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Message: [QUOTE="LakeBum, post: 1518564, member: 29126"] I've got a stock injector truck (SXE turbo) with 3.73s and 35s. In third gear at 61 MPH Im turning 2200 RPMs. POWER and EGTS are GREAT. If I shift to 4th, RPMs fall to 1750 and about 68 MPH. IMHO this is to fast of speed for what I feel comfortable towing at. But the truck will do it and pull to 75 MPH as RPMs rise. Again EGTs are not a problem. I'd like to get a smaller tire to raise my 4th gear RPMs so I can use 4th for most things and then 3rd when I really need to pull a grade. Question is what RPM is safe for towing with PMRs. Stock tires and gearing would be 1830 RPMs at 65 MPH. is 1800-1900 safe towing heavy with PMRs? [/QUOTE]

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