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I know some of you will read the title and think you know what I'm asking, but I'm not asking how to put a 6 speed behind my LLY.
I'm swapping my LLY out for a LBZ and I have a stage 5 Suncoast built 5 speed trans that works great. The trans I'll be getting with the motor/swap was a flood car,(not same truck as the engine) so getting reasonable deal on it. After cleaning obviously, I was going to swap valve bodies, PNDRL switches and wiring harnesses,(inside and out) and I'm not sure what else? Questions: Any reason I can't do that and anything I am missing in "converting" my 5 speed to work as a 6 speed behind the LBZ? Yes, the ECM and TCM will be from the LBZ along with all the other wiring. Main question - can it be done and any reason I shouldn't?
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'03 CCSB GMC 2500HD 4x4 w/LBZ swap. Lowered 6", work in progress! |
#2
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Will it never end?
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Shop 714 870 7300 Cell 310 918 9678 Tuned by Idaho Rob. |
#3
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Take it easy on him. He's a naval officer and they haven't been doing too hot. At least in the Pacific anyways.
Sent from my SAMSUNG-SGH-I747 using Tapatalk
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-J.R.- _______________________________________________ 2004 LB7 2500HD 4X4 CCSB Mods: LDS 63.5mm turbo, 45% SAC injectors, Built Allison, Mishimoto IC piping, EFI Live, Modded stock intake, Modded intake horn, Intake heater Deleted, Water separator/10 micron/Lift Pump, CAT Filter, 3" down pipe, MBRP 4", Incognito tie rods, High Idle, MA pump rub kit Tunes by Idaho Rob Trans Kit from Evan @ Limitless Diesel |
#4
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James 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 motor died/bent rods = 3/11/11 back from the dead 7:04pm 4/9/2012 Limo is back in the garage, now driving a built chevy tracker ![]() Tailgate Crew Member #4 |
#5
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Hey - In my defense, all my previous searches turned up folks trying to put a 6 speed behind a LB7 or LLY which is a no-go and I'm fully aware of that.
And I did finally just find my answer - from Mike no less,(and really Ben right after him): http://www.duramaxdiesels.com/forum/...eed+conversion But in short - This will be a LBZ setup, I just don't want to waste my time/money spent on my existing built 5 speed if I don't have to. Appears I can use my 5 speed as the base.
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'03 CCSB GMC 2500HD 4x4 w/LBZ swap. Lowered 6", work in progress! |
#6
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Water in transmission is a huge huge issue.
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2006 ccsb Lbz Tow rig 2006 rclb 6.6 The fun stuff. Built motor, trans, triples |
#7
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You don't even have to swap valve bodies with your 5spd. As long as whatever TCM you use is set up for 6th gear.
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04 GMC ECSB LLY - Mix breed trans/SC1056 - Profab - PPE - Kennedy twin pumps/pickup - Danville tuning: 531/944 I can't complain, but sometimes I still do Jesse |
#8
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Copy on the water inside the trans issue. Just want to know if physical parts work as I didn't intend to just swap it straight over and I see how that could be read-into my response - but even a thorough cleaning and solenoid replacement may not be enough.
The important part - I wanted to ID what parts had to be swapped. From the post linked, ben said: "To make a 5-speed trans work with a 6-speed TCM (an actual factory 6-speed TCM), you'll need a factory 6-speed valve body, the 6-speed internal NSBU (technically called an IMS), and the 6-speed valve body wiring harness." And Mikes comment before that one: "Swap the valve body, internal harness, shift shaft and internal linkage and mode switch." I'd rather not chase my tail when its installed back in the truck. I'm comfortable with custom/details required to make the swap work, but don't pretend to know it all and appreciate the thoughts/feedback.
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'03 CCSB GMC 2500HD 4x4 w/LBZ swap. Lowered 6", work in progress! |
#9
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I may not know much about this - but I am nearly 100% certain that is not correct at all.
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'03 CCSB GMC 2500HD 4x4 w/LBZ swap. Lowered 6", work in progress! |
#10
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![]() Quote:
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'04.5 2500HD Silverado LT CC/LB, LBZ D/A Dark Grey Metallic, 05+ HD Hood & Grille, 192k and counting Mike L ![]() EFILive, PPE Race Valve, KD Twin Lift Pumps & Billet Fuel Pickup, MBRP 4" "Cat-Back" T409 straight piped. 300.59' 3rd place first pull Best 1/4 times: Truck: 14.067 @ 96.29, weighing in at over 7200# 446.4RWHP/820.2RWTq Car (95 Cougar 4.6L V8): 14.680 @ 94.00 "The FIRST weapon is the mind, all others are incidental." "I'd rather be judged by twelve than carried by six." |
#11
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Does the 6spd tcm not read the solenoids correctly??? Is it because of the nsbu??? The valve bodies might be different but there's no extra hardware to activate 6th gear, it's in the tcm.
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04 GMC ECSB LLY - Mix breed trans/SC1056 - Profab - PPE - Kennedy twin pumps/pickup - Danville tuning: 531/944 I can't complain, but sometimes I still do Jesse |
#12
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![]() Quote:
![]() ![]() Sent from my 2PS64 using Tapatalk
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'04.5 2500HD Silverado LT CC/LB, LBZ D/A Dark Grey Metallic, 05+ HD Hood & Grille, 192k and counting Mike L ![]() EFILive, PPE Race Valve, KD Twin Lift Pumps & Billet Fuel Pickup, MBRP 4" "Cat-Back" T409 straight piped. 300.59' 3rd place first pull Best 1/4 times: Truck: 14.067 @ 96.29, weighing in at over 7200# 446.4RWHP/820.2RWTq Car (95 Cougar 4.6L V8): 14.680 @ 94.00 "The FIRST weapon is the mind, all others are incidental." "I'd rather be judged by twelve than carried by six." |
#13
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5 speed
![]() 6 speed ![]() Sent from my SAMSUNG-SGH-I747 using Tapatalk
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-J.R.- _______________________________________________ 2004 LB7 2500HD 4X4 CCSB Mods: LDS 63.5mm turbo, 45% SAC injectors, Built Allison, Mishimoto IC piping, EFI Live, Modded stock intake, Modded intake horn, Intake heater Deleted, Water separator/10 micron/Lift Pump, CAT Filter, 3" down pipe, MBRP 4", Incognito tie rods, High Idle, MA pump rub kit Tunes by Idaho Rob Trans Kit from Evan @ Limitless Diesel |
#14
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And that's why I love this board - tech brought.
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'03 CCSB GMC 2500HD 4x4 w/LBZ swap. Lowered 6", work in progress! |
#15
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And don't forget the f solenoid is completely different from 5 speed to 6 speed. 5 speed goes to 96% duty cycle at full lockup, 6 speed only goes to 67% at full lockup, and they do not interchange. You may also run into issues with your 03 base trans. Some 03's use the smaller cooler ports, and do not have the correct pump assembly for the g solenoid to function as that wasn't added until 04. Not sure what would happen if the g solenoid is commanded on without the correct hydraulic circuitry for it(but you could put a dummy solenoid in the pan to get around it).
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1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that, DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit. ![]() |
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