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Feb 19, 2009 | 08:11 PM

#16

pro70golfer14

Senior User

Joined: Jan 2008

Posts: 334

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From: Palatka, Florida

ya a 9 inch wouldbe in my truck if the speed sensor deal wasnt a problem. but instead i had to just by more gears for the lousy 8.8 and keep running it. if i wanted to go to like a 10.25 out of a bigger truck, do they have speed sensors on the rear end?

Feb 19, 2009 | 08:16 PM

#17

jk89cat

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Joined: Dec 2006

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From: vernon hills IL

Quote:

Originally Posted by humpstowing

I have a 9inch in my 90 mod F150 & there was no mods to put it in if you go to the 250 diff I think you would have to change to 8 stud rims I think?

ummm no mods? diff mounted speed sensor is quite a big one

Feb 19, 2009 | 08:21 PM

#18

BigBlueOx

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Joined: Dec 2008

Posts: 1,226

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From: Rusty, Maine

yes the late model F-250s have the speed sensor in the rear. I have a '96 F-250 donor truck that I'll sell you the rear end.

Feb 19, 2009 | 08:21 PM

#19

1966Tbird

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Joined: Dec 2006

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Quote:

Originally Posted by jk89cat

ummm no mods? diff mounted speed sensor is quite a big one

not on a 90 the speed sensor is on the tailshaft

Feb 20, 2009 | 08:58 AM

#20

humpstowing

5th Wheeling

Joined: Nov 2007

Posts: 31

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From: Australia

My speedo pick comes out of the transfer case it is cable but also has wires coming out of the pick up as well at this stage I don't know what the wires do as the cable go's up to the dash

Feb 20, 2009 | 10:58 AM

#21

1966Tbird

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something you could try is put a yoke in the tranny pull the driveshaft and put it in drive, if the speedo works then that means you can ditch the 8.8 for a 9in

Feb 20, 2009 | 04:51 PM

#22

EPNCSU2006

Lead Driver

Joined: Nov 2002

Posts: 9,557

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From: Concord, NC

The wires coming from the tailshaft where the speedo cable mounts, link the VSS (in-line with cable at transmission/transfercase) to the engine computer and cruise control. The speed sensor in the rear end was only used for RABS on 87-91 trucks.

Feb 21, 2009 | 05:23 PM

#23

humpstowing

5th Wheeling

Joined: Nov 2007

Posts: 31

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From: Australia

Quote:

Originally Posted by EPNCSU2006

Ok being that my F series was one of the early EFI 351's(no longer in car) in Australia & has never had cruise control is there any way to use the wire's to run the cruise or do they only register motion not the actual speed.