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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #1  
Old 01-17-2015, 10:36 AM
hemiexp04 hemiexp04 is offline
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Default limp mode after 6400 shift

Well truck is a 2014 8 speed ram. Put my trinity on yesterday and was just messing around today. Truck obviously has traction problems with the 8 speed an 3:92s. I have been manually shifting at5900 to 6k but made a mistake did a 20 roll truck spun and hit the 6400 limiter and truck went into limp mode and service tranny came up. Made me park the truck wouldn't let me shift into park had to cut it off and cut it back on. Deleted the code and all is well. Kinda scared me for a minute lol
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Old 01-17-2015, 12:35 PM
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Just remember that if you kill that trans and the dealer figures out you have a programmer, your warranty is gone.
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Old 01-17-2015, 12:49 PM
hemiexp04 hemiexp04 is offline
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Trans is fine not really worried about it. Turning 6400 rpms shouldn't hurt the trans anyway. Now maybel a wot downshift to 6409 is a diff story.
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Old 01-17-2015, 05:28 PM
RayK RayK is online now
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Well, you really don't know the trans is fine unless you pull it and disassemble it. Clutch packs don't like abuse and generally won't take as long to go into limp mode next time. You took one life off the tranny, now how many does it have left.

GM will warranty block the whole truck if a tuner if found and it's for the life of the truck (next owner included).

For me, it's better to have a car to play with and I don't abuse the truck.
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Old 01-17-2015, 07:11 PM
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Quote:
Originally Posted by RayK View Post
Well, you really don't know the trans is fine unless you pull it and disassemble it. Clutch packs don't like abuse and generally won't take as long to go into limp mode next time. You took one life off the tranny, now how many does it have left.
X2!

Throwing your first code in those conditions is often a sign of eventual imminent failure. There's a minor chance its okay for a while but it's much more likely that several frictions have been worn and steels will have heat marks...



If it happens again try to remember the code stored on your tuner before you delete it next time.

I've already seen just about all of them





I can shift at 6200 rpm, but usually keep it to 6000
The trans may be okay but stock valve springs won't last at 6400 too many times
...then you're in for Engine trouble on top of a fried trans.

Don't push your luck unless you have a dependable second vehicle for down time.

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Last edited by BlackRamHemi; 01-17-2015 at 07:13 PM.
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Old 01-17-2015, 11:05 PM
hemiexp04 hemiexp04 is offline
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Not sure how many of you have actually drove or have a 8 speed but the shofting/wheels spin takes time getting use to. I wasn't actually try to shift at 6400 guys.... I was doing a 20 roll spun bad and hit 6400 limiter and threw the truck in limp mode. It doesn't throw a code it just puts it in limp mode. Makes you stop turn the truck off it puts itself in park, crank I back up put it in drive and go on about your business. It does make the engine light come on but no actual code. So no I'm not worried about the trans. I'm sure it's fine. If it can't handle that then it sure as hell won't last with any spirited driving. And if it breaks oh well.
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Old 01-18-2015, 01:29 AM
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The 8 speed tranny specification from the manufacture states that the input shaft has a maximum revolutions per minute of 6000.
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Old 01-18-2015, 11:28 AM
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Playing, (or just plain effin up) can get expensive and/or 'mighty inconvenient'. Used to do it just as much as anyone else in my younger days. Eventually, it loses it's appeal.

(We didn't have '20 rolls' back when I was young,,, we could only afford '50 cent roll's' back then!! LMAO!!!!)

Last edited by HoustonHemi; 01-18-2015 at 11:38 AM.
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Old 01-18-2015, 12:18 PM
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I find it hard to believe that a trans can go into limp mode and turn on the MIL without setting a DTC in the PCM. Hopefully Trans Engineer will chime in and offer his opinion.
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Old 01-18-2015, 05:33 PM
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I'd probably Pee My Kilt if my RAM did that. What would an 8 speed set you back out of pocket?

Last edited by roo; 01-18-2015 at 05:34 PM. Reason: Bad Spellin
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