4l80e slip yoke
08-22-2007, 07:17 PM
#1
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4l80e slip yoke Got my trans back from being rebuilt and pulled the tailhousing off. Iam wondering what slip yoke I will need for this trans. Another member posted a picture of the same tailshaft as the one on my 4l80e in the 4l80e swap sticky. I did pm them but incase they dont respond or anything I figured id also make a post. Im still using the stock driveshaft and the writeup says 1330 series and I guess I will need to use the th400 slip yoke. So does anyone know where I can find this type of slip yoke to fit this trans? Thanks.
08-22-2007, 07:49 PM
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Originally Posted by cablebandit
that output shaft doesnt take a slip yoke...it takes a bolt on yoke. I would have that output shaft changed myself to a slip yoke shaft. You wont get much engagement with a slip yoke trimmed to fit that shaft
08-23-2007, 06:58 AM
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Originally Posted by N4cer
My slip yoke works just fine with that output shaft. I just ordered the spicer yoke from Summit, and measured where it needed to go. CUt it off and got a u-joint from the Spicer store (local).
Last edited by RamAir02TA77; 08-23-2007 at 07:20 AM.
08-23-2007, 08:37 AM
#6
SY1330 is the one I used. Not sure what o-ring you're talking about. I forget how we measured. I cut it to match the length of the splines. And it still sat my pinion angle way too low, so you should have an adjustable torque arm, or at least adjustable LCAs.
I just took the yoke and driveshaft to the driveline shop and had them get the right u-joint.
I just took the yoke and driveshaft to the driveline shop and had them get the right u-joint.
08-23-2007, 06:29 PM
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I was talking about the little o ring on the tail shaft right in front of the splines. But ill do what you said and cut it to match the length of the splines. I do have the umi tunnel mounted adjustable torque arm so I can adjust pinion angle. Btw I dont see the spicer yokes listed on summit racing maybe its this part number now RMG-SY1330. It is a 1330 series u joint which is the stock ls1 driveshaft series. So that should be the one I need and ill just cut it to match the length of the splines. I also have the old bolt in yoke that came with the trans and I could always match it to that size.
Originally Posted by N4cer
SY1330 is the one I used. Not sure what o-ring you're talking about. I forget how we measured. I cut it to match the length of the splines. And it still sat my pinion angle way too low, so you should have an adjustable torque arm, or at least adjustable LCAs.
I just took the yoke and driveshaft to the driveline shop and had them get the right u-joint.
I just took the yoke and driveshaft to the driveline shop and had them get the right u-joint.
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08-23-2007, 07:37 PM
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Originally Posted by N4cer
Yep that's the part number.
And mine doesn't have that o-ring on it from what I remember. I don't think it serves any purpose in our application.
And mine doesn't have that o-ring on it from what I remember. I don't think it serves any purpose in our application.
08-23-2007, 07:50 PM
#10
You need a th400 style yoke period. Every th400 output looks like that slip yoke or bolt on.
A real th400 slip yoke does not have splines up to the end, the ID is smooth for a few inches so it slips over the o ring and the shoulder.
There are slip yoke only 4L80E output shafts that have splines up to the rear bearing, with this type you can use a slip yoke with splines up to the end.
With what you have in the picture you need a th400 yoke, get the right one and you won't need to cut it.
Get the wrong one you might cut it to fit but it's not right.
A real th400 slip yoke does not have splines up to the end, the ID is smooth for a few inches so it slips over the o ring and the shoulder.
There are slip yoke only 4L80E output shafts that have splines up to the rear bearing, with this type you can use a slip yoke with splines up to the end.
With what you have in the picture you need a th400 yoke, get the right one and you won't need to cut it.
Get the wrong one you might cut it to fit but it's not right.
08-23-2007, 07:58 PM
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Originally Posted by 8a8mfh
You need a th400 style yoke period. Every th400 output looks like that slip yoke or bolt on.
A real th400 slip yoke does not have splines up to the end, the ID is smooth for a few inches so it slips over the o ring and the shoulder.
