Results 1 to 20 of 20

Speedo off

This is a discussion on Speedo off within the Firebird / WS6 forums, part of the Vehicle Specific category; I searched some past posts, but didn't really get the answer I'm looking for. I bought my 99 Trans Am ...

  1. #1
    Member Piranhaz's Avatar
    Join Date
    Aug 2008
    Location
    Minnesota
    Age
    46
    Posts
    269

    Arctic White
    1999 Trans Am M6

    Speedo off

    I searched some past posts, but didn't really get the answer I'm looking for. I bought my 99 Trans Am a few days ago and the speedo is off by 10-12 MPH (higher than I am really going). It has the correct size tires on it so I'm not sure why it's off. I do not know the previous history of the car but I'm assuming everything is stock as far as gears etc. What can I do to get the speedo to read the right MPH?? Do I need to take it to a dealer???


    Thanks


    Chris

  2. #2
    Senior Member Too Fast's Avatar
    Join Date
    Nov 2006
    Location
    Indianapolis
    Age
    54
    Posts
    5,170

    Black
    2000 WS6 6spd Hooker LT

    Sounds like somebody put different gears in it, like from a 2.73 to a 3.23 or something. You can have somebody fix this with a programmer like Diablo, or if you know someone with an HP Tuners software or LS1 edit, if you know what your current gears are.

    Most dealers would probably be clueless, but call them and ask if you want to.

  3. #3
    Member screaminbird's Avatar
    Join Date
    Aug 2008
    Location
    Aurora, Illinois
    Age
    28
    Posts
    314

    White/Gold
    99 T/A sold/67 Firebird

    i was just goingt o say the exact same thing

  4. #4
    Member Piranhaz's Avatar
    Join Date
    Aug 2008
    Location
    Minnesota
    Age
    46
    Posts
    269

    Arctic White
    1999 Trans Am M6

    Quote Originally Posted by Too Fast View Post
    Sounds like somebody put different gears in it, like from a 2.73 to a 3.23 or something. You can have somebody fix this with a programmer like Diablo, or if you know someone with an HP Tuners software or LS1 edit, if you know what your current gears are.

    Most dealers would probably be clueless, but call them and ask if you want to.
    The car is supposed to have 3.42 gears as far as my code tells me. I'll have to verify that and go from there.


    Thanks guys


    Chirs

  5. #5
    Senior Member Too Fast's Avatar
    Join Date
    Nov 2006
    Location
    Indianapolis
    Age
    54
    Posts
    5,170

    Black
    2000 WS6 6spd Hooker LT

    6-speed, eh? Nice. Sounds like somebody put in 3.73 or 4.10. If the gears are not making much noise, I would definitely keep them!

  6. #6
    Member Piranhaz's Avatar
    Join Date
    Aug 2008
    Location
    Minnesota
    Age
    46
    Posts
    269

    Arctic White
    1999 Trans Am M6

    Quote Originally Posted by Too Fast View Post
    6-speed, eh? Nice. Sounds like somebody put in 3.73 or 4.10. If the gears are not making much noise, I would definitely keep them!

    Yeah! I was looking for awhile and really wanted a manual. I'll check it out tomorrow and see what gears they are. I'm curious now too.


    Chris

  7. #7
    That guy thearborbarber's Avatar
    Join Date
    Nov 2007
    Location
    SoDak
    Posts
    892

    White over Red
    1991 Suburban

    Jack up rear and count the number of time the driver shaft turns while you rotate a rear tire one time. Then you know your rear end ration.

  8. #8
    Member Piranhaz's Avatar
    Join Date
    Aug 2008
    Location
    Minnesota
    Age
    46
    Posts
    269

    Arctic White
    1999 Trans Am M6

    Quote Originally Posted by thearborbarber View Post
    Jack up rear and count the number of time the driver shaft turns while you rotate a rear tire one time. Then you know your rear end ration.

    Yeah, that's the way I usually do it. It gets you close enough to figure it out anyway!

    Thanks


    Chris

  9. #9
    Senior Member Too Fast's Avatar
    Join Date
    Nov 2006
    Location
    Indianapolis
    Age
    54
    Posts
    5,170

    Black
    2000 WS6 6spd Hooker LT

    Easy to do with a normal clutch type limited slip, but my torsen works differently, loose until it feels the torque, always pulls both tires straight, right or left.

    And yeah, 6-speed FTMFW! That is why I sold my '98 TA, it had an AT with 2.73.

  10. #10
    Member Piranhaz's Avatar
    Join Date
    Aug 2008
    Location
    Minnesota
    Age
    46
    Posts
    269

    Arctic White
    1999 Trans Am M6

    Quote Originally Posted by Too Fast View Post
    Easy to do with a normal clutch type limited slip, but my torsen works differently, loose until it feels the torque, always pulls both tires straight, right or left.

