Join Date: Feb 2013
Location: East TN
Bronco Info: 1996 XLT 351w 6" superlift superrunner with superrunner steering
I had an Issue while building this up. On the rear axle there is a variable speed sensor (VSS). There is one on the 8.8 and one on the 10.5 rear end. On a 1996 model Bronco the VSS feeds the Programmable Speedometer / Odometer Module (PSOM) before the transmission receives the feed. I had no speedometer when I first put the new axle in. I thought that the issue was in the 10.5's VSS so I replaced that. Still no signal to the PSOM. I assumed that it was a wiring issue so I jumped past the place I assumed could be bad in my wiring and still no signal. That's when I started to dig around the internet to find other possible scenarios. I had prior to the install started to have an issue with "waver" in my speedometer. After reading a lot I started to suspect my PSOM had gone bad. I got a used tested good unit. This also did not fix my problem. At this point i was pulling my hair out a little. I dug in deeper on the web. I jump bypassed my Four Wheel ABS unit (4WABS) not it. I jumped a wire straight off the VSS to the PSOM, not it. I checked to see if the new VSS was good, it was. I took the VSS out of the rear end to see if I could get a drill with a router bit to produce a signal. No signal. At wits end, I decided to pull the VSS from the 8.8 rear end. I tried the signal test with the old VSS and I got signal! I was baffled but elated. I decided to see if the dimensions were the same on it. The magnet area was much larger but other than that it looked the same. I put it in, the 4wabs was still jumped out and I still had the straight wire ran underneath the truck to the PSOM. Taking no chances I hooked it up with everything jumped out. It worked! I stepped it back one piece at a time and it worked. While trying things I noticed that the old magnet was much stronger. This is all I can think that is making the 8.8 vss work and not the 10.5 vss, by the way these are all ford parts.
Everyone should believe in something; I believe I'll have another drink.