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Pedal Smasher
1973 Opel GT
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Discussion Starter · #141 · (Edited)
I just bought a brand new slip yoke for my Getrag, coming from the UK...


The seller claims that this fits the Opel Getrag 240, I am looking forward to checking it. If it does fit, then the driveshaft (propshaft) from a 1975 to 1996 Jag XJ with a manual trans is a suitable option for the Getrag. I'm sure people can find these in junkyards, you can even just buy the driveshaft online. The Jag part number is CAC45602.

Here is a new XJS driveshaft. Someone could buy this and just have it cut in the exact spot needed, to have propshaft yoke from the GT welded in place. I'd check the spline count first before buying though, just to be safe.
 

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I just bought a brand new slip yoke for my Getrag, coming from the UK...
Interesting. Not really necessary, but interesting. Rumour has it that a Cadillac Catera (aka Opel Omega) uses the same slip yoke. More on that in a moment...

The slip yoke on a '70's Opel TH180 automatic driveshaft fits the Getrag 240 perfectly. So the easy solution is to find an auto driveshaft, take it to your local drive-line specialist (even Calgary has at least two of those) and get them to cut the body down to 9 3/4" weld-to-weld, balance it, and that is done.

In the event you can't find an auto driveshaft, call Opel GT Source, and they can get a driveshaft made by their favourite drive-line specialist, Drivelines NW in Tacoma WA. I have dealt directly with them, and they are very nice folks.

Spicer makes the correct slip yoke domestically. If you sweet-talk Gil, perhaps he will share the Spicer part number with you. Then take your 4-speed driveshaft to your local drive-line shop, get them to order the slip yoke, and build a Getrag 240 driveshaft.

HTH.
 
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Pedal Smasher
1973 Opel GT
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Discussion Starter · #143 · (Edited)
So the easy solution is to find an auto driveshaft
Not exactly easy anymore. OU might have them but even if they do, you still have a 50 year old driveshaft, that very well could have spent the last decade outside in a parts pile?


Spicer makes the correct slip yoke domestically. If you sweet-talk Gil, perhaps he will share the Spicer part number with you.
We have had how many threads discussing the issue of finding the correct slip yoke, and not once have I seen this. Why can’t the correct part number just be known? I’ll look into this and try to get that part number to share on here. There are a lot of Getrags waiting for installs if Charles’s imports are any indication.

Some will want OGTS to just provide them with a complete kit. I am not one of those, at least at this time. I plan to use some parts from Edelschmiede and I don’t think OGTS buys from them yet. For example, they make a Getrag support frame that bolts right up to a GT and a Getrag. Looks like a factory piece, not a hack job. I know some people just modify the stock support bracket. I want it to look like my GT always had a 5 speed.

So having part numbers for the slip yoke would be very helpful. The hoarding of knowledge just pisses me off. If it’s not proprietary knowledge that is fundamental to your business, then share it.

Your post was helpful Keith, so thank you.
 

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The Omega (and Catera) transmissions don't have slip yokes, they have Giubo joints.
Thanks, you are correct, I mispoke, as I didn't have my notes on hand. You are correct, the Omega/Catera isn't a donor.

Apparently the slip yoke from a 2002-2005 Cadillac CTS 5-speed will fit the Getrag 240 transmission. It is also used on the 2004 Holden (new GTO) and the early (1999-2001) Volvo C-70. This is what I have determined by looking up the Spicer part #, but I have not confirmed this first hand.

Gil provided me the Spicer slip yoke part # in confidence. He made it clear that he was doing me a favour, so that I could expedite getting a driveshaft modified locally for my Getrag, as he was out of stock and didn't have a good-condition driveshaft to send to Drivellines NW at the time. So I ordered a couple of transmission yokes from them, and had mine and Sterling Rempel's 4-speed driveshafts modifed locally.

While I have the Spicer part #, it is not "mine" to share without Gil's blessing. The research Gil did to determine that number IS proprietary and IS his "business". If he decides to share it, it is entirely his call.

On the topic of obtaining a Getrag 240, one of our Co-op members (who I am helping rebuild his excessively high compression, cam and lobe-washed 2.0) has been asking how best to get one. Charles is working diligently to bring them over from Poland, fully rebuilt by a Belgian (Jef Boite). But they are EXPENSIVE. And even more so when shipping to Canada is added.

