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Old Aug 23, 2007 | 09:58 PM
  #21  
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I've been looking on google ever since my first post.
You can call Denny's Driveshafts. You need a counterbored 32 spline th400 slip yoke.
It should be a 1330 but they don't list one, you might need a crossover u-joint.
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Old Aug 23, 2007 | 09:59 PM
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Originally Posted by 8a8mfh
I've been looking on google ever since my first post.
You can call Denny's Driveshafts. You need a counterbored 32 spline th400 slip yoke.
It should be a 1330 but they don't list one, you might need a crossover u-joint.
Thanks for the help what is a crossover u-joint? I see they have a threaded and non threaded output shaft listed on there website. Will a 1350 set of u joints fit on my stock driveshaft? I dont see anything about the counterbored slip yoke on there site maybe I have to call them and tell them that?
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Old Aug 23, 2007 | 10:13 PM
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Yes tell them what you're doing. A crossover u joint has, in your case, a 1350 to fit the yoke and a 1330 to fit the driveshaft. In other words one u joint has two different size caps.
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Old Aug 23, 2007 | 10:17 PM
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You need one for a threaded shaft.
Slip yoke is specifically designed to be used on a T-400 & 4L80 with the Threaded Output shaft. This design will replace the truck style bolt on yoke with a car style slip yoke and allow for proper slip travel and bushing contact for best performance. A must for any threaded output shaft on T-400 & 4L80 transmissions. We designed this yoke to solve this problem over 25 years ago
http://www.dennysdriveshaft.com/html/slip_yokes.html
Since no sponsors have stepped up to help...
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Old Aug 23, 2007 | 10:17 PM
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Originally Posted by 8a8mfh
Yes tell them what you're doing. A crossover u joint has, in your case, a 1350 to fit the yoke and a 1330 to fit the driveshaft. In other words one u joint has two different size caps.
Ok I guess ill try giving them a call sometime and seeing what they can do. So I need a counterbored type of slip yoke th400 style. Thanks for the help.
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Old Aug 24, 2007 | 10:46 AM
  #26  
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i called up denny's for mine and they were quick with correct info and got me the one i needed, mine is counterbored on the end.
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Old Aug 24, 2007 | 02:56 PM
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Ok cool I guess ill give them a call. Thanks.
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Old Aug 24, 2007 | 03:35 PM
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Why would you need counterbored? You're only going to get the contact that the splines provide anyway.
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Old Aug 24, 2007 | 04:47 PM
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Originally Posted by N4cer
Why would you need counterbored? You're only going to get the contact that the splines provide anyway.
They don't make them like this for nothing. All factory th400 cars have output shafts that look like the one pictured earlier in the thread, and they all have counterbored yokes.
You need the counterbore to allow the yoke to slide over the shoulder on the shaft to maintain the proper spline/tailhousing bushing engagement.
Some 4L80E's and a lot of 4x4 transfer cases use the same yoke but fully splined. They don't have the o-ring or the shoulder that the counterbore slides over.
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Old Aug 24, 2007 | 08:27 PM
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Originally Posted by 8a8mfh
They don't make them like this for nothing. All factory th400 cars have output shafts that look like the one pictured earlier in the thread, and they all have counterbored yokes.
You need the counterbore to allow the yoke to slide over the shoulder on the shaft to maintain the proper spline/tailhousing bushing engagement.
You have given some good info here,
the gentleman does need a counterbored yoke, Denny's can get it for him, it is the TH400 for threaded output shaft yoke.
You would think with all the high speed trans vendors on this site, they would know this.

However,
Not all TH400's have an output shaft like that.
The truck units that used a bolt on yoke have a similar output shaft, the Denny's slip yoke will work on both the TH400 and 4L80E. The TH400 bolt on yoke is too short to use on the 4L80E in a truck application.

The older passenger car TH400 shafts are splined slightly further up the shaft and don't use the o-ring as shown. They use a regular, non-counterbored yoke.

The TH400 truck shaft has a raised ring around the o-ring area that will cause a regular non-counterbored yoke to bottom out. Hence the need for the counterbored yoke on a retrofit application.
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Old Aug 24, 2007 | 08:52 PM
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Thanks for all the replies I guess ill call dennys driveshaft and tell them I need a counterbored slip yoke for a TH400.
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Old Aug 24, 2007 | 08:55 PM
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And when I get this slip yoke I slide it on the o ring right? Thanks for the info so far.
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Old Aug 25, 2007 | 12:31 AM
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Yep, It will slide in on the o-ring.
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Old Jan 20, 2009 | 09:21 PM
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I was wondering if i can use to stock slip yoke that came with my 80 and get a combination U-Joints 1330-1350 if im correct the 1330 is the stock camaro size and the 1350 is the size for a 01 3500 chevy work van. I also got the stock flex plate and converter off the van will it work with the camaro if so will i still need the spacer for the converter.
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Old Jan 21, 2009 | 10:20 PM
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t t t
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Old Jan 21, 2009 | 10:42 PM
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Post a pic of the outside and inside of your yoke and I'll help you out.
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Old Jan 21, 2009 | 10:46 PM
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Its at a friends house its the stock one that came out of it so i know it will work i want to know if the combination u-joint is a good idea
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Old Jan 21, 2009 | 10:54 PM
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If it's actually a slip yoke and not the bolt on type, you are fine. Get the proper conversion joint and go.
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Old Jan 22, 2009 | 08:29 AM
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The shaft has a threaded hole but I didn't half to unbolt it. Do you know if the stock flexplate and converter off a 01 3500 van this is what the 80 came out off will it work in my camaro without the spacer for the converter or are all the parts different? thanks Brandon
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Old Jan 22, 2009 | 08:40 AM
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Van parts will work, it will have the spacer already between the flexplate and converter, be sure and get the bolts....
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