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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 03-11-2019, 09:16 PM   #1 (permalink)
gralewaj
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Replacing radiator/intercooler

Any recommendations for radiator and intercooler replacements better than stock but not $800-$1000 each? Only thread I could find mentioned spectra premium, but Iím not familiar.

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2006 LBZ 2500HD LT Summit White
ATP EFI Live DSP5 tuning, Kennedy Single Lift Pump, Trans Go Jr, SC Trans brace, MA pump rub kit, DE downpipe, MBRP 4" Turbo-back exhaust, Bilstein 5100s F/R and steering stabilizer, Sulastics, Cognito Gear- Leveled UCAs, HD tie-rods, pitman/idler supports, HD sway bar and end links. DiPricol Boost & EGT gauges, FS 2500, Nicktane 2x, Coolant Filter, AMP Power Steps, Curt 15702 hitch, Prodigy Brake Controller, 285/70R17E Toyo H/Ts on H2s

Mods: Seat belt chime disable, PCV re-route, Cabin Air Filter, Power Steering cooler, DRLs to Parking light, Kennedy headlight booster harness, NBS Cab lights, color matched door handles with chrome pulls, blacked out B pillar.
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Old 03-12-2019, 10:18 AM   #2 (permalink)
Rvn4me
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GM Part :15914079 (ACDelco #21686). RADIATOR,(CORE SIZE 34 15/16 X 23 5/16 X 2 3/16)(INCLUDES 2-14)(CONNECT OUTLET HOSE W/2" RETAINER #25806515) $302.79

GM Part :15293729 COOLER, Turbocharger/Supercharger Cooling, COOLER,CHARGING AIR(INCLUDES 8,10)
Replaced by:19370174 $324.67

You can save about $100each not going OEM.
Salvage yard and save $$$
Most of the time better = more money.
I had all my cooling stack replaced and none of them are painted. I’m sure there a lot less money and I can’t tell the difference.


Last edited by Rvn4me; 03-12-2019 at 10:33 AM.
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Old 03-12-2019, 05:16 PM   #3 (permalink)
snowman22
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Whatever you do don't put in Mishimoto, they are junk and I've heard of too many caps leaking. You aren't going to get any real performance gain unless you are moving big air with the intercooler, and the factory radiator is also decent for most applications.

Why do you want to change them?
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Sold: 2003 LB7 CCLB 350K miles
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Old 03-13-2019, 08:07 PM   #4 (permalink)
gralewaj
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“Why do you want to change them?“

Damaged intercooler fins and found a crack on top of plastic side of radiator. No leaks, yet... just getting ahead of an eventual problem.
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2006 LBZ 2500HD LT Summit White
ATP EFI Live DSP5 tuning, Kennedy Single Lift Pump, Trans Go Jr, SC Trans brace, MA pump rub kit, DE downpipe, MBRP 4" Turbo-back exhaust, Bilstein 5100s F/R and steering stabilizer, Sulastics, Cognito Gear- Leveled UCAs, HD tie-rods, pitman/idler supports, HD sway bar and end links. DiPricol Boost & EGT gauges, FS 2500, Nicktane 2x, Coolant Filter, AMP Power Steps, Curt 15702 hitch, Prodigy Brake Controller, 285/70R17E Toyo H/Ts on H2s

Mods: Seat belt chime disable, PCV re-route, Cabin Air Filter, Power Steering cooler, DRLs to Parking light, Kennedy headlight booster harness, NBS Cab lights, color matched door handles with chrome pulls, blacked out B pillar.
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Old 03-14-2019, 09:20 AM   #5 (permalink)
Rvn4me
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There a innerweb sites that you can find used at salvage yards.
Since we have a lot of repairs I go to the body shop that does our work and have gotten parts through him. They can get parts and have the resources nationally.
There are hundreds within 100 miles
These are average prices.
Grade A Intercooler is $100
Grade A Radiator is $104 six month warranty
Grade B,C are a lot cheaper
A = Less than or equal to 60k miles
B = Greater than 60k miles and less than or equal to 200k miles but greater than 15k miles per year C = Greater than 200k

Last edited by Rvn4me; 03-14-2019 at 09:37 AM.
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Old 03-30-2019, 02:05 AM   #6 (permalink)
gralewaj
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Thanks for the recommendations, I looked into a few options near me but ended up with a new Spectra Premium radiator. Decided to leave the intercooler as damage was not as severe as I had initially thought.
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2006 LBZ 2500HD LT Summit White
ATP EFI Live DSP5 tuning, Kennedy Single Lift Pump, Trans Go Jr, SC Trans brace, MA pump rub kit, DE downpipe, MBRP 4" Turbo-back exhaust, Bilstein 5100s F/R and steering stabilizer, Sulastics, Cognito Gear- Leveled UCAs, HD tie-rods, pitman/idler supports, HD sway bar and end links. DiPricol Boost & EGT gauges, FS 2500, Nicktane 2x, Coolant Filter, AMP Power Steps, Curt 15702 hitch, Prodigy Brake Controller, 285/70R17E Toyo H/Ts on H2s

Mods: Seat belt chime disable, PCV re-route, Cabin Air Filter, Power Steering cooler, DRLs to Parking light, Kennedy headlight booster harness, NBS Cab lights, color matched door handles with chrome pulls, blacked out B pillar.
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