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Cadillac Repair/reassembly 89 barrtz

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Question
that 5/16 18=1 for steering shaft  on 89 barritz does not match thread pattern mor like 13 can you advise

Answer
Hello,

I believe you are trying Yonkers the upper shaft from walking up so you can instal the lock plate on a t&t column. I have rebuilt thousands of these.
Unless someone had used a tap on it changing the threads or who knows what and I have seen some real shoddy work on columns, you need a 5/16 18 x 1"Allen head cap screw. Push the shaft all the way down, tighten cap screw and put lock plate compressor on. Lock plate only fits one way as the c clip that holds the shaft together.
They columns were badtardized using metric and SAE. Of course the vehicles were like that.
Any way,1978 is when the shaft used a 13/16 head nut to hold the steering wheel. Before 1978 7/8 was used. However, the inside thread has always been the same. I stocked over 300 of these upper shafts, because when stolen, the steering wheel was forced, the shaft and lock plate would strip, also breaking the upper bowl because the lock pin would be force in the column. You would see a big crack on the top of the steering column. Tilts had issues too, but didn't have the side to side slop in the steering wheel.
As I said, I do not know why you are having trouble, and you may want to just run a tap down the shaft, the only size I have known it to be I 5/16 18 x 1 but it has to be an Allen head cap screw.
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Rob Painter

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Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

Experience

Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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