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Q: transmission won't go past third gear on 1991 GMC Suburban 2500

transmission shifts through first, second & into third then stays in third. i am wondering if this could be related to towing. i have owned this vehicle for 170,000 out of it's 230,000 miles & only just recently towed a 2500 lb trailer of firewood. now suddenly i have a blown head gasket & transmission that won't go past third.
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