If you use the balljoints tie rod assys, & center link from the 86 you should be able to bolt the parts on the 70. the steer stops will be different on the 70 lower arms, & will shorten the turning radius(you can grind the stops on the spindles, or modify the stops on the arms).....or just replace the arms. 71-86 or 87 shared the same balljoints ,ect (on the 3/4 ton trucks). The corporate rears in the 20 series trucks generally had a 4.10, or 4.57 gear(my longhorn was 4.10), & had a 350sb/400turbo. 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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