Tranny slip/hard downshift - Chevy and GMC Duramax Diesel Forum
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Old 11-24-2012, 07:09 AM   eBay Motors  #1 (permalink)
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Tranny slip/hard downshift

I installed a DSP5 switch on my 06 LBZ and now once its warmed up it shifts hard out of and back into first. Mostly when I'm coming back to a stop in first it'll stutter. Any ideas?!
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Old 11-24-2012, 07:16 AM   eBay Motors  #2 (permalink)
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Are you driving the crap out of it without letting it relearn?


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*EFI DSP5 By: PPEI *DE Downpipe & 5" Dump *ARP Studded *Pro-Fab Deleted *Custom Re-Routed *Alligator FPRV Plugged *DHD Braced & MA Sleeved *20x12 -44's *305/55/20 Terra Graps *LBZ MP, Intake & FPR *Kleinn Horns & On-Board Air *Paramount Restyling Grill *MA Pump Rub & M1 5w-30 *All-On Mod *Maintained

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Old 11-24-2012, 07:30 AM   eBay Motors  #3 (permalink)
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Normal highway driving. I got on it a few times, but no not beating it up
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'06 DMAX Crew Cab LBZ
5" MBRP black series exhaust
S&B cold air intake
MBRP downpipe
2 1/2" rough country leveling kit w/ 285/75 tires
And a buddy is EFI live tuning it
EGR blocker plate...
www.alligatorperformance.com
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Old 11-25-2012, 09:42 AM   eBay Motors  #4 (permalink)
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Duramorse,

I have just noticed my truck doing what you describe your truck is doing. I noticed that when I accelerate, mild on the throttle that my truck seems to kind of slip in the 1-2 shift and it maybe a little soft in the shifts above, but more difficult to notice. Then, when I come to a stop, it downshifts hard as if I throw it into a granny gear.

Is this what is going on with your truck?

I"ve an 01 Duramax with 230K miles on her. I do a tranny flush and change the tranny oil every 2 years. My only mods are a stealth 2 programer, I usually run the economy mode.
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Old 11-25-2012, 09:46 AM   eBay Motors  #5 (permalink)
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Yeah that's what my truck is doing. Only every now n then when its hot. I'm gonna try flushing it and changing the filter n what not. See if it helps at all.
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'06 DMAX Crew Cab LBZ
5" MBRP black series exhaust
S&B cold air intake
MBRP downpipe
2 1/2" rough country leveling kit w/ 285/75 tires
And a buddy is EFI live tuning it
EGR blocker plate...
www.alligatorperformance.com
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Old 11-25-2012, 11:54 AM   eBay Motors  #6 (permalink)
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Please do NOT flush it. That is the worst thing you can do. Drain and refill is sufficient and won't cause any damage that hasn't already happened.


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LLY CCSB SLT 4x4
*EFI DSP5 By: PPEI *DE Downpipe & 5" Dump *ARP Studded *Pro-Fab Deleted *Custom Re-Routed *Alligator FPRV Plugged *DHD Braced & MA Sleeved *20x12 -44's *305/55/20 Terra Graps *LBZ MP, Intake & FPR *Kleinn Horns & On-Board Air *Paramount Restyling Grill *MA Pump Rub & M1 5w-30 *All-On Mod *Maintained

Willie @ Synthetic Motorsports
Kory @ PPEI
Eric @ Merchant Automotive
Jason @ Alligator Performance
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Old 11-25-2012, 11:59 AM   eBay Motors  #7 (permalink)
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Oh ok, yeah I was just gonna change the filter is all I meant. Any other ideas? Is the bully dog shift kit a good idea?!
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'06 DMAX Crew Cab LBZ
5" MBRP black series exhaust
S&B cold air intake
MBRP downpipe
2 1/2" rough country leveling kit w/ 285/75 tires
And a buddy is EFI live tuning it
EGR blocker plate...
www.alligatorperformance.com
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Old 11-25-2012, 12:37 PM   eBay Motors  #8 (permalink)
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Quote:
Originally Posted by duramorse View Post
Oh ok, yeah I was just gonna change the filter is all I meant. Any other ideas? Is the bully dog shift kit a good idea?!
Bully dog shift kit is a terrible idea!! You think you have hard shifts now?? Install that and prepare for whiplash. The allison learns around the bully dog shift kit after a few days of brutalizing itself anyways, because it is a poorly designed piece of junk.

Since you have a 6 speed, you can do the transgo jr which is the only "good" way to go. Transgo is designed differently as it has check balls at the end of the valves so the allison wont learn around it. And it has proven itself in tens of thousands of trucks. Only things you will find on the bully shift enhancer are bad reviews with lots of unhappy customers.
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Last edited by mike diesel; 11-25-2012 at 12:41 PM.
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Old 11-25-2012, 12:41 PM   eBay Motors  #9 (permalink)
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Haha alright alright just asking
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'06 DMAX Crew Cab LBZ
5" MBRP black series exhaust
S&B cold air intake
MBRP downpipe
2 1/2" rough country leveling kit w/ 285/75 tires
And a buddy is EFI live tuning it
EGR blocker plate...
www.alligatorperformance.com
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Old 11-25-2012, 12:41 PM   eBay Motors  #10 (permalink)
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See where it says junior member lol
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'06 DMAX Crew Cab LBZ
5" MBRP black series exhaust
S&B cold air intake
MBRP downpipe
2 1/2" rough country leveling kit w/ 285/75 tires
And a buddy is EFI live tuning it
EGR blocker plate...
www.alligatorperformance.com
duramorse is offline   Reply With Quote Quick reply to this message
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