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Old 08-10-2008, 03:34 PM   #11 (permalink)
sledhed
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I recommend a tow tune and a bleeder on the wastegate line. I run a stock intake filter and stock exhaust and can tow up any hill (Coquihalla too) as fast as I want. I usually clear the Coq at 60 mph (in 4th) to keep the egt under 1300. Is your air filter clean?

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Old 08-10-2008, 08:21 PM   #12 (permalink)
Rogeled
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Mods

Yes I plan to put a tow tune to it but wanted to do at least 1 trip running stock. This is the first time I have heard that the stock filter does not flow enough. The filter looks like new and I am getting great MPG running empty. Makes sense to me and will probably get an S&B before my trip. Then add a banks bullet. Maybe I just need to hit a few hills and let her go.
Thanks for the advise.

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Old 08-11-2008, 04:09 PM   #13 (permalink)
sledhed
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Palumbo, is your egt sensor pre or post turbo? That is nice and low egt, do you know what it was with stock exhaust? I am thinking my next upgrade will be the Corsa turbo back kit.
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Old 08-11-2008, 04:16 PM   #14 (permalink)
sledhed
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I went back to the stock air filter after reading https://www.dieselplace.com/forum/sho...d.php?t=117009
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Old 08-11-2008, 04:29 PM   #15 (permalink)
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I have the stock factory AC Delco filter. It does not trip the vacuum thingy and the thread listed shows it is not much of a restriction at all.

jb
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Old 08-11-2008, 04:52 PM   #16 (permalink)
radvans
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Leave the exhaust alone, maybe do the swiss cheese mod to the air box.

I pull at 18,000 pd 5er all the time with the ppe 90hp tow tune and can keep 55mph and under 1200egt almost anywhere in socal. This was also with the 35's and before I had the trans done. Runs the same now I just don't have to worry about the 5-4 shifts on inclines.

I will agree with you that stock it does leave a little to be desired at speed but with a programmer it wakes it up.
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Old 08-11-2008, 05:35 PM   #17 (permalink)
red02
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You may try installing a 4th gear lock in switch. I installed one and use it on long hill climbs. You can search kennedy diesel for their version of instal but here is gm's.


Service Information 2002 Chevrolet Chevy K Silverado - 4WD | Sierra, Silverado (VIN C/K) Service Manual | Transmission/Transaxle | Preliminary Information | Document ID: 1243294
--------------------------------------------------------------------------------

#02-07-30-051A: Transmission Shifting In and Out of 4th and 5th Gear (Hunting) When Pulling/Carrying a Load, Unable to Manually Select 4th Gear (Install 5th Gear Inhibit Switch) - (Feb 14, 2003)


Subject: Transmission Shifting In and Out of 4th and 5th Gear (Hunting) When Pulling/Carrying a Load, Unable to Manually Select 4th Gear (Install 5th Gear Inhibit Switch)


Models: 2001-2002 Chevrolet Silverado HD2500/HD3500 Series

2001-2002 GMC Sierra HD2500/HD3500 Series

with 6.6L Diesel or 8.1L Gas Engine (VINs 1, G -- RPOs LB7, L18)

and Allison® Automatic Transmission (RPO M74)




--------------------------------------------------------------------------------

This bulletin is being revised to modify the service procedure. Please discard Corporate Bulletin Number 02-07-30-051 (Section 07 -- Transmission/Transaxle).


--------------------------------------------------------------------------------

Condition
Some customers may comment that when pulling a load, the transmission shifts in and out of fifth gear too frequently, or they would like to be able to select 4th gear manually.

Advise the customer:
A customer who requests the fifth gear inhibit switch must understand fueling systems of diesels and the resulting noise that may be heard. This noise might be objectionable to some drivers. The following is provided in an attempt to enlighten the driver/operator of the vehicle.

Diesel engine fuel injection systems that use a common rail system, as the Duramax™ diesel does, may or may not have what is referred to as pilot fuel injection at the lower engine speeds. Pilot fuel injection is defined as a pre-injection of a small quantity of fuel 5 to 20 crankshaft degrees before the main fuel injection. This pre-injection softens the main injection pressure rise and reduces combustion noise. At engine speeds above 2600 RPM, and a fuel quantity supply greater than 35 cu mm, it is necessary to eliminate pilot injection to meet emission requirements. When driving at or above these speeds, main injection combustion noise may be noticeable. It is normal and not harmful to the engine.

When traveling in 5th gear, the pilot injection to main injection transition is typically in the 136 km/h (85 mph) range, however it may also be heard under heavy acceleration and when pulling loads up a hill during shifts at or above 2600 RPM. Customers that install the fifth gear inhibit switch may encounter the fuel knocking of main fuel injection at speeds around 107 km/h (67 mph) in fourth gear between 2600 and 2700 RPM. This sound is considered normal and is to be expected.

Correction
Install the 5th gear inhibit switch using the following procedure.

Open the hood and disconnect the negative battery cable from all batteries.
Remove the heat shield over the TCM.
Disconnect the TCM wiring connectors.
On vehicles with the L18 gasoline engine, remove the three retainers that retain the Throttle Actuator Control module to the engine side of the cowl, just under and behind the fender to cowl brace, and position the module to the side.
Remove the sound insulator retainer from the left upper most end of the dash insulator and carefully move the insulator to the side.
Approximately 76 mm (3 in) to the right of the stud for the sound insulator retainer, there is a small inward dimple in the dash. This is the pilot for the drill. Drill a 14 or 15 mm (37/64 or 19/32 in) hole through the dash panel.
Place a thin bead of sealer around the retainer, P/N 22573692 and insert the retainer into the dash panel.
Insert a pocket screwdriver into the center of the retainer to open the retainer.
Remove the instrument panel trim panel from around the IP cluster.
• For vehicles with an air bag selector switch, remove the accessory housing panel with the air bag selector switch and disconnect the wires from the air bag selector switch. Go to Step 10.

