hello. have a chance to get a 8 3/4 this weekend and would like to know how to id if its a sure grip... thanks, andy.

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84 D100 /6 long rod 225
86 D100 /6 my sons w/offy intake/weber carb
2016 buick regal turbo

Turn an axle. If the other axle spins in the opposite direction it's not a Sure-Grip.

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Joshua

What Joshua Skinner said. If it's a sure-grip: with the rear wheels off the ground, if one rear wheel is turned the other rear wheel will turn in the same direction.

couldn't be any easier than that. thanks, andy.

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84 D100 /6 long rod 225
86 D100 /6 my sons w/offy intake/weber carb
2016 buick regal turbo

well, not a sure grip. another guy bought a 73 satellite w/o eng trans and some parts for 500 bucks. i could buy the 8.75 assembly from him. what would be a decent price. it looks pretty rough, probably need overhauled. or should i just put my money in the 8.25 in my 84 D100. thanks, andy.

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84 D100 /6 long rod 225
86 D100 /6 my sons w/offy intake/weber carb
2016 buick regal turbo

'73 Satellite could have an 8 3/4, but it's more likely an 8 1/4 if it was a 318 car. Also, they have the iso-clamp rear spring mounting which won't directly fit a pickup even if the pads are mounted in the proper location which they probably are not. The Satellite rear end is also about 1 3/8" narrower than your existing axle.

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Joshua