McGuyver
09-27-2020, 09:06 PM
Starting to get some things done on my build. I picked up a 2014 Mustang rear end at a salvage yard. White GT with an auto 50k miles, car had a cold air intake and cat back exhaust w/stock rims and tires. All indications are this is a 3.15 ratio. Gear oil was clean and just a small amount of metal on the magnetic fill plug. I cut the unused brackets off, cleaned and painted. Replaced the upper control arm bushing, wheel bearings and seals. Filled with oil and sealed it up. But there is a little snag that puts off the install. Turns out my lower control arms are missing bushings so a call to F5 and they should be on the way.
So I walk past the differential and on a whim I put a piece of tape on the driveshaft flange to count off revolutions as I turned one of the hubs. One revolution, two revolutions, three revolutions, uh-oh, four revolutions, rear end is a 4.10! So my guess is Mustang owner had re-geared it, totaled it and put his stock tires back on it.
So moral of the story is don’t take their word for it, check the ratio before you buy. Just really glad I found out now. 4.10 is a little steep for me on the highway so I will call around and get some quotes on getting it re-geared.
So I walk past the differential and on a whim I put a piece of tape on the driveshaft flange to count off revolutions as I turned one of the hubs. One revolution, two revolutions, three revolutions, uh-oh, four revolutions, rear end is a 4.10! So my guess is Mustang owner had re-geared it, totaled it and put his stock tires back on it.
So moral of the story is don’t take their word for it, check the ratio before you buy. Just really glad I found out now. 4.10 is a little steep for me on the highway so I will call around and get some quotes on getting it re-geared.