Will 4.10's mess up speedo?

Damaso · August 9th, 2007, 11:29 PM

Hello. I have a 88 5.0 notch that I bought not too long ago. It was a swap car so i put the 5.0 speedometer in it. I also had the speedometer gears replaced. It still seems not to read the correct speeds and is like 10 to 20 mph off. I was wondering if it is possible that the previous owner put new motive gears which caused the speedometer to be offset. It is just a theory because he put a lot of work in the car so why not put gears. It also kicks slightly when shifting at low rpm, and my mechanic told me the engine and trans are practically new. What could solve my speedo issue? thanks

Iownastang · August 9th, 2007, 11:33 PM

They will if you do not have the right gear for the speedo,and tire size can through your mph off a little bit.And is it a 5 speed or an aod.Do you know what year the engine and trans is?

89StangGT · August 10th, 2007, 02:20 AM

yeah mines whack. says 110 when im doing like 70

Stangzilla · August 10th, 2007, 03:07 AM

Originally Posted by 89StangGT

yeah mines whack. says 110 when im doing like 70

Get the gear.. its a sinch to install... In a manual anyway.. I have never done one in an auto if thats what u have..

crowbar73 · August 10th, 2007, 06:59 AM

I put a 23 tooth speedometer gear in my aod and it was also an easy swap. I have 4:10's in the rear. Just take out the bolt for the speed sensor and pull it out of the transmission. I had to replace my cable too (twice actually) b/c the headers kept melting them. I got it re-routed and seems ok now. My speedometer used to jump around and all that but now it is smooth.

89StangGT · August 10th, 2007, 10:17 AM

yeah ive just never gotten around to doing the gear thing in the trans. i do have a 5 speed. but i dont drive my car that much, and when i do its not like i go the speed limit so it doesnt bother me

August 9th, 2007, 11:29 PM	#1
Damaso Regular Join Date: Apr 2007 Posts: 159	Will 4.10's mess up speedo? Hello. I have a 88 5.0 notch that I bought not too long ago. It was a swap car so i put the 5.0 speedometer in it. I also had the speedometer gears replaced. It still seems not to read the correct speeds and is like 10 to 20 mph off. I was wondering if it is possible that the previous owner put new motive gears which caused the speedometer to be offset. It is just a theory because he put a lot of work in the car so why not put gears. It also kicks slightly when shifting at low rpm, and my mechanic told me the engine and trans are practically new. What could solve my speedo issue? thanks __________________ 1998 GT 5spd- Full pi swap, Fenderwell CAI,UPR Catted X-Pipe, Mac FlowPath Cat-Back 1988 LX auto- Pypes violator cat-back, UPR X-Pipe, Shift Kit, 4.10 Gears, Pulleys, Suspension upgraded, CAI 1999 GT 5spd- CAI, Pypes violator cat-back

August 10th, 2007, 02:20 AM	#3
89StangGT Moderator Join Date: Aug 2006 Location: Toledo Ohio Posts: 1,035	yeah mines whack. says 110 when im doing like 70 __________________ 2004 SVT Cobra 2000 LS1 Camaro

August 10th, 2007, 06:59 AM	#5
crowbar73 Regular 1989 Mustang GT Join Date: Jul 2007 Location: Waynesboro, VA Posts: 117	I put a 23 tooth speedometer gear in my aod and it was also an easy swap. I have 4:10's in the rear. Just take out the bolt for the speed sensor and pull it out of the transmission. I had to replace my cable too (twice actually) b/c the headers kept melting them. I got it re-routed and seems ok now. My speedometer used to jump around and all that but now it is smooth. __________________ He is no fool who gives what he cannot keep to gain what he cannot lose." Jim Elliot Garage: http://www.moddedmustangs.com/forums...-member-10915/

August 10th, 2007, 10:17 AM	#6
89StangGT Moderator Join Date: Aug 2006 Location: Toledo Ohio Posts: 1,035	yeah ive just never gotten around to doing the gear thing in the trans. i do have a 5 speed. but i dont drive my car that much, and when i do its not like i go the speed limit so it doesnt bother me __________________ 2004 SVT Cobra 2000 LS1 Camaro

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