    And yeah, 6-speed FTMFW! That is why I sold my '98 TA, it had an AT with 2.73.


    OK, I'm confused. I'm getting about 2.25 revolutions of the driveshaft per 1 rev. of the tire. This would = about a 2:23 gear ratio?? Can that be possible?? That's not even an option as far as I know. Am I doing something wrong here???

    Jacked up the car and tried turning the driveshaft but the wheel I was counting would slip and the other would turn. So I lowered one side to lock it and then turned the driveshaft to get the free wheel to turn and came up with this ratio. Is that really coming out right though???

    Maybe I'll just have to pull the cover and check it out.

    Any thoughts???

  11. #11
    Senior Member Too Fast's Avatar
    Join Date
    Nov 2006
    Location
    Indianapolis
    Age
    54
    Posts
    5,170

    Black
    2000 WS6 6spd Hooker LT

    You could use a helper, she could keep the other wheel turning the same as the one you are turning so they both have the same rotation and count the ratio that way. Or, like you say pull the cover and do the count, this way you can know when the last time you had new synthetic fluid put in.

  12. #12
    Member Piranhaz's Avatar
    Join Date
    Aug 2008
    Location
    Minnesota
    Age
    46
    Posts
    269

    Arctic White
    1999 Trans Am M6

    Quote Originally Posted by Too Fast View Post
    You could use a helper, she could keep the other wheel turning the same as the one you are turning so they both have the same rotation and count the ratio that way. Or, like you say pull the cover and do the count, this way you can know when the last time you had new synthetic fluid put in.

    Good point, probably just better off pulling the cover and putting new fluid in anyway. I don't know the history of the car.

  13. #13
    Formula Driver! 96Firebirdformula's Avatar
    Join Date
    Jun 2007
    Location
    Seymour, Indiana
    Posts
    629

    Batman Black
    1996 Formula

    Here easy was to figure out what gears you got. Just click 98 M6. Then look at RPM in the gear.

    http://www.f-body.org/gears/

  14. #14
    Member Piranhaz's Avatar
    Join Date
    Aug 2008
    Location
    Minnesota
    Age
    46
    Posts
    269

    Arctic White
    1999 Trans Am M6

    They are 4.10's!!!!


    Chris

  15. #15
    Senior Member Too Fast's Avatar
    Join Date
    Nov 2006
    Location
    Indianapolis
    Age
    54
    Posts
    5,170

    Black
    2000 WS6 6spd Hooker LT

    Nice gears for a 6-speed. Did you get your speedo calibrated yet?

  16. #16
    Member Piranhaz's Avatar
    Join Date
    Aug 2008
    Location
    Minnesota
    Age
    46
    Posts
    269

    Arctic White
    1999 Trans Am M6

    Quote Originally Posted by Too Fast View Post
    Nice gears for a 6-speed. Did you get your speedo calibrated yet?
    Yeah, everything is good to go. Got the Skip shift removed too, boy is that nice!!!

  17. #17
    Senior Member Too Fast's Avatar
    Join Date
    Nov 2006
    Location
    Indianapolis
    Age
    54
    Posts
    5,170

    Black
    2000 WS6 6spd Hooker LT

    I put in a SLP skip shift eliminator, I like it because when I see the skip shift light come on, I can either go into fourth gear or give the light the finger. Usually I give the light the finger!

  18. #18
    Impounded
    Join Date
    May 2008
    Location
    Verdigris, OK
    Posts
    2,165

    NBM
    99 z28

    Quote Originally Posted by 96Firebirdformula View Post
    Here easy was to figure out what gears you got. Just click 98 M6. Then look at RPM in the gear.

    http://www.f-body.org/gears/
    why no 99 a4 f-body?

  19. #19
    Member bballking_2007's Avatar
    Join Date
    Apr 2007
    Location
    Mo
    Posts
    239

    Black
    2000 Trans am ls1

    CUZ the a4 has four gears and the m6 has six gears! lol it would be WAY off.

  20. #20
    Impounded
    Join Date
    May 2008
    Location
    Verdigris, OK
    Posts
    2,165

    NBM
    99 z28

    duh.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. speedo only goes to 25
    By mach2mack in forum General Help
    Replies: 5
    Last Post: 08-14-2011, 10:29 AM
  2. Speedo help
    By CARHAULIN in forum General Help
    Replies: 11
    Last Post: 09-05-2008, 01:25 PM
  3. Where can I get a new speedo?
    By Rojerlockless in forum Firebird / WS6
    Replies: 1
    Last Post: 08-10-2008, 07:45 PM
  4. GTO Speedo run. 53-114
    By juiced99ws6 in forum Almost Anything Goes
    Replies: 9
    Last Post: 06-07-2008, 03:31 PM
  5. speedo
    By lopezog in forum LT1
    Replies: 1
    Last Post: 09-22-2007, 09:57 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •