Sonnax or bd-power line booster?? - Dodge Cummins Diesel Forum
07.5 - 09 3rd Gen 6.7L Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine, Transmission, etc...NO ADVERTISING

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post #1 of 62 (permalink) Old 04-03-2011, 10:16 PM Thread Starter
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Sonnax or bd-power line booster??

You can see the mods I have in my sig.... At around 104,000 my torque converter started slipping so took it to the dealer and had it replaced. It's been two weeks and this one is slipping and making the trans over heat therefore going into limp mode. I'm not to the point of buying a good aftermarket torque converter so I thought about buying a line pressure booster. I've had the H&S overdrive software for about 15,000 miles now also. I wondered which booster is better.... Sonnax or BD-Power and can I use one of these with the overdrive software?
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post #2 of 62 (permalink) Old 04-03-2011, 10:22 PM
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there both going to be the same thing, just a resistor to fool and up line pressure, but like many have found out, the line pressure can only go so high because of mechanical parts in the tranny, the h&s ups the line pressure so stacking with it, shouldnt do anything, but there has been a few say they have noticed a difference and the overdrive software works better with the line booster stacked.


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2009/ 3500/ Laramie/ Mega Cab/ Electric Blue/ Blackmaxx MCC tuned/ATS Stage 6 48re/ TS Mp8/ 5" Dual Exhaust/ 66-74-14/ Pdi manifold/ 50% over nozzles/ H&S Intake Horn And Boost Tube/ Afe stage 2 CAI/ Stage 1 Cp3/ GDP Maximizer Kit/ Shaved,Flycut,Coated Pistons/ A1-H11 Headstuds/ GDP CCV Kit/ 8" Lift/ 37" Toyos. 648 hp 1351 tq uncorrected
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post #3 of 62 (permalink) Old 04-03-2011, 10:39 PM Thread Starter
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there both going to be the same thing, just a resistor to fool and up line pressure, but like many have found out, the line pressure can only go so high because of mechanical parts in the tranny, the h&s ups the line pressure so stacking with it, shouldnt do anything, but there has been a few say they have noticed a difference and the overdrive software works better with the line booster stacked.
Thanks man...I think I'll go ahead and get one or the other as cheap as they are. The mechanic that worked on my truck at the dealer said that there is a valve on the pump in the trans that is restricted. He said he had heard of a kit for a larger valve to produce higher pressure? Is there any other cheap upgrades I can do to lengthen the life of the trans?
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post #4 of 62 (permalink) Old 04-04-2011, 08:26 AM
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If it's going into limp-in mode, what faults do you have? A slipping TCC will light the MIL but should not put you in limp mode.

I doubt a line pressure "booster" will do much for you. The main regulator valve will only go so high, no matter how much you try to "fool" it. And if the TCM detects slippage, it already cranks up the line pressure. So I think you need to deal with whatever fault codes you have first.

With 104K miles on it, replacing the main valve body assy with a new (anodized) one would probably be a good idea. This can eliminate a potential problem with SSV bore wear that causes P0871 faults and OD clutch distress.
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post #5 of 62 (permalink) Old 04-04-2011, 08:35 AM Thread Starter
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If it's going into limp-in mode, what faults do you have? A slipping TCC will light the MIL but should not put you in limp mode.

I doubt a line pressure "booster" will do much for you. The main regulator valve will only go so high, no matter how much you try to "fool" it. And if the TCM detects slippage, it already cranks up the line pressure. So I think you need to deal with whatever fault codes you have first.

With 104K miles on it, replacing the main valve body assy with a new (anodized) one would probably be a good idea. This can eliminate a potential problem with SSV bore wear that causes P0871 faults and OD clutch distress.
Thanks TE for chiming in... I know your the man to talk to about all this.

My trans got to around 200 degrees then code p0700 came up. It was the same code as last time when the dealer told me my tc was slipping therefore making the trans too hot. Does this make since?

Replacing the valve body assy.... Is this necessary if I decide to put a aftermarket tc in and is it something I can do myself?
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post #6 of 62 (permalink) Old 04-04-2011, 08:52 AM
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200 degrees is nothing to worry about. I wouldn't get concerned unless you were running over 230F sump temp, and even that isn't extreme. Cooler is better, but operating at 200F will not result in rapid trans failure.

The P0700 is a flag (in the ECM) that tells you there is some other fault set in the TCM. Your scan tool (like most aftermarket ones) apparently only reads codes in the ECM. You need to have your dealer check the trans codes (in the TCM), then let me know what you've got.

