Forum Discussion
Lowsuv
Sep 22, 2013Explorer
brother manning ,
you are incorrect on this particular point .
the 17.5 to 1 compression is what creates the braking .
my 2002 duramax / allison does not have a "jake brake " type feature .
I can tell you that I use the 17.5 to 1 engine compression to good use most of the time .
the allison 5 speed is pretty easy to shift down , once you get the hang of it , into any gear you need for braking .
A combination of the tow / haul feature , the tapping of the brake pedal , or manually shifting to 3rd, 2nd , 1st .
my previous rig was also a gm 2500 but with the 7400 Vortec 454 cubic inch gasser .
The engine braking works considerably better with the diesel .
the additional braking comes from the higher compression ratio and the 5 speed auto trans that the diesel has over the 4L80E that came on the 454 .
you are incorrect on this particular point .
the 17.5 to 1 compression is what creates the braking .
my 2002 duramax / allison does not have a "jake brake " type feature .
I can tell you that I use the 17.5 to 1 engine compression to good use most of the time .
the allison 5 speed is pretty easy to shift down , once you get the hang of it , into any gear you need for braking .
A combination of the tow / haul feature , the tapping of the brake pedal , or manually shifting to 3rd, 2nd , 1st .
my previous rig was also a gm 2500 but with the 7400 Vortec 454 cubic inch gasser .
The engine braking works considerably better with the diesel .
the additional braking comes from the higher compression ratio and the 5 speed auto trans that the diesel has over the 4L80E that came on the 454 .
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