Speed sensor from diff to trans
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4wd Low
Joined: Jun 2017
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Speed sensor from diff to trans
I own a 95 f150 with the stock 8.8 rear end. Ide like to upgrade to a 9in diff but the speed sensor for my truck is in the diff and I suck when it comes to wireing and electrical. I've heard that some of these trucks had the sensor in the tailshaft of the trans. I'm also needing to order a new trans for the truck. It's a beefed up e4od and they come with an option for the speed sensor to go in the trans. But I don't know what I need to do to make it work. Any experience with this at all.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
If the transmission you get has the drive gear on the output shaft and the tail shaft housing has a place for it you can put a VSS in it from a F53 or and older pre 1992 trucks VSS.
You will need to reset the PSOM to a conversion constant of 1.0 (not easy done) then put a driven gear on the VSS to calibrate the speedometer.
Note the RABS will not work with the above set up.
You will need to reset the PSOM to a conversion constant of 1.0 (not easy done) then put a driven gear on the VSS to calibrate the speedometer.
Note the RABS will not work with the above set up.
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
The 95 speedometer(PSOM) looks for the 108 or 120 tooth tone wheel(depending on axle) that is inside the diff. The tail shaft VSS output mayl not give the correct pulse per mile the PSOM needs to calculate the speed.
I have seen others make up a tone wheel attached to the driveshaft and used the VSS sensor from the axle to drive the PSOM.
I have seen others make up a tone wheel attached to the driveshaft and used the VSS sensor from the axle to drive the PSOM.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
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From: Kentucky
Personally I think a 9" rear axle is a downgrade. The Ford 8.8" has been proven to be plenty stout with the right parts. Unless you are looking for bragging rights, stick with the 8.8" rear axle.
Logistics Pro
Joined: Aug 2010
Posts: 3,717
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From: Chillicothe
I've seen an 8.8 live through clutch dumps with 38 inch thornbirds and go 8s in a 1000hp mustang. Forget the 9inch and just put a good posi unit in the 8.8 and since it's 20 plus years old treat it to new bearings and be done with it.
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snizzitch
Clutch, Transmission, Differential, Axle & Transfer Case
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Oct 19, 2001 05:01 PM
