I'm needing a 400 Turbo trans yoke. The yoke I'm looking for doesn't have any splines from the very end to appox. 1" inward. In other words,the splines don't start @ the end,they start appox. 1" from the end. I haven't seen one in a while but I know they make them. I'm not sure if it was an Olds deal or not,so I'm unsure of the application. It's the short yoke, appox. 6" long total.

Thanks

Mike

 

Have you tried your local driveshaft guy? The guy I use has boxes of trans yokes. If you can't find one locally let me know and I will ask my guy to dig around.

Out of curiosity what do you need it for? I mean I know what a trans yoke is for, I mean why do you need one without spooned for the first inch?

Chris

 

We have a 68 442 Convertible that we're restoring for a guy. The drive shaft will not go into the trans far enough to get the drive shaft in the rear end yoke. The drive shaft is correct,the distance from the trans to the rear end yoke is correct. I called my buddy who built the trans and ran it by him. He says he's seen this before and it takes the yoke I'm looking for. The problem is the splines are bottoming out,not in the yoke but on the output shaft of the trans. The yoke I'm looking for allows the non spline'd part of the yoke to slide over the end of the output splines. He said this yoke is more common on Chevys but this is a BOPC trans. I do not know the history behind the trans,so it could have a Chevy output shaft.

 

I have a short yoke stuck in the back of my trans right now just to fill the hole until I put it back in the car. It slides in until the yoke itself is up against the seal lip. I know it's a spicer part. I will see if it has a number on it tonight.

Chris

 

Cut the yoke down on a horizontal band saw, and re bevel the front edge. You'll be done in 20 minutes.

 

When your buddy did the trans did he change the out put shaft or use a truck tranny by chance? I had this same problem, the truck out put shaft will bottom out sooner with the yoke, not allowing it it's full travel it's supposed to have. The out put shaft should have been machined for this; an easy way to tell if it is a truck out put shaft is if it has a threaded hole in the center, as trucks have a fixed bolted yolk. You should be able to slide the yolk about 7/8" to 1" worth of slack before it bolts to your rear end or else it'll bind your driveline. Don't cut your yolk, I ruined a brand new 90$ spicer before I found out all this

 

Statti is right about the truck shafts. Keep an eye out for compatibility.
If everything regular style and the yoke is just plain too long, I'd trim it.

Also, some bolt in styles will leak everywhere because of the hole.

Statti, how did the spicer yoke get ruined? People on here can learn from our mistakes.

 

It looks like a typical BOPC 400 turbo trans. If it was a truck trans it would be a Chevy bolt pattern,right? I do not know the history behind the trans,so the output could have been changed @ some point,my trans guy didn't change it. My understanding is that the 68's are tight on the drive shaft clearance anyway.The yoke has appox.4 3/8" of spline and the output shaft only has 3 7/8" of spline.I think that 1/2 " is where the problem is and if some body has a correct Olds 400 turbo they could ,measure the output shaft splines for me,that would confirm it. Thanks guys for the help.

Mike

 

Hey Mike

When you get it figured out, i have a bunch around. Let me know if you need one.


Josh

 

I cut mine too short and then did not have the proper amount of spine engaged. It technically still worked but would have ruined the tranny over time. Trucks had some trannies with the BOP as with the 350 diesel, also some shops will replace the output shaft for a truck in an existing BOP trans because they are plentifull

 

I cut mine too short and then did not have the proper amount of spine engaged. It technically still worked but would have ruined the tranny over time. Trucks had some trannies with the BOP as with the 350 diesel, also some shops will replace the output shaft for a truck one in an existing BOP trans because they are plentiful/ cheaper maybe ?

 

Also be careful about cutting off a yoke because the smooth outer surface also has to bear on the bushing in the tail housing.

 

Usually, but the GM trucks that got the Olds 350 diesel in the late 1970s used BOP transmission cases.

 

Yeah,I had forgot about those trucks. My trans guys says the way this output shaft works is,there's an O-ring just past the end of the splines that seals the trans. That's why the yoke doesn't have splines for the first 1" or so,that part slides over the o-ring. I'm pretty sure this is not an Olds trans but I gotta make it work with a yoke or back out it comes. I really appreciate all of the help from ya'll.

Mike

 

I have run across this before. most good drive shaft shops use the one with the splines all the way to the end like you have and then they cut the splines out about an inch in like the originals. they have done that for me a couple of time now.