75W90 vs 75W140
Trying to decide which weight gear oil to use. I see both 75W90 and 75W140 recommended. Any suggestions on one over the other?
1997 Thunderbird 4.6L LX (out of commission for now)
SCT XCAL 2 From Lonnie, 02 Mustang MAF and air box, Dynomax Cat Back Exhaust, Steeda U/D Pulleys, 70MM FRPP TB, Dual Piston Calipers, KVR Rotors, Alpine CD, Polk Speakers
1996 Thunderbird 4.6L LX Stock
1994 Thunderbird SC (Needs Work, for sale)
1996 Bronco XL - 2003 Escort ZX2 wrecked - 1996 Bronco XLT Sport
Project Car: 69 Lincoln Continental