Duramax Diesels Forum Truck of the Week
  #1  
Old 09-16-2017, 03:40 PM
Weisguy Weisguy is offline
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Default Issues after rebuild

I've spent a lot of time trying to find what's wrong and can't find anything that fits my problem. I bought a 2001 2500HD duramax with 5 speed allison. It had a leak at the bellhousing and also came with a full transgo kit. So I took it out and decided to take the transmission apart and install the kit. After reinstalling the transmission, it slips really bad and wont move sometimes. When it does get moving, it wont shift out of 1st. I thought it might be the nsbu so I replaced it and it didn't work. I have my own shop and have built several motors before but this was my first transmission. I made sure everything was put back right. I only replaced 1 C1 clutch due to some chipping. The rest of them were in perfect shape and checked with a micrometer. I figured I would see if anyone knew anything. I was hoping for some advice from Mike L. as I understand he is the expert in these trannys. Thank you for any help
  #2  
Old 09-17-2017, 08:16 AM
Weisguy Weisguy is offline
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Ok. After hooking up an edge cts2 to the truck I found out the torque converter lock is not reading D but it does read PRN. It's showing the transmission is in neutral and don't allow movement. Any ideas?
  #3  
Old 09-17-2017, 08:32 AM
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catman3126 catman3126 is offline
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Oil level good when Idling? Codes? sump filter didn't fall out when you put the pan back up did it?
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2005 2500HD dmax, CCSB, 4" exhaust, Built motor with Carillo's .020 over 16:5.1 piston with .075 reliefs, Socal 6480 alt fire cam, ported LBZ head's, Exergy 10MM pump Stock lly cp3 on the belt, 400% LBZ injectors, S471/87 compounded with a GT5541R 106MM Fleece billet charger Werhli fab S400 install kit with bridge and piping, Merchant Auto Billet push tubes, Socal Valve springs, Socal valve covers, Socal flex plate, Mishimoto black intercooler, DSP5, Air dog 165,

1986 K10 short bed LQ4/4L80E

1984 CJ7 Powered by a 2000' LS1 5.7L



2015 LTZ Z71 LML, CCLB 3500HD.
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Old 09-17-2017, 09:18 AM
Weisguy Weisguy is offline
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The fluid is at the right level. No codes are present except when I'm messing with it and making them appear. I made sure the filter was in all the way and it wouldn't come out. I'm working on a theory about it being the wiring between nsbu and tcm.
  #5  
Old 09-17-2017, 09:52 AM
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rcr1978 rcr1978 is offline
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unplug the case connector at the back of the trans, if you have 3rd & reverse it's electrical if not it's internal.
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04 LB7 ECSB down with a cracked piston, build in progress- Wagler narrowed Rods, Callies billet crank, Mahle Race Cast pistons, Randy's Girdle, Wagler/Callies Stage 1 alterfire cam, Exergy 100% SAC's, 2 CP3's, S475/Stock twins fer now more . later
2010 LMM CCLB-Tuning/Exhaust
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  #6  
Old 09-17-2017, 10:29 AM
Weisguy Weisguy is offline
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Ok. I unplugged it and it didnt change anything other than it made it start grinding when I put it in park. The truck has gotten worse and will only move forward at 1600 rpm and it'll only move a few feet before it stops. I really need to figure out what's going on. It's confusing me so much. I have the atsg guide for the allison and have read every page trying to figure out what could cause this. I'm going to try to include a picture of the monitor that shows its displaying N when I'm all the way in 1 on the shifter.
  #7  
Old 09-17-2017, 10:31 AM
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catman3126 catman3126 is offline
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Did it shift and drive fine before you took it apart?
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2005 2500HD dmax, CCSB, 4" exhaust, Built motor with Carillo's .020 over 16:5.1 piston with .075 reliefs, Socal 6480 alt fire cam, ported LBZ head's, Exergy 10MM pump Stock lly cp3 on the belt, 400% LBZ injectors, S471/87 compounded with a GT5541R 106MM Fleece billet charger Werhli fab S400 install kit with bridge and piping, Merchant Auto Billet push tubes, Socal Valve springs, Socal valve covers, Socal flex plate, Mishimoto black intercooler, DSP5, Air dog 165,

