I have the 68 Ford CS with the Dana 4:10 rear. Has anyone went to higher gears in a Dana? Just would like to let up on the gas at 65 and not get the, I just put the breaks on feeling. I know the gear choice with this set up is limited, and I can't get all that high, but is the diff worth it? I am thinking 3:54 is as high as I can go. Talked to Driveline Service in Redding, and the tech said I would see about a 15% change with the 3:54 gears. Sound worth it?
May your sails stay full, and your knots not slip. Unless a slip knot.
Once I thought I was wrong, but I was wrong.
Life is a banquet, and every days a feast.
68 F-250 CS 390 C-6 P/S A/C front disc. 2nd owner.
2016 GMC Terrain Denali 301 HP V-6 AWD.
2009 Silverado Crew Cab, V-8, 4X4.
DD-727
DD-806
AE-35
LSD-39
AS-41
AR-8
I think you would have to change out the carrier. the 4:10 and 4:56 use one carrier and the 3;54 and 3;73ish use a different carrier. I would think you would notice a difference if you went from 4:10s to 3:73s so you would really notice a change from 4:10s to 3:50-somthings. do alot of hwy driving?
Rich
1973 f350 super c/s 460/c6 22k orig miles
1972 f350 srw crewcab special 390
1972 f250 4x4 sport custom 390fe Red
1972 f250 4x4 custom 360 FE " Ranger Ric"
1972 f250 4x4 custom 84k og miles 390
1971 f250 4x4 sport custom 56k og miles. 360
1970 f250 4x4 428 fe hp60 205 d60
Dont eat yellow snow.....
thanks for the reply 1972hiboy
80% is 50-60mph driving the rest is 70mph driving, so I may do it. The price I am told will be $900. to a high of $1600. Depending on whats what when the rear is opened up.
May your sails stay full, and your knots not slip. Unless a slip knot.
Once I thought I was wrong, but I was wrong.
Life is a banquet, and every days a feast.
68 F-250 CS 390 C-6 P/S A/C front disc. 2nd owner.
2016 GMC Terrain Denali 301 HP V-6 AWD.
2009 Silverado Crew Cab, V-8, 4X4.
DD-727
DD-806
AE-35
LSD-39
AS-41
AR-8
I know the gear choice with this set up is limited, and I can't get all that high, but is the diff worth it? 
I am thinking 3:54 is as high as I can go. Talked to Driveline Service in Redding, and the tech said I would see about a 15% change with the 3:54 gears. Sound worth it?
