If you've put gears in your 96-98 AUTO GT PLEASE read!

[Wes8398]

DropTop - thanks for the reassurance. He IS trying to say that I'll be all over the rev limiter if I don't have the ECM reprogrammed for new shift/lock/unlock points ... but this doesn't make sense if you guys installed gears without reprogramming and you were fine.
Could/would there be any reason that a 3.90 or a 4.10 would change the scenario??

 

[96sohc]

3.90 is not a Ford gear, there is no speedo gear to calibrate for that.

 

[Jrgunn5150]

I think you will hit the rev limiter because the computer will think it is not as high in the RPM band as it really is. For instance, the computer will think you are at 5k, but really you are at 6200, and bang, you're on the limiter.

 

[Jrgunn5150]

^^ But going with what Droptop said, I think that is only with the speedo uncorrected.

 

[justinschmidt1]

you may ..you may not hit the limiter at wot with gears...with my auto...It would sometimes hit the limiter in 1st


and yes with a sct xcal 2 they can adjust automatic shift points.

He had to tell mine to shift earlier than it would normaly becuase of the gears...i can make it shift anywehre from 5500 to 6000 by adjusting the +1 +2+3 mph on the sct.

Go with a sct xcal and get a tuner to tune it...Get some 4.30s!

dont go 3.73s unless its your DD

 

[voidfinger]

if you have a dd still get 4.10's or higher :drunk:

I'm wondering what the gear ratio's in the trans are??? i'm wondering so i can caculate the total gear multiplications.

 

[Wes8398]

I don't think the rev limiter issue has anything to do with the speedo being off - but I'm going to have my speedo corrected with a "speedcal" anyway. The rev limiter issue doesn't involve the ECM now knowing what the actual RPM's are, from what I've been told and what I've read. It has to do with the quicker acceleration. Right now the limiter's set at 6100RPM - and the ECM tells the trans to shift at 4900 RPM because it knows that the time it takes for the signal to reach the trans, and the trans to actually shift, it will be very close to 6100 RPM by the time it actually shifts WITH THE STOCK GEAR. Now put a smaller gear in there, and the time it took for the signal to send and the trans to shift now has you further in the RPM range because of the faster acceleration. That's when the "BANG" happens.
And as for 3.90 "not being a Ford gear" - it is a Ford gear. They actually don't sell the speedo gear to correct (accurately) for anything over 3.73 - but that doesn't mean that a 4.10 or 3.90 isn't a Ford gear. Lots of people have 3.90's. To stay accurate (and not deal with a shredded speedo gear every 4 years) you have to have the "speedcal" mod done with anything over a 3.73 though.
And to the others - it IS my DD. I want 4.10's, but I wanna keep "fair" highway gas mileage and I don't like driving slow on the highways. So I'm between a 3.90 and a 3.73 right now. MAYBE a 4.10. The gear ratios are as follows: 1st = 2.84 2nd = 1.55 3rd = 1 4th = .70 You can use any calculation tool to figure out any given RPM at any given speed with any given wheel/tire diameter and any given gear ratios. I've been using this one: http://www.csgnetwork.com/multirpmcalc.html to figure out where I'd be at 75 MPH (highway speed) with the different gears.

 

[voidfinger]

wow are you shitting me ???? the 4r70w only has a 2.84 1st???? that sucks big time.

 

[Jrgunn5150]

wow are you shitting me ???? the 4r70w only has a 2.84 1st???? that sucks big time.

That's actually nice for a car, the Chevy 700r4's 3.06 first makes it suck the big one in a car application. Also remember your Converter gives you some more multiplication. And my 6 speed has a 2.66 first gear...

 

[voidfinger]

well i was looking at doing the 5 speed swap because i was going to put the 4v in with the 5 speed and 4.30's b/c the gear multiplication would have been like 14 or somthing...the six speed sucked the big one on the multipaction or whatever with like 12....or so, now my auto is only at 11.644 with 4.10's

 

[Dusstbuster]

The reason he's telling you to change your shift points is because the steeper gears will put you through the RPM band quicker. Say the computer is initially programmed to shift at 5200RPM and it takes .5 a second to shift. With regular gears the designers knew it would shift right as the engine was about 5450RPM so you would have no worries with hitting the limiter. The steeper gears make you climb the RPM's quicker though so that "stock" .5 second shift time would put you at 5700RPM instead (hitting the limiter).

All those numbers and RPM's are made up by me, but that's the easiest way of explaining why they are saying you should have shift points adjusted. Basically it's just dropping the shift point to 5000RPM or something smaller so the car shifts before you hit the limiter.

 

[GaryG]

i was on a website today, believe it was lethalperformance..but it looked like they had a SCT XCal tuner that would work on the 96-98 cars...would that work?

 

[Dusstbuster]

i was on a website today, believe it was lethalperformance..but it looked like they had a SCT XCal tuner that would work on the 96-98 cars...would that work?

Would work how so? The XCals work on our cars the way it is, you just cannot adjust for new gears with anything besides a speedcal (hooray) or a speedo gear (boo). No type of electronic device short of a speedcal will allow that on our cars as we don't have electronic speedometers.

 

[GaryG]

heres the link http://www.lethalperformance.com/pa...-calibrator-2-user-adjustable-flash-tool.html

sry i could just be reading it wrong

 

[voidfinger]

i was on a website today, believe it was lethalperformance..but it looked like they had a SCT XCal tuner that would work on the 96-98 cars...would that work?

Would work how so? The XCals work on our cars the way it is, you just cannot adjust for new gears with anything besides a speedcal (hooray) or a speedo gear (boo). No type of electronic device short of a speedcal will allow that on our cars as we don't have electronic speedometers.

Our cars don't have an electronic speedometer? you sure about that?

 

[Jrgunn5150]

Not quite electric, mechanically driven electric sensor, which in turn mechanically drives and old-school odometer. Our car's are a mess really. I know the Xcal cannot change our speedo's, I had one before I had the speedcal.

 

[voidfinger]

o well..shit on my party huh.... :hammer: Anyway, i was thinking that the thing could since it could calibrate for the tire rim size and stuff and i read it could do the gear too.... owell

 

[Jrgunn5150]

All the cool stuff is for New Edge cars, that's pretty much the rule of thumb I use.

 

[1996mustangGT]

All the cool stuff is for New Edge cars, that's pretty much the rule of thumb I use.

+1
if its hard and complicated....its for the early sn-95's

 

[Dalamar]

All the cool stuff is for New Edge cars, that's pretty much the rule of thumb I use.

+1
if its hard and complicated....its for the early sn-95's

Haha, no doubt.

I had 373 and stock auto in mine for 5 years. manually shifted when I wanted ect. it worked fine.
the jmod, and higher staul will wake it up a lot, especially on the launch.