Home 9 Product 9 W900, T800, T600, T660 (Motor, Gasket, Shell)

W900, T800, T600, T660 (Motor, Gasket, Shell)


(2 customer reviews)

Stainless Steel Heater Box F31-1036ss1 fits 1987 and newer T400, T600, T660, T800, W900, (1984 – 1986 W900B) model trucks. Have questions? Call us at (616) 834-1503.


  • Stainless steel box;
  • Upgraded blower motor (15% increase in CFM over OEM);
  • Gasket Set;

SKU: F31-1036SS-1

The problem with the OEM Kenworth heater box assembly is that it is made of steel and easily rusts due to the salty, wet conditions that your truck experiences on a regular basis. What’s the solution? The solution is to use a far superior design made from stainless steel. Our heater boxes will never rust! Get yours today! Call now at (616) 834-1503 or click Add to Cart. We accept all credit cards!

We build our boxes with high-quality 18 gauge 304 stainless steel and use stainless steel fasteners. We spot weld our boxes for extra strength instead of using flimsy aluminum rivets like our competitors.


  • Stainless steel box
  • Upgraded blower motor included (15% increase of CFM compared to OEM)
  • Gasket kit
  • Other internal parts not included


Fits 1987 and newer T400, T600, T660, T800, W900 (Will also fit a 1984- 1986 W900B will require extra parts for the fresh air intake or the intake can be blocked off with our included block off kit.)

Additional information

Weight 25 lbs
Dimensions 20 × 15 × 20 in

Fits 1987 and newer T400, T600, T660, T800, W900 (1984 and newer W900B)




T400, T600, T660, T800, W900


1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022

2 reviews for W900, T800, T600, T660 (Motor, Gasket, Shell)

  1. Brian Colbert

    Awesome product works great fit perfect

  2. Chris Hanley

    Just put one in my ’06 T600. Difference is night and day, actually warm in my cab now….Best thing I’ve done to my truck so far

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