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Diff rebuild recommendations
:rofl: Wow. That's nasty. :eek: Amazing that GM has shipped these for so long with the bad reputation they've earned.- dndj
- Post #13
- Forum: Northwest Members
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Diff rebuild recommendations
Wanted to report back - Six States in Portland, OR did a great job installing the True Trac, setup must be right because the rear end is completely silent, original ring/pinion were in good shape and reused. Good Lord this thing is effective - wet or damp roads = instant sideways with a bit...- dndj
- Post #11
- Forum: Northwest Members
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Tune and grid heater
:secret::secret::secret: :thumb:- dndj
- Post #17
- Forum: Duramax Tuning, Logging, and Gauges
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LB7: Trans Limp and P1781 / P0700 under load acceleration
Actually I'm not sure about this, I just assumed because VIN programming was advertised on the unit I purchased. I'm confident others on DD would know if the TCM VIN needs to match.- dndj
- Post #35
- Forum: Mike L's Trans Talk
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Tune and grid heater
I would also like to know. Tony said back in September he was taking his website down. https://www.duramaxdiesels.com/forum/showthread.php?t=83218- dndj
- Post #9
- Forum: Duramax Tuning, Logging, and Gauges
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LB7: Trans Limp and P1781 / P0700 under load acceleration
I would be doing the same thing - eliminate the TCM as a cause and rule that out. I bought a used TCM from an ebay seller ("deeringssales" 100% positive feedback) for $259, and it came VIN programmed for my truck. Make sure yours comes programmed as part of the price or you may have to...- dndj
- Post #33
- Forum: Mike L's Trans Talk
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LB7: Trans Limp and P1781 / P0700 under load acceleration
Great idea, thanks for confirming, I suspected that might have been the case with the ECM B fuse. :( More info that might help. The FSM says that the P1781 (changed to P0802 in 03 & up) only turns on the MIL (SES) if the power-on diagnostic for the MIL line between the TCM and ECM fails on...- dndj
- Post #30
- Forum: Mike L's Trans Talk
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Allison 5sp: 2003 limp mode with codes/HELP CAN'T FIGURE IT OUT
C0055 is an ABS code for the Vehicle Speed Sensor, in the tailshaft of the transfer case I think, assuming you're 4WD. Code sets when EBCM detects open or short on the speed sensor circuit for 0.5 sec EBCM detects absence of signal for 5 sec EBCM detects erratic signal for 0.2 sec I'm...- dndj
- Post #5
- Forum: Mike L's Trans Talk
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LB7: Trans Limp and P1781 / P0700 under load acceleration
The ECM B fuse (20A) does feed 12v to the TCM, but it also supplies the control side of the FICM relay. I don't see how your truck would even start with this fuse blown? Possible that the fuse got blown during your testing process? Hopefully you have it sorted, but if it comes back, more...- dndj
- Post #27
- Forum: Mike L's Trans Talk
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LB7: Trans Limp and P1781 / P0700 under load acceleration
TCM connector pinouts from the 03 FSM attached. You're correct on the +12v pins. An intermittent voltage supply may or may not show up while you wiggle the ignition switch. The dropouts may be only a few 10's of milliseconds which may be enough to upset the TCM but fast enough that you...- dndj
- Post #22
- Forum: Mike L's Trans Talk
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DuramaxDiesels.com Forum is up for sale.
Thanks for stepping up and keeping this site alive James. I really appreciate the help you've given me with my LB7. :thumb::thumb::thumb:- dndj
- Post #62
- Forum: Smoke Signals
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03 LB7 security light
Not sure if you've figured it out yet or not, but I just remembered had a scenario with security light on in the cluster, but the truck started and ran fine. Earlier this year after a round of troubleshooting, I had Efilive flashed my ECM back to what I thought was my stock tune and ended up... -
2005 manual 4wd select has no power to fuse
Brown wire on the axle actuator is powered with key on from the 4WD fuse in the left side dash fuse block as you said. The blue wire on the axle actuator supplies ground to the axle actuator when the shifter is in 4WD mode. In 2WD, I suspect you would measure 12v on this wire due to... -
03 LB7 security light
Official factory service manual. Found a quick pic on Ebay, looks like this, 5 volumes. -
03 LB7 security light
U1xxx codes set means one of the modules on the class 2 data bus isn't communicating. Each module is required to send a keep alive message every 2 seconds on the class 2 data bus and when no message is detected for 5 seconds a U1xxx code sets in one or more modules which detect the condition... -
03 LB7 security light
The LB7 vehicle theft deterrent system has what's called a "fail enable" mode with certain conditions which will cause the security light to remain on in the cluster but permit the vehicle to start and run. For example, this happens with DTC B2947, which is a failure when the BCM detects a... -
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Diff rebuild recommendations
Well I had the guys at Six States swap in a TrueTrac today. Kind of a beast, weighs around 65-70 lbs without the ring gear installed. Thanks for the recommendations, I've heard nothing but good things about the unit. Just for fun I took some pictures of the G80 gov-lock carnage (Grenade-80 or...- dndj
- Post #8
- Forum: Northwest Members
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LBZ electrical problem
Ok, if aftermarket it's possible that the radio power was wired into the same +12v circuit as the instrument cluster and this would create another common point of failure between the radio and the cluster. Most pro shops would use an adapter from the factory harness to the aftermarket stereo... -
LBZ electrical problem
Correct. The instrument cluster has 2 power sources: Always hot +12v sourced through either the IPC/DIC 10A fuse or the SEO B1 15A fuse with the 8S8 RPO. Hot in start or run from the IGN E 10A fuse or the SEO IGN 10A fuse with the 8S8 RPO. The instrument cluster also has 2 different grounds...