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Beauville 1991 57L 4L80E with code 68 slip fourth or TCC any suggestion?
Wiki User
∙ 12y ago
your distributor is bad(sloppy). you may not think or feel it is because the engine may run smoothly but if you put it on a scanner it will show. do not get one from the junkyard! get a new one. this will give you back OD. . .you can unplug the drac module(vss buffer) by computer and it will reset for 1 or 2 shift sequences then lose OD or 4th gear again. now you know one reason things went to distributorless ignitions. very common among 5.7/L480E combos including isuzu box trucks NPR W4 4000, with gm powertrain mentioned.
Wiki User
∙ 12y ago
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