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I believe the fox body rear is 59" axle flange to axle flange. The sn95 models are 3 inches wider.

Try 4:11 like I had in my 65 tempest w 14" tires. Made no difference with the stock engine or the big one I built. 3800rpm to run 70mph. You doing the right thing. I think the stock engine could Handel it. I don't use mine for a truck. That's what my 3/4 ton is for.

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75 Luv, 350 V8, TH350, Camaro rearend. New 1975 Luv Step side. Stock for now.
Grandmaster of the "Shade Tree" way.. I can't see the yard for all the cars. Come on down and we will sit on the porch and watch the grass grow.

Looked at the demensions on the 75, series4 truck and it shows 52" center of tire to center of tire.

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75 Luv, 350 V8, TH350, Camaro rearend. New 1975 Luv Step side. Stock for now.
Grandmaster of the "Shade Tree" way.. I can't see the yard for all the cars. Come on down and we will sit on the porch and watch the grass grow.

On 12 bolt and 10 too I think a series 2 carrier can use any 2:xx gear set. You will need to run a series 3 carrier to run any 3:xx gear set. And a series 4 carrier to run any 4:xx gear sets. Some one will correct me if I am wrong. It has been a zillion years since I had to deal with GM gear sets.

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75 Luv, 350 V8, TH350, Camaro rearend. New 1975 Luv Step side. Stock for now.
Grandmaster of the "Shade Tree" way.. I can't see the yard for all the cars. Come on down and we will sit on the porch and watch the grass grow.

You will need 2.5x-3.08 for 2 series 3.23-4.11 for 3 series and 4 series for 4.56 up