turbo 400 yoke

[65truckowner]

I am trying to put a turbo 400 in my 66. It had a turbo 350. The yoke on the 350 is smaller than the 400 and shorter. Can I cut the turbo 400 yoke shorter? If not I am going to have to move the engine forward 2.5 inches. Will this cause any problems. I would rather cut the yoke. Here are some pictures let me know what you think

[Straydog]

I had a m22 4spd trans in my 66 Chevelle that had a turbo 400 tail shaft. I had to cut mine back to where the splines just started and grind a chamfer at the end so it would go passed the seal and had no problems with it what so ever.

[Straydog]

Another answer to your problem would be to shorten your driveshaft. Both ways I would think would be easier than moving the engine forward IMO.

[vidman]

You can cut it. but what th400 is it. truck or car. It makes a difference. The truck trans have a bolt on yoke while the car 400 have the slip style. If you are putting a slip yoke on a truck output shaft you need to counter-bore it. you can check out Dennys drive shafts and look up spicer 2060108..

['65 chevy lover]

I'm putting a TH400 in my '65. It started out with a bolt on yoke but, the trans shop that rebuilt it said the output shaft was bad and, they replace it with a slip on type output shaft without having a yoke to give me so, I have to buy one. I spoke with Ft. Worth Gear & Axle and they said it would be possible to shorten a yoke to fit. Shouldn't be a problem. Hope it goes well!

[65truckowner]

I am not going to shorten the driveshaft that was the idea of moving the engine forward. Maybe I should just find a turbo 350 and that way everything would fit.

['65 chevy lover]

As already stated, it would be way easier to shorten the yoke than move the engine forward. I think you should be able to make the TH400 work by doing that instead of moving the engine forward or, changing the driveshaft. Consult with a competant driveshaft place to make sure.

[65truckowner]

Ok what would be the best way to cut it? I dont have a drive shaft place close to where I live. The truck was set up for the 350 which I dont have and had the 400 laying around so wanted to make it work if I could.

[Straydog]

I would use a band saw with a built in vice. Any metal shop should be able to do it.

['65 chevy lover]

As already stated, a bandsaw would most like likely be the best. Just make sure you dress up the end and chamfer it so it won't tear the seal.

[GRADYS Performance]

If your driveshaft is too long shortening the yoke will not work. You need to have at least 3/4" yoke travel before it bottoms out in the transmission. do both yokes take the same U-joint?

[WhippinSaw]

X2
Push the yoke all the way in till it bottoms out, mark it, pull it out 3/4 to 1 inch, this is were it should ride.

[65truckowner]

I have decided to just get a turbo 350 and go back with it. That way everything will work including the driveshaft and yoke I have now. Thanks for all the input

['65 chevy lover]

That will most likely be your cheapest way to go. However, If you change your mind, give the folks at Ft. Worth Gear and Axle a call ( No, I'm not a rep or employee of them). Their # is 817-717-6685. I was there today buying a yoke for my TH400. They have in stock a short yoke for a 1310 u-joint. The one I'm getting is a short yoke for 1350 u-joints. Price about $65.00. If you have a high HP engine, the TH400 is the best trans from what I've heard. You also might want to think about going with the 1350 u-joints if you don't already have them otherwise, the 1310 u-joints will work. Good luck to you my friend!

[ImpalaJim]

350 and 400 have different spline patterns I do believe.

[rideblue00]

I just put my DS together. My 400came from the factory with a slip yoke.

[MikeN]

I've been through this on my 69 Chevelle. I bought a TH400 which (unknown to me) had the truck type output shaft for a bolt-on yoke, not the car-type shaft with a slip-on yoke. A local driveshaft shop that I deal with shortened my standard TH400 slip yoke to work with the truck-type output shaft. They only charged me a few dollars, and it seemed to work fine, but I was never comfortable with a slip yoke that was so short. I eventually bought the special yoke noted above from Denny's Drivshaft, and it is an excellent piece that has withstood about 300 drag strip passes.

You'll also have to switch from a cable-operated downshift (TH350) to an electric solenoid type downshift when swapping to a TH400.