Help! Speedo Problem

K

Kenney07

New Member

Apr 15, 2007

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CT

Apr 15, 2007

#1

• Apr 15, 2007

• #1

Hi guys.. Im New to the board. I have a 98 GT B&M Short Throw, Flow Masters American Thunder Catback, BBK H Pipe, Cold Air intake, and a Diablo Predetor Tunner.

I Just recently rebuild the rear end and put pro 5.0's 3:90's in the rear end. Now my speedo is all screwed up and they dont make a speedo gear for the 3:90 . Any ideas on how i can my speedo accurate again?

Thanks

 

mrvax

Stay thirsty my friends

Founding Member

Nov 29, 1999

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SN Moderator: Orlando, Fl.

Apr 15, 2007

#2

• Apr 15, 2007

• #2

First of all, you don't want to go with the speedo gear change. Using the non-stock one will cause it to disentergrate within months. Mine did. Can't your Predator tuner adjust this? Check the manual. If not, see my sig, get the SpeedCal and hook that up. I've had mine for years with no problems. Easy install.

 

K

Kenney07

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Apr 15, 2007

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Apr 16, 2007

#3

• Apr 16, 2007

• #3

I thought the predetor could too but i guess the speedo only goes electronic with the computer at 99 and up. At least thats what the people at Diablo told me when i called them all ticked off.. So the speedo cal will make it 100 percent accuarate? I got a quote from a speedo shop for 250 to build a custom gear box. Which one would be the better choice?

 

RandyStinchcomb

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May 25, 2005

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Randallstown, Md

Apr 17, 2007

#4

• Apr 17, 2007

• #4

you can get it close to wthin 10 mph but its going to require a gear change on the output shaft of the trans, which meenS the trans ext housing has to come off and a 21 tooth oem gear on the end of the VSS

 

CobraRed_96_GT

Active Member

May 20, 2006

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Apr 17, 2007

#5

• Apr 17, 2007

• #5

RandyStinchcomb said:

you can get it close to wthin 10 mph but its going to require a gear change on the output shaft of the trans, which meenS the trans ext housing has to come off and a 21 tooth oem gear on the end of the VSS

Click to expand...

all you need is a speedcal, you don't need a new gear. Just program the unit for 3.90's

 

RandyStinchcomb

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May 25, 2005

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Randallstown, Md

Apr 17, 2007

#6

• Apr 17, 2007

• #6

CobraRed_96_GT said:

all you need is a speedcal, you don't need a new gear. Just program the unit for 3.90's

Click to expand...

well maybe he dosn't want to spend that kind of money when all you need is 2 gears for @$35.00

 

K

Kenney07

New Member

Apr 15, 2007

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Apr 17, 2007

#7

• Apr 17, 2007

• #7

Thanks for all the help guys.. Decided to go with the speedcal only because its supose to be more accurate and i dont need any speeding tickets and my millage on the odometer going up...