GM Diesel Trucks & SUVs 

All images and text are property of this website, photographer and/or author and protected by Copyright.
Website designed to be viewed with Microsoft Internet Explorer Version 4.x or better at 800x600 screen resolution
This site is in no way officially connected with General Motors, Chevrolet or GMC.
Legal Disclaimer for info regarding this website and ordering, by reading this website and/or ordering you agree to all terms setforth therein.



Pictures of our 6.5TD truck

Performance Data



Scroll Down for Duramax info & items

  Products for 
  the GM 6.5TD 

6.5 PDC: Pump Driver Cooler

6.5 PMD / FSD Remote Harness


6.5 Dash Mounted Adjustable FUEL Control

Transmission Control 4L80E

All Hi-Flow Air Filters

6.5 TD Performance Cool Air Intake



6.5 TD Turbo Downpipe

Performance EXHAUST Systems


Mist Injection

Fan Clutch


6.5 TD Intercooler

Dual Auxiliary Electric Cooling Fans

6.5 Hi-Flow Dual Thermostat Cooling Upgrade


6.5 Oil Cooler Hoses/Lines
NOTICE and Upgrade parts


Serious POWER:

PROPANE Injection



6.5 Gear-Drive
Timing Set


6.5 Pistons, Low Compression, ADVICE


Headlight Light Switch Saver and Light Intensifier 

Oil Pressure Switch Saver

 Ignition Switch Saver 


6.5 Stock Airbox

6.5 Stock Exhaust 


  Products for  
  the Duramax  

Duramax 6600 Performance 

Cool Air intake

Power Box

Performance Exhaust


The Magnus-Moss Warranty Act ______________

GM 2001 HD Silverado / Sierra Power Launch Tour

SEMA 2000 Show LV NV


SCARAB Offshore Powerboat

1979 Pontiac Limited Special Edition Trans-Am





WARNING: Aftermarket Fan Clutch

 There is a product being marketed; a fan clutch for the GM diesels that engages earlier, what this person and his 'salesmen' at the various discussion groups do not tell you is that by doing so will add a lot more load on the water pump and put added strain on the engine as it keeps the fan running longer than GM intended, this also will use a lot more fuel as the added drag on the engine from running the fan longer. 

 Besides wasting fuel and straining the engine, this also robs a lot of power, it takes a lot of HP to turn that fan and the last thing most of us want is to lose power on a grade when the engine needs all it can muster to get up the hill, but most importantly the added stresses on the water pump shaft could result in breakage.
 Having built many high powered engines for many types of vehicles over the years, and ones that have pushed the limits, I have seen firsthand what a fan can do to a radiator and other parts when a water pump shaft breaks and the fan goes flying forward, and let me tell you it isn't pretty, and the aluminum radiator for the GM diesels are very expensive.

 So one improper fan clutch could cost you a new water pump, radiator, belt, pulley and maybe even an ac condenser, or worst yet a new engine!  Oh yeah and a fan and another new fan clutch... hopefully then the choice would be a normal GM version properly designed for your engine.

 The revised in 1997 fan clutch # 15022302 and last time I checked Full GM retail price was only $99.56 and wholesale is less still, and most of us know how high GM part prices are. Quite often aftermarket fan clutches are only about $30. Frankly this aftermarket early on fan clutch at it's supposed "discounted price" is $250, in my opinion it's a huge RIPOFF.

 A high-priced fan clutch that comes on sooner is a waste of money on something that can create more problems than it can solve.

 NOTE: IF a person really needed to make the fan come on earlier, that can be done by simply adjusting the thermostatic spring on the front of the clutch, so no need for a new high priced fan clutch. But again you really should NOT want it to come on sooner.

Recap: on why a fan clutch that starts early is not advisable:
1) Added stress and strain on the water pump
2) Added stress and strain on the engine
3) Reduces power from the engine
4) Reduces fuel economy
5) MUCH higher price than GM replacement
6) Can do more harm than good

 My advice, stay with the stock fan clutch, if that is not operating properly, then replace with genuine GM parts. Always remember before buying any parts to "fix" a problem, especially one you did not have before is to check everything thoroughly first. If you have a cooling problem like a plugged or dirty radiator then; no fan clutch or electric fans will fix that, just delaying the problem to where it may become more serious. 

 Proper cooling system maintenance is key, flush cooling system and I recommend removing the radiator to do so, if it has build up then have a profession radiator shop do the job, once that is up to speed than test the fan clutch.
Then and only then, if you still have a high temperature problem like I noticed when my truck was new the first time I towed my boat, what I did was come up with some special electric fans to supplement the stock fan, this worked very well for me. We do not currently sell the electric fans, despite many inquires, first because the manufacturer's in order to make them to our specs want want us to buy far too many in order for us to get them at a cost we feel our customers would find reasonable, perhaps that will change.
I have noticed when running our water-mist-injection mainly for air charge cooling, but IMHO better than an intercooler that I have NO need for cooling upgrades or the added electric fans.

 I hope that this notice will help people before they fall victim to an aftermarket fan clutch that can cause more harm than good. <

Pictures of the truck     Performance Data   
  Boost Control    Fuel Control  Transmission Control
  PMD / FSD Remote Harness   PDC: Pump Driver Cooler  
Performance Cool Air Intake  High-Performance EXHAUST System
Water Injection    PROPANE Injection    NITROUS OXIDE Injection
  Dual Auxiliary Electric Cooling Fans   Hi-Flow Dual Thermostat Cooling Upgrade
Oil Cooler Lines, Hose Upgrades    
Transmission Power Relay System   Headlight Relay and Light Intensifier  
  Fuel Lift Pump Relay System 

Downpipe   Converter Test-Pipe 
Stock Exhaust  Stock Airbox

GM 2001 HD Silverado / Sierra Power Launch   SEMA 2000 Show, Las Vegas, NV 
SCARAB Offshore Powerboat    1979 Pontiac Limited Special Edition Trans-Am LINKS     Hummers at a local dealer


All images and text are property of this website, photographer and/or author and protected by Copyright.  

  Official PayPal Seal  PayPal Verified 

Disclaimer: Some products can adjust and/or increase power levels beyond factory parameters, so their use could possibly void your warranty, and may not be legal for use on emission controlled vehicles in some areas, due to these facts buyer accepts all responsibility for use, and his/her actions, there is no warranty either expressed or implied as to use of products, improper installation, settings and/or use of such could possibly cause property damage and or personal injury.  The Magnus-Moss Warranty Act prohibits a dealer or manufacturer from voiding your warranty unless a product is directly responsible for a failure.  Although effort has been made to try to present accurate information this website, it can contain some opinion, conjecture, errors, mistakes and typos so use any information with that in mind and if in doubt research anything you do not understand or question.  There is no guarantee or warranty on information on this website or any others it links to and visitors agree to hold authors, page owners internet service providers and web hosts free from any liability arising from use of information provided. Prices subject to change without notice.

Send mail to with questions or comments about this web site.
Copyright 2000 IAEI
Last modified: June 01, 2002