speed limit issues?

[97marquismuscle]

I've been having an issue with my car lately. For some reason when i swapper out the rear end gears in my 97 marquis aero it peaks out at about 89 mph. Now before it topped out at 119. I fixed the speed sensor so its accurate on the dash but when i put the 3.55's in it. it screwed it up.

Maybe if i put 3.73's in it would help ? I cant imagine what 4.10's would do ill probally only be able to go 49. lol

anyways anyone with knowlege of this please help me out!

[mrltd]

Surprisingly another member had this problem. Seneeb IIRC... I do not remember the solution though. Might have been a chip tune or flash tuner

[97marquismuscle]

Yeah i thought it might have something to do with the computer.. Im thinking that its thinking because of the RPM change that its going 119* (or max speed) and cuts off the engine for about 2-3 seconds before i can resume. Only issue is trying to find something compatable for a 97 because superships (the only PCM retuner i can find) even says may not adjust rev or speed limiter.

hmm any other type of information that could help would be greatly appreciated.

[mrltd]

He used an SCT (superchip tuner) on his, I remember the goofy emblem.\

Simple quick search got these:

http://www.grandmarq.net/vb/showthread.php?t=15654

http://www.grandmarq.net/vb/showthread.php?t=16246

[97marquismuscle]

thanks for your help brother.

ill try her out... (now just to find my old speedo gear) LOL!! dang small plastic parts.

[DuceAnAHalf]

put in a PI computer unless your has been tuned. The PI limiter is 134

[Grand Marquis GT]

I think an SCT tuner is in order.