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Discussion Starter · #1 ·
Hey all! I just bought and rebuilt the front end of a wrecked 2005 Silverado, that sure looks like it's had a ton of money put into it. (No Pics yet, but I'll get them in soon). I've never driven an Allison before, but it seems like it's got a Jake Brake on when in a parking lot going slow. I'm trying to find all info on whatever mods were done to it, could there be a Tranny reprogram that is making it feel like this? Or is it natural? I guess I'll need to find someone with a programmer to find out if its been reprogrammed for power or towing? Any tips would help. I love the power and look. I also think I want to lower it some, as the 6" seems to be a little tall for the Cabover Camper I carry. Haven't taken it on mountain roads yet, but I'm just concerned about stability.
 

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Congrats! Sounds normal. It does it more if the tow haul mode is on.
 

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:nopics:
 

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Discussion Starter · #4 · (Edited)


Here's the before pic.

p.s. I drove it to the body shop like this, still ran great!
 

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I`m new to the Duramax`s but after switching from a 1/2 ton truck with 4L60E and a 5.3 I can tell you the Allison is tight in the low gears so it feels like a jake brake or like its a standard when you lift off the pedal and really noticeable in reverse... It takes a little getting used to but sure works good for the wife to drive it... :D (nice and slow in ****@zz gear)
 
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