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Old 06-29-2007, 03:26 PM
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74 DART SWINGER 74 DART SWINGER is offline
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Default 7 1/4 to 8 1/4 rear swap

This weekend i'm going to be switching out the 7 1/4 rear for 8 1/4. What will I need for this?
-u bolts
-shock plates
-shorter drive shaft
What else am I missing? Do any of the brake lines/hardware need to be changed also? I'll also be going from a 2.76 gear to a 3.21 SG unit(8 1/4),will i notice any difference in the gear change?
Thanks
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Old 06-29-2007, 04:28 PM
Andy Thomas Andy Thomas is offline
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I did this swap about 10 years ago. I think everything bolted up. All I did was have the driveshaft shortened.

Hope this helps,Andy
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Old 06-29-2007, 07:20 PM
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nhdriver nhdriver is offline
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Wink

You will need to change the drive gear (in the transmission)for the speedo. An easy job, after you get the correct one for your combo.
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Old 06-29-2007, 09:42 PM
dodger1 dodger1 is offline
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Did it in a Mirada. Shorter driveshaft and new speedo gear was all I had to do as the 8 1/4 came out of a F-J-M (cop) car. If your 8 1/4 came out of an A-body that should be all you need to do. If it's out of something else, you may need to move spring perches. Tape measure will tell you.
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