Picked up a 99 GT 5spd. Have few questions.

190hpkilla · May 8, 2004

Finally!

After a long search I bough a 99 Vert GT 5spd about 2 weeks ago. The car is very impressive. I like it more then I expected.

I have few questions to ask..

Is it true I don’t have to change the plugs until 100K?

How do I tell if i have an LSD? (if it was an option)

I believe I should replace the IACV? Can I just get one at AutoZone?

What Gear oil do I use ( I’m searching as we speak but maybe I get the answer quicker here)

I had the car on the lift and did not see a drain or fill plug for the Rear End. How do I go about changing the fluid there. Maybe I don’t??

I have this weird rattling sound coming from rear end or the tranny when I’m creeping in 1st and then switch to 2nd and the RPM's are too low I get this GRRRRR sound. It happens when the RPM are at 1000 mark or lower.

Any tips on the maintenance are appreciated. I am about to change all the fluids and filters in the car .

Thank you.

40th GT · May 8, 2004

My '04 GT with 240 miles makes the same kind of drivetrain noise. I guess it's normal in 99-04 Mustangs. And when you get below 1000 rpms, you should downshift to first gear because you are lugging the engine. Changing the IACV isn't necessary unless you have poor idle quality. The platinum plugs that came originally on your car should last up to 60k miles. Oh, and congrats on your purchase!!

190hpkilla · May 8, 2004

40th GT said:
My '04 GT with 240 miles makes the same kind of drivetrain noise. I guess it's normal in 99-04 Mustangs. And when you get below 1000 rpms, you should downshift to first gear because you are lugging the engine. Changing the IACV isn't necessary unless you have poor idle quality. The platinum plugs that came originally on your car should last up to 60k miles. Oh, and congrats on your purchase!!

Thats why Im asking. The book says change the pugs at 100K.

People on the board say to change the IACV before it goes because that part is weak on the GT.

And after searching for hours about the tranny fluid I guess I will go with regular ford brand cause no one has a valid info on what type to use.

Thanks

Craig Mack · May 8, 2004

190HPKilla,

Congrats on the stang bro. I didn't know you supercharged your maxima? That makes two boosted maximas going to stangs, welcome aboard. Any reason why you went with the vert over the coupe?

40th GT · May 8, 2004

190hpkilla said:
And after searching for hours about the tranny fluid I guess I will go with regular ford brand cause no one has a valid info on what type to use.

Thanks

I've heard that the Redline D4 fluid gives you smoother shifts but then Tremec doesn't recommend synthetic fluid for our trannys.

Tylerb59 · May 8, 2004

GM Syncromesh for the tranny.

Plugs roughly every 60k is good.

Roger_4.6_96 · May 8, 2004

Congradulations welcome to the Club

oogtdude · May 8, 2004

my iac went on my 00gt at 28k miles.......................i wouldnt wait till 100k to change your plugs.....also check your fuel filter

Smeech · May 8, 2004

On the 1st and 2nd grr sound you mentioned, it seems normal, I have that too. I think gears may help a bit, since the car would be revving a bit higher..

d98gt · May 8, 2004

When i got my car, i did all the fluids, and i also picked up a new fuel filter/oil filter and also got a K&N.

I change my plugs pretty often

190hpkilla · May 8, 2004

Craig Mack said:
190HPKilla,

Congrats on the stang bro. I didn't know you supercharged your maxima? That makes two boosted maximas going to stangs, welcome aboard. Any reason why you went with the vert over the coupe?

Yup I sold a 2K maxima and bough a boosted 96. After running it for 5 months I stripped it and sold it stock.

I wanted a Coupe but then a good deal came along for the vert and I got it. And my friend has one too. I dont regret one bit.

Are verts any slower in the 1/4 mile?

Thank for the info.

Im going on monday to do the fuel/air filter, plugs, brake fluid, tranny fluid etc.

I suppose I have to change the rear end oil too? I did not notice a plug there.

Smeech · May 8, 2004

Because of weight and drag, it's just a tad slower. But I'm sure you'll eliminate that problem.

dmsead · May 8, 2004

the fill plug for the differential is on the upper left front of the pig. There is no drain plug. you have to remove the rear cover to drain it. My 02 GT takes 75w140 synthetic diff fluid. I suspect yours is the same.

190hpkilla · May 9, 2004

dmsead said:
the fill plug for the differential is on the upper left front of the pig. There is no drain plug. you have to remove the rear cover to drain it. My 02 GT takes 75w140 synthetic diff fluid. I suspect yours is the same.

Do i need a new seal then?

JOHNS01GT · May 9, 2004

190hpkilla said:
Do i need a new seal then?

You will need a new gasket if you remove the cover plate. You might want to look into a Haynes manual, they are pretty cheap.

190hpkilla · May 9, 2004

Do you have any idea what is the difference in the 35th ANN Mustang. I have the 35th Ann and want to know what is so special about it.

Thanks.

Silver Bullet GT · May 9, 2004

190hpkilla said:
Do you have any idea what is the difference in the 35th ANN Mustang. I have the 35th Ann and want to know what is so special about it.

Thanks.

Just cosmetic additions. Added hood scoop, different rear spoiler and side scoops, black hood stripe, black rear panel, machine polished wheels and some interior touches.

Welcome btw!

190hpkilla · May 9, 2004

Silver Bullet GT said:
Just cosmetic additions. Added hood scoop, different rear spoiler and side scoops, black hood stripe, black rear panel, machine polished wheels and some interior touches.

Welcome btw!

Hold up..

I dont have any of that. Did all 1999 stangs come with the 35th Ann badges on the fenders?

Silver Bullet GT · May 9, 2004

190hpkilla said:
Hold up..

I dont have any of that. Did all 1999 stangs come with the 35th Ann badges on the fenders?

Yes, all 99 mustangs did come with just the 35th anny badges. Did the salesman tell you it was a 35th anny car or were you just thinking that from the badges?

COramprat · May 10, 2004

JOHNS01GT said:
You will need a new gasket if you remove the cover plate. You might want to look into a Haynes manual, they are pretty cheap.

I didn't get a gasket...I just used Permatex gasket maker. Sealed up goodntite.

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