Newbie question. 98 cobra with 99 cobra tranny...Speedo fix?

RoyalCars · December 2nd, 2006, 08:25 PM

I don't know if this has been adressed anywhere yet, but I just replaced my noisy and grinding 1998 Cobra transmission with a unit out of a 1999 Cobra. I went through hell of a time moving the rear tranny bracket and reinforcing the mounting points, but thats all done now.
PROBLEM:
Speedo sensors are completely different and my speedometer reads off the scale. I am here in hopes that someone out there has a fix!
Any help would be appreciated
Thanks!

FastBack71 · December 3rd, 2006, 11:07 AM

maybe some kind of speed calibrator

maverick_26 · February 13th, 2007, 01:29 AM

Were you able to get your problem fixed? I'm having the same problem with my 98 gt. It has a 99' transmission in it also. If you did get it fixed please let me know. Mines reading 150+++ in third gear at around 30mph with stock gears.

True2theHorse · February 15th, 2007, 10:09 PM

Hope this helps, but one difference is that the 99 and up stangs use a digital reading, in other words if you have a tuner/programmer you can calibrate the speedo on the 99 and up, but pre 99 the speedo uses a small gear on the tranny which has to be changed in order to recalibrate.

My guess is that you would have to check and see how the computer on in your car reads from the tranny. It may be as simple as a tuner/programmer to get it on track, looks like worse case you will just have to change the speedo gear.

Hope this helps.

Casper98GT · February 16th, 2007, 10:11 AM

Well the problem is the 99 trans are electr. speedos and the 98 cobra is not, it uses a speedo gear. Im not really sure what you could do. i would say get the cluster out of it but there are more harness' for the new cluster and nothing would work right. Im stumped.

SWEET2KSTANG · February 18th, 2007, 11:17 AM

I just put an older t45 in my 2000. all the internals are the same but you will have to change the tailshaft and the speedo gear. the sensors mount 2 different ways, mech. at an angle and elec. straight in. the electric gear on the output shaft has to come off and the mech. has to go on. i had to change the bell housing on mine also but not sure if you will have to also.

December 2nd, 2006, 08:25 PM	#1
RoyalCars Look Ma! My First Post! Join Date: Dec 2006 Posts: 1 iTrader: 0 reviews	Newbie question. 98 cobra with 99 cobra tranny...Speedo fix? I don't know if this has been adressed anywhere yet, but I just replaced my noisy and grinding 1998 Cobra transmission with a unit out of a 1999 Cobra. I went through hell of a time moving the rear tranny bracket and reinforcing the mounting points, but thats all done now. PROBLEM: Speedo sensors are completely different and my speedometer reads off the scale. I am here in hopes that someone out there has a fix! Any help would be appreciated Thanks!

December 3rd, 2006, 11:07 AM	#2
FastBack71 Enthusiast Join Date: Dec 2006 Posts: 587 iTrader: 0 reviews	maybe some kind of speed calibrator __________________ My friends used to wonder Why i joined the air force. Now they wonder why they didn't.

February 16th, 2007, 10:11 AM	#5
Casper98GT Hardcore Enthusiast Join Date: Aug 2005 Location: NEW HAMPSHIRE Posts: 2,395 iTrader: 0 reviews	Well the problem is the 99 trans are electr. speedos and the 98 cobra is not, it uses a speedo gear. Im not really sure what you could do. i would say get the cluster out of it but there are more harness' for the new cluster and nothing would work right. Im stumped. __________________ 91 LX, 5spd. Ex:Toyota/Ford tech Marine Machinery Technician, Department of Defense.

February 18th, 2007, 11:17 AM	#6
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,430 iTrader: 8 reviews	I just put an older t45 in my 2000. all the internals are the same but you will have to change the tailshaft and the speedo gear. the sensors mount 2 different ways, mech. at an angle and elec. straight in. the electric gear on the output shaft has to come off and the mech. has to go on. i had to change the bell housing on mine also but not sure if you will have to also. __________________ project warhorse under construction being built by MP2 Performance

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February 13th, 2007, 01:29 AM	#3
maverick_26 Newbie 1998 mustang Join Date: Oct 2006 Location: Spokane Valley Posts: 35 iTrader: 0 reviews	Were you able to get your problem fixed? I'm having the same problem with my 98 gt. It has a 99' transmission in it also. If you did get it fixed please let me know. Mines reading 150+++ in third gear at around 30mph with stock gears.

February 15th, 2007, 10:09 PM	#4
True2theHorse Regular Join Date: Jan 2007 Posts: 67 iTrader: 0 reviews	Hope this helps, but one difference is that the 99 and up stangs use a digital reading, in other words if you have a tuner/programmer you can calibrate the speedo on the 99 and up, but pre 99 the speedo uses a small gear on the tranny which has to be changed in order to recalibrate. My guess is that you would have to check and see how the computer on in your car reads from the tranny. It may be as simple as a tuner/programmer to get it on track, looks like worse case you will just have to change the speedo gear. Hope this helps.

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