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Drive Shaft 28 spline to 31 spline?
#1
Hi I have a 4 spd toploader with a 28 spline output shaft. I want to put a trac lock differential in. I have found one with a 31 spline shaft. My current drive shaft is 28 on both ends. If I get the 31 differential will I need a new drive shaft or can I change some yokes? Or is it not possible to even change from 28 to 31?

'72 Mach 1
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#2
You change the yokes as long as the u-joints are the right size.

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
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#3
scoot302;37804 Wrote:Hi I have a 4 spd toploader with a 28 spline output shaft. I want to put a trac lock differential in. I have found one with a 31 spline shaft. My current drive shaft is 28 on both ends. If I get the 31 differential will I need a new drive shaft or can I change some yokes? Or is it not possible to even change from 28 to 31?

That rearend is total junk, so just send it over to me to keep you from using it.Tongue
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#4
Ah, At least give him a dollar big man! :P

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
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#5
It's possible! Just swap the yokes and you'll also need new 31 spline axle shafts.
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#6
scoot302;37804 Wrote:Hi I have a 4 spd toploader with a 28 spline output shaft. I want to put a trac lock differential in. I have found one with a 31 spline shaft. My current drive shaft is 28 on both ends. If I get the 31 differential will I need a new drive shaft or can I change some yokes? Or is it not possible to even change from 28 to 31?
I may not be understanding your question correctly but, unless you are building a VERY large amount of torque and using slicks, there is no need to change the main shaft (output shaft) in the transmission. See: http://www.davidkeetoploaders.com/idchart1.htm
Depending on what the 31 spline differential came out of you may need, change the yoke on the pinion or use a "combination u-joint" (1310 caps on one axis, 1330 caps on the other). See:http://www.dennysdriveshaft.com/c58_ford_9_inch.html
You will need 31 spline axles. See: http://www.strangeengineering.net/
I hope I understood the question. Chuck

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#7
Thank you that helps a lot. It seems like for my application it would be easier to just find a 28 spline trac lock so I don't have to dish out the cash for the new axles.

'72 Mach 1
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#8
scoot302;37885 Wrote:Thank you that helps a lot. It seems like for my application it would be easier to just find a 28 spline trac lock so I don't have to dish out the cash for the new axles.
Right on!
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#9
scoot302;37885 Wrote:Thank you that helps a lot. It seems like for my application it would be easier to just find a 28 spline trac lock so I don't have to dish out the cash for the new axles.
Almost anyone would be willing to trade a 28 spline TL for a 31 spline TL, including me. If you are not drag racing on slicks, or really sticky drag radials, the 28 spline TL should be fine. Also the cheapest. Just make sure you don't end up with the older style (pre mid 69 model year) Equa-Lok, much less robust set up. Chuck
Additional Info. http://www.kevinstang.com/Ninecase.htm
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#10
c9zx;37892 Wrote:
scoot302;37885 Wrote:Thank you that helps a lot. It seems like for my application it would be easier to just find a 28 spline trac lock so I don't have to dish out the cash for the new axles.
Almost anyone would be willing to trade a 28 spline TL for a 31 spline TL, including me. If you are not drag racing on slicks, or really sticky drag radials, the 28 spline TL should be fine. Also the cheapest. Just make sure you don't end up with the older style (pre mid 69 model year) Equa-Lok, much less robust set up. Chuck
Additional Info. http://www.kevinstang.com/Ninecase.htm

I didn't even know about the Equa lok set up. From the article it is indeed a Trac lok. Thanks again for the help.

'72 Mach 1
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