12 bolt yoke
 

Can you tell me what needs to be done to a 12 bolt OEM yoke to put a logger sensor on it?

Re: 12 bolt yoke
 

i think the only tone ring you can buy are for 9", i glued my magnets to the ujoint caps

Re: 12 bolt yoke
 

Get a mark williams yoke.....joking.On the stock one I removed the dust ring in front of the seal and had to do some minor grinding ,computech had the appropriate sensor ring and your off to the races

Re: 12 bolt yoke
 

Thanks for the info, I have a ring from Racepak and I would like to not have to take the yoke off the rear to install it.

Re: 12 bolt yoke
 

if your careful you can do the modification to the yoke on the car ,I did it on the car for the same reasons

Re: 12 bolt yoke
 

What did you use to grind? A sharp flat file, Dremel, or a die grinder maybe? I'm thinking I have to pretty precise to keep the collar true.

Re: 12 bolt yoke
 

Believe it or not an electric grinder and a fine touch. all that has to happen is the four square corners need to be rounded out equally and a lot of grind, fit, grind, fit, etc.

Re: 12 bolt yoke
 

Dion, your collar must have been a different width as I couldn't find a way to fit the racepac collar on my yoke without a lot of interference. Mark Williams didn't make a 12 bolt yoke with the clearance machined and woudn't make one. So I had strange machine a chromemoly yoke. Looked cool, and so did the blue print . I made a mount to bolt onto the center section webbing to mount the pickup.
But then, maybe your are just that much more accurate with a grinder than I am .

Re: 12 bolt yoke
 

I have a Mark Williams yoke ( for 1350 u joints) and a 12 bolt and the collar bolted right up. I don't remember the part number, but it was an off the shelf item.

Re: 12 bolt yoke
 

Mike I use a computech datalogger and possibly the collar for the yoke is narrower as it didnt take much grinding to get it to fit. I now have a Mark Williams 1350 yoke and the collar just fit right up no mods neccessary. Also my job includes a lot of power tools and precision contol :)

Re: 12 bolt yoke
 

A 12 bolt walks into a bar....

Re: 12 bolt yoke
 

I have a Mark Williams 1350 on my car, had to cut off the flange of the seal to get my race pack collar to clear. It's close but no interference.

Re: 12 bolt yoke
 

It sounds like I want to find the thinnest collar I can. Mine is 3/16 thick. I'd hate to machine the OEM yoke and make it weaker in the process. Plus that would mean taking it off the rear, which I'm trying to avoid. Thanks for the input guys.

Re: 12 bolt yoke
 

I searched for a Yoke with the most clearance. Made Sure I had room to slip the D Shaft that much further into the trans. Then took both to a machine shop had the Race Pak Collar Machined with interference to fit the yoke. Fabricated the sensor holder. Went together fine. Getting sensor to collar clearance was critical on mine to get accurate readings. Once I got that right has worked great for years. The yoke I used I found on the internet it was not a strange or MW sorry cant remember name but TD comes to mine. I also used a internal Pinion seal meaning no exterior flange I ended up with about .060 clearance.

Hope this helps
Don

Re: 12 bolt yoke
 

any reason you cant use a sensor collar on the slip yoke by the trans--- that would bypass the whole space problem at the rear pinion yoke wouldn't it???

Re: 12 bolt yoke
 

I've often wondered why this isn't done. "I must be missing something" is what I always come up with. Hopefully someone here will tell me what that is.

Re: 12 bolt yoke
 

this is a RPM pick up correct??? If so most Liberty transmissions pick up the RPM from the input shaft in the trans underneath the bearing retainer ----so I do not see where this should be a problem for you--all you are measuring is rear wheel speed AFTER the trans ---the difference between the rear speed and engine rpm will give you your trans slippage as well as tire slippage---look into it --FED387

Re: 12 bolt yoke
 

My guess is the slip yoke moving in and out where as the sensor bracket would be fixed. Can't see how this would be good for proper sensor operation when the magnets would move front to back past the sensor.

I had a Denny's Driveshaft billet yoke on my 12 bolt. It had an undercut area between the seal and universal joint. I machined the magnetic collar inside diameter with a chamfer/radius on each side so it could sit on that undercut/radius area. Worked perfect. Plenty of room between the U-bolt nuts and the pinion seal.

Used an Autometer 4 magnet ring.

Don't remember if this was the exact one, but close.

http://www.dennysdriveshaft.com/p40_...rdw.html#photo

Re: 12 bolt yoke
 

We put ours on the tranny slip yoke , works fine. ---Trevor

Re: 12 bolt yoke
 

When I had asked computech about the output shaft sensor location they said it could be done but wasnt reccommended as the slip joint does just that, slipping in and out. the movement may be minimal but could cause some issues with the sensors picking up the signal. fwiw.

Re: 12 bolt yoke
 

Our's is a F body torque arm solidly mounted so there is virtualy no movement. --- Trevor