RPM Suburban Towing

1998 GMC Suburban K1500 5.7L 3.73 LT245/75R16M+S 50psi:

MPH 2nd 3rd OD

50 3200 2000 ----

55 3600 2200 1500

60 4000 2400 1700

65 4400 2600 1800

70 4800 2800 1900

75 ---- 3000 2100

Fun Finder loaded 2800# with Burb near GVWR of 7300#.