I had a 12 Chevy 5.3 and it was rated 315HP. I believe the 14/15 5.3 is rated 340HP. I had a 2000 GMC 4.8 and I believe it was 270HP. My 12 chevy transmission did a lot of hunting pulling my Whitehawk 27DSRL so I upgraded. My 4.8 GMC was a great truck/engine. Never had a problem with it. I sold it with 186,000 miles on it. Ithink you'll be fine if your not having trouble with it now.
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2015 Jayco 27DSRL (Sold and shopping for new 5er)
2016 Little Guy CIRRUS 800 Truck Camper
2015 GMC SLT 3500 Duramax Crew Cab, SRW
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