Speed O meter not working
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Speed O meter not working
Hi all,
My question is this, I installed a ford 9 inch in my 1993 ford F150. Since doing that the speedometer has stopped working. Could someone please tell me why and how to fix it. The Ford 9 inch is out of a 1978 F150.
Thanks
James
My question is this, I installed a ford 9 inch in my 1993 ford F150. Since doing that the speedometer has stopped working. Could someone please tell me why and how to fix it. The Ford 9 inch is out of a 1978 F150.
Thanks
James
Senior User
Joined: Feb 2004
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From: Alaska
I beleive there is a speed sensor that is mounted on the rear end of your truck. This sends a signal to the speedo. When you had the rear end swapped out the sensor probabely stayed on the old rear end. Therfore you lost your speedo reading. Can any one else verify this? Is there a way he can adapt it to the older rear end. Hope this helps.
Senior User
Joined: Oct 2004
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On your '93 there was a wire to a plug on the top of the diff. That is for the speed sensor. The '78 does not have a place for this sensor nor the internal speed ring on the main gear that the sensor reads. This cannot be recreated on the '78 diff. I'm sure there is some work around for it but I do not know what it is. You also lost your rear antilock break function when you did this.
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Thanks
I am well aware of loosing my anti-lock breaks, and i don't care about that. I hope there is a work around for this type of upgrade as i think it should be fairly common. What does everyone think about the ford 9 inch? I personally think it is the best rear end for the price, but thats me.
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Joined: Dec 2004
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If you have cruise control on the truck, that probably doesn't work either. I agree the 9" rear end is a great rear end, not as nice as a **** star rear end, but that's another subject.
Seems like you gave up alot to have the 9" rear end, speedometer, ABS, cruise control. Was something wrong wth the original rear end?
Seems like you gave up alot to have the 9" rear end, speedometer, ABS, cruise control. Was something wrong wth the original rear end?
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8.8 Problems
The problems that I ran into on the 8.8 was this, I blew out 3 of them. When I say blew out I mean completely distroyed them, and the funny thing is i wasn't working them hard. One blew out when I was going down the freeway about 65mph, the second I blew out when taking a load of leaves to the dump, the third I let my friend barrow my truck and he brought it back with a blown rear end. my truck has 175,000 Miles on it but the engine still runs strong, really strong. so I did some research about what rear end to put in, found that the Dana 60 was a great rear end and super strong, but any place wanted $2000-3000 for the rear end. I thought that was steep. So I started to look at the 9 inch and the dana 44, and to be honest for what I use it for the 9 inch will blow the Dana 44 out the water. So i bought a 78 9 inch off a guy for 50 bucks, put new gears, bearings, seals, and a detroit locker in it for 600, and I have a super strong rear end. But like you guys said, there is some draw backs.
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