Steering couple help

Hey guys, I'm having issues with my 49 Merc power steering conversion. I put in the Jeep Grand Cherokee power steering box (2004) and now I"m trying to figure out what to use to connect the stock shaft to that box. I am keeping the original column to keep the 3 on the tree shifting, but the coupler I got, a 3/4" DD ujoint, didn't fit on the jeep box and was too long to fit in the space I have.

So I'm thinking about using either a straight coupler or a rag joint. I'm still confused on what to get though since the 3/4" ujoint didnt' fit. I measured the jeep box and it's actually 18mm, smaller than the 3/4" I bought...

Has anybody done this conversion before? What joint did you use?

 

See if you can find a coupler from a jeep parts list and go from there. Ja a similar problem and had to buy 2 tag joints to make one.

 

Thanks for the response deto. I've tried to find a jeep part, but they all show a spline connector and mine is a DD shaft on the gear box. The universal I thought was going to work had 3/4" DD but didn't even fit on it. Apparently the box has some special dimension, I remember talking to somebody about this and I can't remember who it was.

I thought I had it all figured out but alas I was wrong. I'm figured I'd be able to fabricate something to work but don't even know where to start because it's such a vital part of the car I don't want it screwed up where I lose steering control driving down the freeway.

 

Lee Manufacturing Co. is who I got a coupler/rag joint and fittings from when I converted a '68 Camaro SAE (fraction) non-pwr steering system to a '92 Firebird WS6 metric pwr steering box. You may have to change your pitman arm to a ps pitman arm. I had to. Do a search here for Lee Manufacturing. I posted some info. Lee can probably steer you in the right direction.

Lee Manufacturing Co
Sun Valley, Ca
818-768-0371

 

There are 17mm DD and 18mm DD shaft sizes in the Borgeson catalog.

When I've spoken with them in the past they strongly recommend a rag joint or one of their 'vibration isolating U-joints' to filter out pump and hydraulic noises.