1986 K10 short bed LQ4/4L80E

1984 CJ7 Powered by a 2000' LS1 5.7L



2015 LTZ Z71 LML, CCLB 3500HD.
  #8  
Old 09-17-2017, 10:38 AM
Weisguy Weisguy is offline
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Yes. It had a leak so I didn't want to drive far but I did make sure it went through all the gears before buying it. It won't let me upload pictures but my cts2 has a pid for torque converter lock and gear display and it stays in N for all forward gears.
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Old 09-17-2017, 11:03 AM
Weisguy Weisguy is offline
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Ok. I figured out how to force the display to be in a gear I choose. But it still won't go to drive instead of neutral. Could it be the tcm itself? It always thinks it's in neutral so it doesn't apply pressure the the cluthes?
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Old 09-17-2017, 11:18 AM
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Quote:
Originally Posted by Weisguy View Post
Ok. I unplugged it and it didnt change anything other than it made it start grinding when I put it in park. The truck has gotten worse and will only move forward at 1600 rpm and it'll only move a few feet before it stops. I really need to figure out what's going on. It's confusing me so much. I have the atsg guide for the allison and have read every page trying to figure out what could cause this. I'm going to try to include a picture of the monitor that shows its displaying N when I'm all the way in 1 on the shifter.
Well if you don't have a solid 3rd or reverse with the case connector unplugged it's internal and the trans needs to come out.
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04 LB7 ECSB down with a cracked piston, build in progress- Wagler narrowed Rods, Callies billet crank, Mahle Race Cast pistons, Randy's Girdle, Wagler/Callies Stage 1 alterfire cam, Exergy 100% SAC's, 2 CP3's, S475/Stock twins fer now more . later
2010 LMM CCLB-Tuning/Exhaust
2015 LML Cab and chassis- Tuning/Exhaust
  #11  
Old 09-17-2017, 11:22 AM
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quinton quinton is offline
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You messed something up then if it drove fine before you tore it apart.
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EFIlive dsp5 by me, Built trans by me, 68 danville, stock fuel, lifted. died 6/20/2013 Cracked piston. Best time 12.75 on fuel

Alive 11/15/13: lowered, Built motor, s475, plenty of fuel, plenty of spray. Tune 3 fuel only 11.84 @114, Tune 5 little bit of spray 11.45 @ 121. Both times with melted turbine wheel, loose turbo from pedestal with blown out flange gasket. .
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Old 09-17-2017, 11:23 AM
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Ok. I can do that. But there are 100 internal parts. I need to know which one to replace.
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Old 09-17-2017, 11:50 AM
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Default Issues after rebuild

Which ever ones you touched, it ran fine before so you installed something wrong.
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EFIlive dsp5 by me, Built trans by me, 68 danville, stock fuel, lifted. died 6/20/2013 Cracked piston. Best time 12.75 on fuel

Alive 11/15/13: lowered, Built motor, s475, plenty of fuel, plenty of spray. Tune 3 fuel only 11.84 @114, Tune 5 little bit of spray 11.45 @ 121. Both times with melted turbine wheel, loose turbo from pedestal with blown out flange gasket. .
  #14  
Old 09-17-2017, 11:56 AM
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Chevy1925 Chevy1925 is offline
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No one is there to see what you screwed up nor can we tell through the internet. At this point, it's best you take it to a shop before you really cost yourself some money.
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02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

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back from the dead 7:04pm 4/9/2012

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  #15  
Old 09-17-2017, 11:57 AM
Weisguy Weisguy is offline
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I touched everything for the c1 c2 and c3 clutches. The torque converter, the input shaft, front pump, valve body, solenoids, and a lot of clips. So I need to know which of all those pieces would cause this problem.
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