If you are like most of us and drive mostly during warmer weather--yes get the bigger one. I prefer the plate design--I believe Summit has a 11X11X1.5 thick with 1/2 in. NPT female threads. May have to go online to find it. BMM-70274--29,200GVW. You will like this one.I have one and with the convertor locked @ summer cruise oil runs @ 120 degrees. Best of luck. I do have SOME experience with different types and designs of oil and trans coolers. BTW, this can be used for either.