rear end ratio

apk · 09-18-2001, 05:34 PM

I recently changed the rear in my 99 Cobra from the stock 3.27 to a 3.73 ratio. How do I recalibrate the speedometer. The mechanic said the speedo uses a magnetic pickup and not a toothed gear at the transmission. Reprogram the computer???

Rev · 09-18-2001, 06:41 PM

Not being a late model Stang owner, I think you have to get an add-on or programable chip to fix that. Those in the modular forum probably will know.

Rev

------------------
'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

[This message has been edited by Rev (edited 09-18-2001).]

topless tire fryer · 09-19-2001, 02:27 PM

I'm looking at the Saleen powerflash ECM, supposed to be programed to match your gear ratio and add extra HP across the board.

------------------
'95 Chrome Yellow GT ragtop, KN filter charger, Dynomax cat back, Accel plugs and wires, Chromed '95 Cobra R's (bought for $19.95, now 2 are warped!).
http://www.mustangworks.com/cgi-bin/moi-display.cgi?1883

Kevin Price · 09-19-2001, 06:15 PM

Moved to Windsor Power

------------------
SVO siamesed 351 stroked to 417ci,Yates heads, solid roller,Trans King glide and a little blue bottle
of giggle gas. My Car

09-18-2001, 05:34 PM	#1
apk Registered Member Join Date: Sep 2001 Location: Baltimore MD USA Posts: 3	rear end ratio I recently changed the rear in my 99 Cobra from the stock 3.27 to a 3.73 ratio. How do I recalibrate the speedometer. The mechanic said the speedo uses a magnetic pickup and not a toothed gear at the transmission. Reprogram the computer???

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
rear end ratio	91redgt	Windsor Power	2	09-17-2003 10:52 PM
Recommendations on a rear gear ratio	jim_howard_pdx	Windsor Power	1	09-15-2002 12:10 AM
rear end ratio	apk	Windsor Power	4	09-19-2001 09:35 PM
Whats the best way to tell if your running lean or rich?	K.C. 5.0	Windsor Power	9	09-10-2001 03:04 PM
A question of torq and rear end ratio.	Mo65	Classic Mustangs	3	12-23-2000 02:25 AM

09-18-2001, 06:41 PM	#2
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Not being a late model Stang owner, I think you have to get an add-on or programable chip to fix that. Those in the modular forum probably will know. Rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi. [This message has been edited by Rev (edited 09-18-2001).]

09-19-2001, 02:27 PM	#3
topless tire fryer All show, some go 4 now! Join Date: Jun 2001 Location: Franklin, NH Posts: 175	I'm looking at the Saleen powerflash ECM, supposed to be programed to match your gear ratio and add extra HP across the board. ------------------ '95 Chrome Yellow GT ragtop, KN filter charger, Dynomax cat back, Accel plugs and wires, Chromed '95 Cobra R's (bought for $19.95, now 2 are warped!). http://www.mustangworks.com/cgi-bin/moi-display.cgi?1883

09-19-2001, 06:15 PM	#4
Kevin Price Registered Member Join Date: Jan 1999 Location: Oxford, KS Posts: 935	Moved to Windsor Power ------------------ SVO siamesed 351 stroked to 417ci,Yates heads, solid roller,Trans King glide and a little blue bottle of giggle gas. My Car