I chatted with Gil and he has "requests" for 50 used Getrags. Wow. He actually has a line on perhaps 20 at present, subject to the joys of supply chain insanity.

But he has five Getrags that require rebuilding, and a shop to do so, which results in a more expensive purchase than a simple "used" Getrag. He has been waiting to have enough firm orders to take them in, as he only has one firm order in hand. Well, now two. So if a person is willing to pay a bit more, and still much less than Charles' option...

Sometimes a simple call to Gil can provide a lot of answers quickly.
 
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Pedal Smasher
1973 Opel GT
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Discussion Starter · #146 · (Edited)
Well, the slip yoke from a Jag XJ works perfectly.
Automotive tire Automotive exhaust Rim Bicycle part Automotive wheel system


It slid all the way in and the seal fits around it just how it should be. I need to find the U joint that fits this anyways, so I’ll work on identifying the Spicer part that matches this. I want to get away from the injected plastic U joints, so this is just the beginning of my driveshaft journey.

It's possible that one, or all, of the following slip yokes works for the Opel Getrag 240...




All 3 of these slip yokes appear to be pretty close in dimensions to the one I have and all 3 are stated as using a Spicer 1310 U joint. So that is the U joint I need to work with for a weld yoke. I'll also see if a 1310 U joint can be used with the prop shaft yoke. If it will work, then I don't have to worry about injected plastic U joints or reusing anything from the driveshaft in my GT.
 

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Well, the slip yoke from a Jag XJ works perfectly.
View attachment 444150

It slid all the way in and the seal fits around it just how it should be. I need to find the U joint that fits this anyways, so I’ll work on identifying the Spicer part that matches this. I want to get away from the injected plastic U joints, so this is just the beginning of my driveshaft journey.
I’ll be very interested in what you find. Those injected U joints are a PIA.
 

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Pedal Smasher
1973 Opel GT
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Discussion Starter · #148 ·
I’ll be very interested in what you find. Those injected U joints are a PIA.
Well, I already found 3 slip yokes that might work. They all have a 27 x 1.176" spline. The shape of that spline matters, since only the trapezoidal shape spline will work. You can't rely on any photos online, since they could be generic. Finding the exact part number on eBay could help, since people sometimes will post real photos instead. But, all 3 possible slip yokes use a 1310 U joint and their dimension match mine for some of it. So, that's the U joint I need. The closest slip yoke to what I have, from Spicer is 2-3-6081X. The center of joint to end of spline is just a tad less than mine. Mine measured at 5.5", which is what Strange U1661 has. But, I can't confirm the 1.176" spline for that since they don't list that dimension. Spicer 2-3-12411X, the other link at Jegs I posted, is a 1/4" longer than mine but I don't know if that would matter. Depends how much play there is when installing the driveshaft but I could see that resulting in a driveshaft not fitting if you built the driveshaft only off of known values and didn't check fitment.
 

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Pedal Smasher
1973 Opel GT
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Discussion Starter · #149 · (Edited)
So, the plot thickens. I started doing some measurements and realized that the slip yoke I have won't work with a 1310 u joint and I'm pretty sure a 1210 u joint is too small. It uses a narrower u joint with the same bearing diameter as the 1310 though. Funny enough, this slip yoke does look like it could use a u joint of similar size to the stock Opel ones. I compared it to the prop shaft end yoke and they might be able to use the same u joint. The other complexity to this now will be finding a suitable weld yoke. It might be possible though to reuse the weld yokes on the stock driveshaft, in which case this yoke would use 2 GT rear u joints.

In my research, I did find a Spicer end yoke that would probably fit our prop shafts and uses a 1210 u joint. The only problem is Spicer no longer makes 2-4-7221-1X. I'm going to keep working on this Jag slip yoke and see what will be needed to make a driveshaft with it. It's possible I might ultimately sell it however. I'm thinking about chasing down a Spicer slip yoke that uses a 1310 u joint, and have an end yoke made for the prop shaft. Then I can just use 1310 u joints for the whole driveshaft. Again, I really don't want to use the injected plastic u joints and would rather use snap rings.
 
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