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Old 09-13-2018, 08:13 PM   #11
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Turbos will shine when towing, no matter which fuel you burn.
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Old 09-14-2018, 01:31 PM   #12
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OP is towing a pup??? I pulled a pup for 10 years when the kids were growing up with a straight 6 station wagon and a v6 in a Chevy Astro. This is not a problem with exceeding the trucks towing capacity. I'm not a mechanic but can confidently say that there is something wrong with the carb/injector, engine, or the tranny. He should be able to pull this pup up the hill without booging down.
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Old 09-14-2018, 01:55 PM   #13
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I would suspect a bad CAT. You might want to have a back pressure test done.
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Old 09-15-2018, 01:22 PM   #14
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I agree with DocBrown, based on information given.
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Old 09-16-2018, 04:30 PM   #15
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My guess is your Suburban as a 3.42:1 gear ratio which was the standard gear.

Optional was the 3.73:1 which is better for towing. The 3/4 ton has a more appropriate towing gear of 4.10:1

That is a very heavy truck with a 4 speed transmission. It is simply not up to the standards (HP, torque and gear multiplication) to tow loads "up steeper grades" quickly.
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Old 09-18-2018, 11:43 AM   #16
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take the truck out and run it without the trailer up a mountain hill I bet you have the same difficulty... as others have said .. slipping transmission, blocked cat, low compression... new motor should have things going well...
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Old 09-18-2018, 01:41 PM   #17
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As others have said, get the exhaust system checked for problems. Why was the engine replaced? Could oil contamination have 'strangled the CAT'?

My brother had a Mustang that just would NOT perform worth a DARN! It started ok and around town it ran ok it just very little performance. He fought with it for many months before he dropped the exhaust system. It was LOUD as all get out, but the beast really ran strong!

He found the muffler had failed internally, restricting the flow!
Who'd a thunk it!?
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Old 09-19-2018, 08:17 PM   #18
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What is up with people asking for help then never returning to their post whether it be to update or simply thank those that took time to offer assistance?
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