Up To $280 Off Select Tires | In Stock & Ready To Ship | Shop Now
The GT Diesel tuner unlocks more horsepower and torque to meet the unique demands you put on your vehicle. With shift-on-the-fly tuning*, customizable gauges to track performance, and better control of defueling and regeneration, you’ll be able to summon the low-end power to take on tough jobs or improve fuel economy for long highway hauls. Space for up to 10 custom tunes helps you adjust for the many ways you put your diesel to the test.
*Duramax LML and LGH are not shift on the fly. * This product is not legal for sale or use in California on pollution controlled motor vehicles
The on the fly mode is not working for anything newer than a 2006 and supposedly they have a née download that will fix the problem. According to 4 Wheel Part they do not sell many of these and don’t know anything about them. That’s what I was told after it was installed by the 4 Wheel Part employees and I had to U Tube the product in the parking lot alone to figure out it was not working properly. Was very let down by Billy Dog and 4 Wheel Part. Bully Dog shouldn’t be selling a product that doesn’t work like it is supposed to and if 4 Wheel Part is going sell a product they should have someone who knows something about it and not just say “Instructions are in the box or maybe U Tube it but good luck with that.” I will never buy from Bully Dog or 4 Wheel Part again!
The bully dog disel is good for towing and fast acceleration but realy bad on disel. Performance wize is really good you can feel the horsepower as soon as you install ot.
The Bully Dog Diesel Gt Tuner "40420" has by far been my favorite programmer i have had the liberty of using on my truck. I have tried many different brands and the Gt really stands out. Not only did it give me a incredible power increase with 2-4 MPGs better but it also gave me all my necessary gauges needed to keep the truck safe. This tuner is very user friendly. The install could not have been easier just plugging into the diagnostic port and simply hitting install. Not only was the install easy but changing power levels was as easy as pushing up or down being able to go from TOW to EXTREME in seconds! I would highly recommend this product to anyone who is wanting a good overall programmer/tuner to really wake the truck up without causing any damage. Thanks Bully Dog!
Just purchased this programmer for my 06 duramax, very impressive power gains especially in extreme mode. This is the only programmer I have ever had so I dont know if there is anything better but I can break the tires loose at 45mph on dry pavement in extreme mode so I think thats good enough. I am getting 4 to 6 miles a gallon better than stock. The display shows you everything you need besides the exhaust temp but you can buy the sensors for that seperate.
put the triple dog GT on 03 dodge ram 3500 CTD, easy set up, one wire to fuse box! the hardest part was routing wires and trying to decide where i wanted to put it on the window... great power gains, as well as 1-2 mpg(19.9mpg) increase while turning 35s and speeds 70-75. the unit is a little small, about the size of my BB Curve, but not to small where its hard to read... driving coach is nice to have, makes good driving like a game. if you really follow the DC i would see mpg gains of prolly 3-4mpg maybe more... this is a must have prduct
It added 3 miles per gallon and added much needed horse power for pulling my camper.
Q: Does this make and model GT Tuner allow you to change your governor setting for 2013+ Dodge Diesels ? Your site says it does. I just installed the one I purchased from you and cant find that setting anywhere for my 2017 Ram Diesel. Answer this question
A: Unfortunately, for that particular application the Speed Limiter removal function is not available on the GT Diesel Tuner. Looks like they were not able to unlock those functions via that device. It is however available on our BDX handheld tuner (Part Number 40470).
Answered by Kelly from 4WP Corporate Headquarters on 12/15/2020
Q: I have a 2004F 350 with a 6.0 power stroke and manual transmission I have cold air intake 3 1/2 inch downpipe and 4 inch exhaust no catalytic converter with egr delete will this tuner work or do you recommend another one? Answer this question
A: Hey Mark, This is a great tuner, if you want to talk options Feel free to call into the sales line to place an order. If you live near a store you can set it up for in store pick up. Sales & Support Toll Free: 1-877-474-4821 Phone Sales (PT) Monday - Friday: 5 a.m. - 7 p.m. Saturday: 7 a.m. - 3 p.m. Sunday: 8 a.m. - 2 p.m.
Answered by Kelly from 4WP Corporate Headquarters on 11/18/2020
Q: Do you have to run a pyrometer with this? Answer this question
A: Hi Michael, Bully Dog Triple Dog GT Diesel Tuner - 40420 does not have a specific prerequisite of a pyrometer.
Answered by [email protected] on 12/05/2018
Q: do you have a mounting bracket 2004 chevy crew cab Answer this question
A: Thanks for the inquiry jim, the Bully Dog Triple Dog GT Diesel Tuner part # B/D40420 we have a pillar mount part # B/D33302 or RAM Mirror-Mate Mounting Kit for GT/WatchDog (GM vehicles Pt #B/D33600.
Answered by RK on 06/16/2015
Q: Hi I have a 2003 Ford f250 7.3 with auto trans. Currently I have a cold air intake, 4" straight pipe, TS 6 position switch, upgraded turbo, bully dog shift kit. Is this capatible with the switch, exhaust and everything else I have? Thanks Answer this question
A: Hello Jonny, Yes, the Bully Dog Triple Dog GT Diesel Tuner B/D40420 will work with your vehicle configuration. Thank you.
Answered by RK on 05/29/2015
Founded in 1998, Idaho-headquartered Bully Dog has become synonymous with powerful, economic tuning for 4x4s. When you�re looking for a high performance programmer to give horsepower and torque a jolt in your Jeep, Bully Dog has options. Additionally, the company carries cold air intakes and accessories like pod mounts and sensor docking stations. GT programmers for Jeeps offer multiple power settings and advanced gauge/monitoring abilities to maximize your fuel economy. Bully Dog makes modules for gas and diesel applications capable of diagnosing and tuning to keep your Jeep at the top of its game. Shop Bully Dog Now