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TimfmCT's avatar
TimfmCT
Explorer
Aug 12, 2015

Catalytic converters for 2005 workhorse with GMC 8.1 vortec

Our 2005 Tiffin Allegro has the GMC 8.1 on the workhorse chassis. It's got 58,000 miles on it. We've had it for 6 years. Last year we replaced the transmission cooler assembly (rusted out) this year w...
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Bird_Freak's avatar
Bird_Freak
Explorer II
Aug 12, 2015
I would go ahead and replace the mufflers with Monroe stainless ones and be done with it.
I'm trying to figure why you would have needed a oil pump with low mileage. WH rep that came to my shop during our brake issues told me the 8.1 would get as low as 3 to 6 psi idling while hot. I had a hard time with that one but he swore it was true.

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