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Allison trans question

3415 Views 21 Replies 9 Participants Last post by  BoiseRob
I have a 2007 Classic CCLB SRW LBZ 3500 with a bit over 340k on the stock trans. I have been noticing a shudder/shaking and what seems to be very minor slipping when I pull off from a stop even when empty. This shaking stops when up to around 20 mph but it happens every time I accelerate from a stop. I checked the fluid and it is bright red, at the proper fill mark and doesn't smelled burnt. I am wondering if I should start considering a rebuild or replacement transmission. My truck doesn't have any mods other than a CAI and aftermarket wheels - never been tuned. It doesn't see any heavy towing, but I do pull a 7x16 enclosed toy hauler with my Harley or zero turn mower in it on short trips.

Any suggestions from the more experienced Duramax / Allison folks on easy fixes or should I start shopping for a trans?

I would like to be proactive on a fix and not have any unexpected down time / get stranded with the truck.
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She's just jealous 'cause you have a new "mistress". Just be sure you wrench on her as much as the truck and you should be fine.
Although we've been married for 34 years, I've told several of my friends if I disappear, check the back yard for freshly turned earth... lol
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