is needed please let me know.

 

Job #1 - Datalog the truck.

Consult with PHP to determine the best course of action - no one here possesses a crystal ball. Except perhaps Jbrew

Is ALL yer maintenance up to snuff? Front O2's, good gas, fresh plugs, no engine sludge, clean MAF, TB, fuel filter, no clogged cats, healthy tranny. Yep - 163 IS too high unless yer really beating on it and never let the TC lock up. When was the last tranny maintenance?

Possible that something is causing the PCM to pull timing (elevated IATs?), or causing excessive torque management intervention.

If yall were really serious in excelling in 0-60 runs, the LAST thing you would have done is ADD static mass, rolling resistance, and rational mass (increases as a function of a square of the speed) to yer drivetrain. So I'm inclined to believe yer not.

I repeat - DATALOG. Otherwise it's ALL a SWAG.

Good luck.

 

Thanks so much for your input. I'll give them a ring-a-ding-ding and find out what the best course of action would be.

 

um what? Lots of guys have trans that run 170 all day... I see 150* dd with the factory trans cooler and 4.10s. 163* with 35s and running 0-60s is pretty reasonable

 

id have to agree ak cowboy, you dont need to worry about trans temps till about 200.

 

http://www.tccoa.com/articles/tranny/trannyg.html

^^ MGD

 

It isn't only when I'm trying 0-60's. It's when I'm cruising city/highway. It can get a bit warmer into the 170ish range when I'm going around in the mountains.

 

Lift and big tires MIGHT possibly have something to do with it.

 

Someone answer me this straight up, please.

Should I or shouldn't I have seen some kind of increase in performance going from 3.73 gearing to 4.56 gears? Everyone always talks wonders about 4.56 gearing when putting 35s on and I haven't seen a damn thing but a hit to my milage and my wallet.

I'm pissed. I'm dissapointed. I'm hugely let down and really no one seems to be able to explain to me definitively on why my 0-60 times have remained exactly the same from 3.73 to 4.56.

I don't care about the hit to my milage if and that's a big IF I get performance increases

If nothing changed about my truck aside from gearing even if there was something wrong the times should have gotten better, right?

As it stands though all I'm seeing is a tremendous waste of my time and money.

 

Believe me, I'd be pissed as well.

Yes - you should have seen an improvement. All else being equal, and once the gearing (and tire sizes changes) were corrected for in the tuning.

Having said that, something is amiss - and to determine what, instrumentation is going to be required.

BTW - what are your rpms in 4th, locked up, @ 60 mph? Just curious.

MGD

 

With gears, you are giving something up and gaining it else where. You trade low RPM's when cruising for ease of acceleration. So while you have made it easier for the truck to turn those big meats when taking off, you've in turn made it so your RPM's are much higher while cruising.

The selling point of gears is to relieve stress off of the transmission to prolong its life and to get some of the response back after bolting on bigger tires. Getting better mileage should not even be an objective.

 

74,000 miles and original plugs? Is this correct? If so this is your problem or at least a big part of it. Trans temp is great. You should be thrilled.thriled.

 

Did you get your truck retuned for the new gears? If not, your transmission is going to be shifting all over the place.

 

He runs 163* not 170*... and certainly not 195*

 

I know - that was just fyi...sorry for the confusion. It just is a bit at odds with that chart.

MGD