8.8 rear swap in a wagon

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8.8 rear swap in a wagon Empty 8.8 rear swap in a wagon

Post by 74wagon on Fri Jan 11, 2019 1:03 pm

Hey all! So I've been looking in to a posi for my 74 malibu wagon only to now lear that they use an oddball 8.6" rear with no support. I was thinking a Ford 8.8" as I'm told its damn near a direct bolt in.

So, anyone done one? Or is there a easier cheaper option?

Thanks gang!

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Post by 73ss on Fri Jan 11, 2019 8:03 pm

I dont know what size ring gear they used in the wagons. I assume they use the 8.5. It is something other than that? I know GM used some odd-ball stuff in the full size line.

Just wondering if you are not confused with the newer 8.6. GM went to a 8.6 in the late 90's on the trucks. They are interchangeable with the 8.5. I rebuilt the 8.5 in my 73 last winter and used a Motive gear set. The instructions say 8.5/8.6. The gear set covered a span of 40 years. 8.5 will fit a 8.6 carrier and vice-versa. The gear set I have has a place on the pinion gear shaft to install the ABS sensor so it will work with the newer stuff. If that is the case, there is plenty of support for these units. My overhaul went well. Nice and quiet, no clunks, no noise.
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Post by Iggy on Tue Jan 15, 2019 11:57 am

The wagons received an oddball 8.75" rear end with a 10 bolt cut-out cover and a 12-bolt ring gear made by Cadillac (not the same as a Chevy 12 bolt). After market support for that axle does not exist!

The easy solution would be to replace with an 8.5" 10 bolt from a 73-77 coupe or sedan - that is a direct bolt in.
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