Hi All, I want to put a trac-lok unit in my rear. I was told they have a 28 spline, can anyone confirm that, also does anyone know if they had 2-7/8 or the lg 3-1/16 carrier bearings. I would like to order one but not going to put in until the spring. The car is put away for winter, so I am unable to pull apart to actually see what I have. Thanks for any information. Tommy"
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59 t-bird differential
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1959 differential
Hi cdhowel, I'm not original owner so you are correct it could have been changed. I did check ratio with code and that was right on. Now it does have the 3 chamfered holes on outside of axle, I know that 67 & up that's a 31 and axle with center cut out is 28, but I have been told that it doesn't apply to before 67 and that 59 bird stock is 28. I just didn't want to pull it out of winter storage and pull axle. It all looks original but as you said over the years anything is possible. Thanks for your help Tommy"Comment
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I was hopeful too that I had 31-spline axles because of the markings on the outboard ends of the axles, but when I pulled them they were 28-spline items.Comment
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1959 differential
Hi Dakota, did you also have the three chamfered holes. Does anyone know if they ever had 31 spline stock. Everyone I have spoke to said they are 28 spline and small bearing. Tommy"Comment
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info
The Mustang guys have put up some very usefull history and info on the Ford 9in. Look up kevinstang and ultrastang 9 inch. They answer a lot of the questions about the different 9 in and how to ID them. Interesting the 1960 Bird had the big bearing rear end. The easy way to identify the bearing size is by the size of the bolts holding the axle retainer.Grant
NCbird on the Coast of NC
"Dads Bird" for my fatherComment
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28-spline axles on my '58. Axle bearings are the larger-diameter units; 3.1496" OD (I just checked my notes). When I changed my gear ratio a couple yrs ago, I had pulled out the axles and replaced those bearings and the oil seals.Attached FilesComment
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1959 differential
Hi Dakota, mine looks identical to pic shown, so even though you have lg outer bearing you still have 28 spline. How about your carrier bearings were they small or the lg. Thanks Tommy"Comment
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1959 differential
The Mustang guys have put up some very usefull history and info on the Ford 9in. Look up kevinstang and ultrastang 9 inch. They answer a lot of the questions about the different 9 in and how to ID them. Interesting the 1960 Bird had the big bearing rear end. The easy way to identify the bearing size is by the size of the bolts holding the axle retainer.Comment
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According to the Master Parts Catalog it's 28 splines. Looks like they didn't go to 31 splines until 1963-64.
JohnJohn Pizzi - Squarebirds Administrator
Thunderbird Registry #36223
jopizz@squarebirds.org 856-779-9695
https://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htmComment
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1959 differential
Yea John, that's what I've been waiting to hear. One more thing not as important to me as spline count but are the carrier bearings small or lg. I would think small with 28 spline. Thanks John. Tommy"Comment
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The book shows 3 1/16 I.D. large bearing carrier.
JohnJohn Pizzi - Squarebirds Administrator
Thunderbird Registry #36223
jopizz@squarebirds.org 856-779-9695
https://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htmComment
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1959 differential
WOW" I thought for sure small bearing. John by any chance do they show a part#. I think I will order the 28 spline trac-lok and order the lg bearings and if by chance it's the small if mine look ok I'll try and gently remove and use them. So lg outer bearings, lg carrier bearings and 28 spline. Is that all 58-60 or is 60 all by itself. John thanks for taking the time to dig up some of the mystery info on early 9" differentials. Tommy"Comment
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Original part #B7A-4221-B. Of course the replacement parts will have their own part number. It shows the same for 58-60.
JohnJohn Pizzi - Squarebirds Administrator
Thunderbird Registry #36223
jopizz@squarebirds.org 856-779-9695
https://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htmComment
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