Yes, a valve body swap is really simple and you can DIY no problem. But check the faults first - that will give us a clue as to what's going on.
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post #7 of 62 (permalink) Old 04-04-2011, 11:39 AM Thread Starter
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200 degrees is nothing to worry about. I wouldn't get concerned unless you were running over 230F sump temp, and even that isn't extreme. Cooler is better, but operating at 200F will not result in rapid trans failure.

The P0700 is a flag (in the ECM) that tells you there is some other fault set in the TCM. Your scan tool (like most aftermarket ones) apparently only reads codes in the ECM. You need to have your dealer check the trans codes (in the TCM), then let me know what you've got.

Yes, a valve body swap is really simple and you can DIY no problem. But check the faults first - that will give us a clue as to what's going on.
Around 180 degrees my trans goes into limp mode... Where it only runs in 1st and 4th. So if my trans is safe up to around 230 degrees then why is it in limp? And how do others run that high of temp without throwing a code? It stays in the 150s whith the black Maxx on stock and me manual shifting.

I'll stop by the dealer asap and let you know what their scan tool says!
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post #8 of 62 (permalink) Old 04-04-2011, 12:12 PM
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1st and 4th gear limp-in is what we call "logical limp-in" and is typically in response to internal slippage within the trans (not the TCC). This is not related to trans temperature per se, but apparently when your trans gets above 180 sump it leaks enough, to slip enough, to blow a gear ratio error fault.

You should be able to run 250-260 sump temp without causing any slippage (although you wouldn't want to run that hot for extended periods). You have an internal problem, either a cut piston seal, or a burned clutch, etc that is giving you slippage. This could be related to a worn SSV bore in the valve body (it can leak pressure out of the OD clutch passage, resulting in OD clutch slippage).

Let me know what codes the dealer finds. Do you notice any slippage when it's in limp-in? If not, maybe you haven't damaged anything too badly yet, and if you're lucky maybe a simple valve body swap will fix you up. But let me know what they say....
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post #9 of 62 (permalink) Old 04-04-2011, 02:05 PM Thread Starter
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1st and 4th gear limp-in is what we call "logical limp-in" and is typically in response to internal slippage within the trans (not the TCC). This is not related to trans temperature per se, but apparently when your trans gets above 180 sump it leaks enough, to slip enough, to blow a gear ratio
Let me know what codes the dealer finds. Do you notice any slippage when it's in limp-in? If not, maybe you haven't damaged anything too badly yet, and if you're lucky maybe a simple valve body swap will fix you up. But let me know what they say....
when I took the truck in last time they hooked up their tool to the obd2 port and drive the truck. They told me the tq was slipping and making the trans hot. They also said that all the other components in the trans were in perfect condition. I don't knotice any slippage in limp that I can remember as I drove it today and never went into limp.

I will let you know!
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post #10 of 62 (permalink) Old 04-04-2011, 08:11 PM
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wore valve body accompanied with performance enhancers, and over 100k on the clicker is going to have smoked overdrives and possibly the beginning of the 4-C pack as well. "JMO"

But what ever the problem is you can be assured that TA will set you straight as he is full of knowledge and very valuable to this site.

Just sayin
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post #11 of 62 (permalink) Old 04-08-2011, 12:03 AM Thread Starter
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Well I finally got my truck to the dealer today. It went into limp at around 150 degrees right before I got there. They said a tcm code threw that was related to low pressure like the pump was bad or one of the two valves in the pump. I did not get the code that it threw so I don't have that info. I'm taking it in Monday so they can drive the truck with the scan tool hooked up then diagnose the problem.

TransEnginere... Is there any way that this was the original problem a few weeks ago and that my original torque converter was ok? Would the pump or valves cause the tc to slip and overheat?

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post #12 of 62 (permalink) Old 04-08-2011, 07:06 AM
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A bad pump (excess side clearance, sticky regulator valve, etc.) that causes low line pressure could have caused your other problems. Again, based on your history, I don't think your TCC was slipping - I think you had internal slippage within the trans (apparently due to low line pressure when the trans got warm). That internal slippage would put you in logical limp-in, which inhibits TCC engagement, which would eventually cause trans overheat if you continued to drive it in that mode.

Low line pressure could be caused by something outside the pump (bad control system), although in your case, since it's temperature-related, I suspect an internal pump problem is most likely.
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