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just installed the chip and #9 resister in my 94 crew cab duley it took 30 minutes before my truck couldn't get out of its own way but now it can keep up and pass my 95 duley with a 454 big block I can't wait to see what it does to the mileage but even...
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From: brian w.
I recently purchased a 98 GMC 3500 with the 6.5L turbo. The first thing I did was replace the old PMD with a new SS Diesel FSD/PMD kit. Even though I wasn't having any major problems yet, everything I've read so far suggests that it WILL happen...
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From: Todd C.
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6.5TD C/K Trucks  >  Engines, Heads and Components  >  6.5TD HD Secondary Harmonic Balancer Assy (main pulley)

New HD Secondary Harmonic Balancer for all Serpentine belt drive 6.5's, all years.

6.5TD HD Secondary Harmonic Balancer Assy (main pulley)

6.5TD HD Secondary Harmonic Balancer Assy (main pulley)

Model: ssd-5231 $89.99 $79.99
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Brand New HD Secondary Harmonic Balancer for all 6.5's with serpentine belt drive, all years, all vehicles.

If you have a rattle in the front of your engine, it may be the Secondary Harmonic Balancer. Inspect and if loose or showing signs of separating, replace it immediately. Harmonic balancers fail over time and will cause a crankshaft to break. If you have ever heard of a crank breaking on a 6.5, it can always be traced back to a bad balancer, not a bad crank.

The Secondary Harmonic Balancer includes the pulley as part of the outer ring of the balancer.

Engines require a harmonic balancer to absorb the harmonic vibration created by the reciprocating motion of the pistons and rods and rotation of the crankshaft. It is located on the front end of the crankshaft and the belt drive pulley attaches to it. If defective, the crank vibration will fail the crankshaft causing catastrophic failure of your engine. This outer secondary balancer is usually what fails first from age and wear. Also check the main harmonic balancer behind this balancer and replace also, if it shows signs of wear or separation. Its available in this category as p/n ssd-5328

 

6.5TD HD Secondary Harmonic Balancer Assy (main pulley)

 

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