Detroit 60 12.7 Jake brake compatibility

The adjustment is different for sure. I would think it would be best not to use them. Maybe try to call Jacobs but since it isn't listed you will probably get a no. I would not risk it myself but someone may post on here and tell you that they have used them. Here is the application guide. https://www.jacobsvehiclesystems.com/sites/default/files/2021-08/24770_DDC_App_Guide.pdf Notice the different gap setting. .813 vs .580

 

Is your 2003 a Pre Egr or Later egr engine. Alot of 2001 engines were pre-order and purchased for 2003 built trucks. Especially detroits in KW/Petes.

 

Sure does. YOU Certain you numbers are correct? DDC4 was in 2003 pre order trucks non egr. DDE5 was in 2004 calander year.


Now, I am no DDEC5 guy. But sounds to me your mixing generations with your description and only 2 position jake selection. Id be very careful mixing parts.

 

Why replace when they are simply rebuilt at home. However im betting they are 770 Jakes. 3 units, reliable and dependable.

 

Where are you located? I have several sets of jakes at the shop. We are in SC. I might have what you need.

 

As far as Bolting the dd5 jake to the dd4 will bolt on if you use all the bolts and spacers from the dd5 as far as working no ide plus what are you going to do with the 3rd wire letting it hang will give a cel