• For vehicles without the air bag selector switch, remove the IP bin from the center IP dash area. Insert one P/N 15040483 housing. Go to Step 10.

Remove the blank panel from the housing (if applicable) and install the switch and wire assembly, P/N 15174508.
To the short white wire from the switch, properly crimp and solder a terminal, P/N 12110844.
To the yellow, green and blue wires from the switch, properly crimp and solder a terminal, P/N 12084912.
Position a piece of mechanics wire into the back side of the dash in order to pull the wiring through the opening in the dash, routing the wires under the HVAC control and steering column.
Insert the three long wires through the previously installed dash pass through.
Pull the three wires completely through the dash pass through.
Seal the wires to the dash pass through with sealer.
Cut off a 1524 mm (5 ft) section of the wiring conduit.
Route the three wires into/through the conduit.
Position the conduit so it drops down from the dash pass through. Reposition the insulator blanket and reinstall its retainer.
Reposition the Throttle Actuator Module and install the retainers (If applicable).
Route the newly created wiring harness along the vehicle's existing wiring to the TCM area using 3 to 4 plastic tie straps to secure it in place.
Open the gray/clear TCM connector body cover.
• Insert the green wire into cavity 20.

• Insert the blue wire into cavity 12.

• Insert the yellow wire into cavity 28.

Properly close the TCM connector, re-connect the connectors to the TCM, reposition the TCM and install the TCM cover.
Locate the Relay Block-Body to the right and up from the parking brake mechanism. Inspect for a cream colored connector plugged into the Relay Block-Body, usually in the top right hand corner of the Relay Block-Body .
• If there is no cream colored connector in the Relay Block-Body, obtain P/N 15306105 and perform the following steps.

- Remove all terminals and wires from P/N 15036105 connector.

- Insert the white wire from the new switch assembly into cavity "E" of the connector.

- Place the connector into the top right hand corner of the Relay Block-Body.

• If there is a cream colored connector in the Relay Block-Body, perform the following steps.

- Disconnect the connector from the Relay Block-Body.

- Insert the white wire from the new switch assembly into cavity "E" of the connector.

- Reinstall the connector into the Relay Block-Body.

Use a couple of tie straps and tie the newly installed wiring to the underdash wiring.
Reinstall the IP trim bezel.
Reconnect both batteries.
Use normal SPS reprogramming procedures to reprogram the TCM.
Follow the procedure outlined in Corporate Bulletin Number 02-07-30-032 and complete the FastLearn procedure.
Reset the customer clock.
Road test the vehicle in the normal driving mode at 72 km/h (45 mph), 5th gear. When the speed is stable and road conditions are favorable, depress the newly installed 5th gear lockout switch. The LED should illuminate and the transmission should downshift to 4th gear. The transmission then should only have 1st, 2nd, 3rd, and 4th gear operation as long as the switch LED is illuminated.
Depressing the switch will allow 5th gear operation to resume. Fifth gear operation will also be reestablished any time that the key is cycled to the "OFF" position. This is normal.
Parts Information
Part Number
Description
Qty

15174508
Switch kit
1

12051375
Conduit
5 ft

12084912
Terminal (10 per package)
3

12110844
Terminal (10 per package)
1

22573692
Retainer (10 per package)
1

15306105
Connector
1

15040483
Housing
1*

15734687
Cover
1*


Parts with the (*) are required for Crew Cab type vehicles that do not have an air bag "On" or "Off" switch.

Parts are currently available from GMSPO.

Warranty Information
Addition of the 5th gear lockout switch is not a warrantable repair. The following information is a suggested repair guide only.

Labor Operation
Description
Labor Time

N/A
Install 5th gear inhibit switch
1.1 hrs

Add
Reprogram Transmission Control Module and perform FastLearn Procedure
0.7 hr

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
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Old 08-13-2008, 03:05 PM   #18 (permalink)
slaroque
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I tow a 15K 5ver and used to tow it with a 2003 LB7, now tow with a 2007 3500 LBZ dually, I just posted my experience in another thread.

https://www.dieselplace.com/forum/sho...d.php?t=260261

I had a 40HP tow tune in my 2003 and it helped but still left like a dog with that much weight. It was awesome with my 9K travel trailer, but the 15K 5ver was totally different.
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Last edited by slaroque; 08-13-2008 at 03:06 PM.
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Old 08-15-2008, 03:30 PM   #19 (permalink)
T.Myers
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It does need to breath better when pulling heavy! I used the K&N air filter just don't get carried away with filter oil. you'll be just fine... And I only notice the difference ( air filter, 4" pipe) when I pulled a big load. It helps just my 2 cents
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Gone: 2001 GMC LB7 D-max ext-cab 4x4 212,000miles edge w/***. 4" pipe, air box mod= BAD!!
1996 24' pontoon sweetwater (on the Mo. river every weekend)
2003 KFX400 not stock!
1978 24' Prowler 5th wheel it's not much but it's all we need
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