There are slip yoke only 4L80E output shafts that have splines up to the rear bearing, with this type you can use a slip yoke with splines up to the end.
With what you have in the picture you need a th400 yoke, get the right one and you won't need to cut it.
Get the wrong one you might cut it to fit but it's not right.
A real th400 slip yoke does not have splines up to the end, the ID is smooth for a few inches so it slips over the o ring and the shoulder.
There are slip yoke only 4L80E output shafts that have splines up to the rear bearing, with this type you can use a slip yoke with splines up to the end.
With what you have in the picture you need a th400 yoke, get the right one and you won't need to cut it.
Get the wrong one you might cut it to fit but it's not right.
08-23-2007, 08:21 PM
#12
I have had guy's do just as what was stated by 8a8mfh. Works just fine. I have built quite a few units using he same shaft that you have. Get the right yoke and you are good to go. 
Originally Posted by 8a8mfh
You need a th400 style yoke period. Every th400 output looks like that slip yoke or bolt on.
A real th400 slip yoke does not have splines up to the end, the ID is smooth for a few inches so it slips over the o ring and the shoulder.
There are slip yoke only 4L80E output shafts that have splines up to the rear bearing, with this type you can use a slip yoke with splines up to the end.
With what you have in the picture you need a th400 yoke, get the right one and you won't need to cut it.
Get the wrong one you might cut it to fit but it's not right.
A real th400 slip yoke does not have splines up to the end, the ID is smooth for a few inches so it slips over the o ring and the shoulder.
There are slip yoke only 4L80E output shafts that have splines up to the rear bearing, with this type you can use a slip yoke with splines up to the end.
With what you have in the picture you need a th400 yoke, get the right one and you won't need to cut it.
Get the wrong one you might cut it to fit but it's not right.
08-23-2007, 08:38 PM
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Originally Posted by Vince @ FLT
I have had guy's do just as what was stated by 8a8mfh. Works just fine. I have built quite a few units using he same shaft that you have. Get the right yoke and you are good to go. Last edited by RamAir02TA77; 08-23-2007 at 08:54 PM.
08-23-2007, 09:05 PM
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Originally Posted by N4cer
Yeah the problem is that the one I ordered IS listed as a TH400 slip yoke. But it was splined to the end. Now explain that.
08-23-2007, 09:05 PM
#16
Originally Posted by N4cer
Yeah the problem is that the one I ordered IS listed as a TH400 slip yoke. But it was splined to the end. Now explain that.
08-23-2007, 09:07 PM
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Originally Posted by 8a8mfh
Listed wrong.
08-23-2007, 09:34 PM
#19
The o-ring seals the yoke splines, theres a vent hole in the end of this type of yoke.
If you get a yoke with splines up to the end, the o-ring is useless, it will not engage the right amount, or it will engage too far.
I've seen cars with th400's and driveshafts too long break the trans case on a hard launch due to the driveshaft being too long and getting shoved into the trans and bottoming the splines out.
If you get a yoke with splines up to the end, the o-ring is useless, it will not engage the right amount, or it will engage too far.
I've seen cars with th400's and driveshafts too long break the trans case on a hard launch due to the driveshaft being too long and getting shoved into the trans and bottoming the splines out.
08-23-2007, 09:54 PM
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Originally Posted by 8a8mfh
The o-ring seals the yoke splines, theres a vent hole in the end of this type of yoke.
If you get a yoke with splines up to the end, the o-ring is useless, it will not engage the right amount, or it will engage too far.
I've seen cars with th400's and driveshafts too long break the trans case on a hard launch due to the driveshaft being too long and getting shoved into the trans and bottoming the splines out.
If you get a yoke with splines up to the end, the o-ring is useless, it will not engage the right amount, or it will engage too far.
I've seen cars with th400's and driveshafts too long break the trans case on a hard launch due to the driveshaft being too long and getting shoved into the trans and bottoming the splines out.
