C6 Shudder
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From: Niceville, FL.
C6 Shudder
'83 F350 with 460 and ~75k (hard) actual miles. C6 shudders at about 5 mph accelerating or decelerating. Otherwise, seems ok. Fluid was brown but didn't have burned odor. Changed fluid (including drained converter) and filter and added Lucas treatment. Didn't seem to help. What next? What causes shudder?
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Just the cooler built into the 4-row radiator. Transmission line to cooler has sending unit to underdash gauge and gauge has never shown hot since I've had the truck (~5 yrs.).
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C6 doesn't have a lockup torque converter to cause the typical shudder problem. A very low speed shudder might be caused by a driveshaft/pinion angle problem. If you have a 2 piece drive shaft are the shafts in phase?
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Used Dexron III, operators manual called for II but according to Castrol bottle label III supersedes II. Two piece drive shaft phasing is exactly as shown in Ford manual. U-joints and carrier bearings have no detectable slop and no clanks or other noises. I forgot to mention, there is an external trans. cooler in front of the radiator which I think was factory installed on all 460's. I have a trans. fliud temp. gauge which indicates no temp. problems. I'll get a new modulator valve and try it, although I've had previous Ford vehicles with bad modulator valves that didn't produce this symptom.
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