ejnonamaker
Well-known member
- Joined
- Feb 18, 2016
- Messages
- 168
- Reaction score
- 2
- Location
- Colorado Springs, Colorado
- My Car
- 1973 Mach 1 351C 2v
Okay. It's cold, snowy, and windy here in Weirton, WV today. As I continue to piece together what I have and what I need I decided to lift the rear end of the car up today to see if I still had the 2.75 limited slip rear end. This is on a 73 Mach1, 351C 2V, FMX trans.
Here's what I found. For one full rotation of the tire I get about 1.4 of a rotation on the yoke for the driveshaft. So I dismissed this as original tires for this car where about a 205 and I have 225/70/14. I couldn't find a tag on the rear end. Not sure where to look honestly. Am I correct that this is a 2.75 rear end? I seems to me that it shouldn't be that far off or am I suppose to count a half rotation of the yoke and not a full rotation? I at least know it's limited slip.
So I'm also use to perhaps a newer style 9" rear end from the F-150's that have the drain plug on the bottom, a fill plug at the top, and a removable plate around the differential case that face the bumper. The only bolts on this rear end are on the forward side of it facing the driveshaft. I think that is correct. I'm guessing if I slide up underneath further I'd find that these are the bolts I need to undo to remove to drain the rear end fluid, change out the seal, and refill. I recall refilling a rear end once with a funnel and a long tube down the axle casing from inside the wheel well when I was a youngster around age 5-7 on a '67 or '70 Mustang.
Needless to say I'm probably all set up for great full economy and highway speeds. This car was originally shipped to Jacksonville, FL. So nothing but flat cruising down there. Especially with the 2V carb.
So the journey continues if I'm correct on all the above. Now it's a 2V to 4V intake, a 4V carb, long headers, mild cam, and upgrading the rear end to probably atleast a 3.5, maybe a little higher. I'm mostly looking to still get some good economy but what a little bit more umps off the line and highway speeds. This is just going to be a daily driver for weekend trips and cruising around town when it's done.
Since I have you all here. I'm use to working on newer cars where when you swap out a rear end you know need to change the shift points in an automatic transmission and recalibrate the speedo. I'm guessing this isn't something that is needed on our 71-73's except changing out the gear on the speedo cable.
Thanks!
Here's what I found. For one full rotation of the tire I get about 1.4 of a rotation on the yoke for the driveshaft. So I dismissed this as original tires for this car where about a 205 and I have 225/70/14. I couldn't find a tag on the rear end. Not sure where to look honestly. Am I correct that this is a 2.75 rear end? I seems to me that it shouldn't be that far off or am I suppose to count a half rotation of the yoke and not a full rotation? I at least know it's limited slip.
So I'm also use to perhaps a newer style 9" rear end from the F-150's that have the drain plug on the bottom, a fill plug at the top, and a removable plate around the differential case that face the bumper. The only bolts on this rear end are on the forward side of it facing the driveshaft. I think that is correct. I'm guessing if I slide up underneath further I'd find that these are the bolts I need to undo to remove to drain the rear end fluid, change out the seal, and refill. I recall refilling a rear end once with a funnel and a long tube down the axle casing from inside the wheel well when I was a youngster around age 5-7 on a '67 or '70 Mustang.
Needless to say I'm probably all set up for great full economy and highway speeds. This car was originally shipped to Jacksonville, FL. So nothing but flat cruising down there. Especially with the 2V carb.
So the journey continues if I'm correct on all the above. Now it's a 2V to 4V intake, a 4V carb, long headers, mild cam, and upgrading the rear end to probably atleast a 3.5, maybe a little higher. I'm mostly looking to still get some good economy but what a little bit more umps off the line and highway speeds. This is just going to be a daily driver for weekend trips and cruising around town when it's done.
Since I have you all here. I'm use to working on newer cars where when you swap out a rear end you know need to change the shift points in an automatic transmission and recalibrate the speedo. I'm guessing this isn't something that is needed on our 71-73's except changing out the gear on the speedo cable.
Thanks!