KEV

First night on the forum and first post so here it goes. Hope this isn't a repeat question but the "has this question been asked already" button was broken. Anyway, just bought an 86' and it has a 460 in it with 4:11 gears. I NEED to swap those out to something around a 3:27 or 3:55 but I have no idea what size rear end I have. By some reading I would guess it's 8.8 but I need to be sure before I go ordering anything from Summit. Thanks in advance for any help.

Ranger04

It should be an 8.8 if it is stock.

dodge

could be a 9" if its a american big block bronco , best to get some numbers of the original center, i have most ratios in stock of 9" motive sets

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bigbronc

here how to find out. at least on my 87 it is it should be the same. if you have to open the diff and pull the c clips to take the axle out its a 8.8" if the axles unbolt and slide out by the hubs its a 9". so look at the hub to see it it comes out there toknow

Ford_rules

Why do you need a lower axle ratio? 4:10 is a good ratio!

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