I have a 75 12bolt(1/2 ton diff) under my longhorn, & as far as width it fits fine. I dont think you will have any trouble with the prop valve, as the brakes are the same size. If you have coils, ther is a kit to install the later diff... http://www.classicperform.com/produc...ersion-Kit.htm good luck,crazyL
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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