Rear Diff Ratio Question
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FTE Legend
Joined: Aug 2004
Posts: 37,887
Likes: 20
From: North Central Rural Sask.
Oh Im just going to pick up a old bronco I bought from a relative, this weekend. The rear diff in it is supposedly busted or broken, or non working in some way or another, and was thinking I would like to find one to throw in there.
I got the whole thing for really cheap, and its not a super duper favorite vehicle of mine, but it does run supposedly pretty good and whatnot, so i figure I may try to find a diff for the time being and burn around my farm with it.
I have a 77 parts truck with a 3.00:1 (I think) diff in it, and was just wondering what was common with the broncos so I could start looking a little.
I may also trade it off on a snowmobile haha.
I got the whole thing for really cheap, and its not a super duper favorite vehicle of mine, but it does run supposedly pretty good and whatnot, so i figure I may try to find a diff for the time being and burn around my farm with it.
I have a 77 parts truck with a 3.00:1 (I think) diff in it, and was just wondering what was common with the broncos so I could start looking a little.
I may also trade it off on a snowmobile haha.
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FTE Legend
Joined: Aug 2004
Posts: 37,887
Likes: 20
From: North Central Rural Sask.
I would most likely find the whole diff, but yeah I could do that too.
Do you know if there are any markings or numbers on the diff anywhere that would identify the ratio, or do you think a guy would have to do the revolution test to figure it out? (not like thats hard lol but im just thinking if its busted and doesnt turn the driveshaft...)
Do you know if there are any markings or numbers on the diff anywhere that would identify the ratio, or do you think a guy would have to do the revolution test to figure it out? (not like thats hard lol but im just thinking if its busted and doesnt turn the driveshaft...)
Elder User
Joined: Mar 2004
Posts: 759
Likes: 1
From: mohave valley, arizona
agree, replacing the third member is much easier and faster. in that case you can count the teeth on the old unit you take out. youll want to match it so the front and rear are matched.
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
there should also be a tag on one of the center section bolts giving you ratio info. if not just do what Hotrod said.
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Senior User
Joined: Jan 2006
Posts: 292
Likes: 3
Be shure to get the right splines in the axle side gears . 78-79 Broncos had 31 spline axles in them . Not all 9 inch had 31 spline, a lot had 28 spline axles.
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