Anyone Ever Swap A Gagt Transmission?

[mike2002]

has anyone ever tried this? place by me sells 4t45's for $230, they dont have any gt's transmissions right now, but even if they were 300, that sounds like a good deal. they have around 40k on them. my car has 78k.

i dont even know how hard it is to swap a transmission, but if this could all be done for $400, wouldn't the benifits be worth it? i know you'd need a new pcm from DHP, but thats not a big deal

[Youngblood77]

there are definate pluses, I give you that, but I think i'd wait a while. Atleast until you start having tranny troubles anyways. Other than having a low-mileage tranny, what's making you feel that this is the thing to do? you can always get a PCM re-program for your own tranny. I know the final drive ratio is different on a GA, does anyone know if they get better or worse gas mileage than we do because of his? I think that that would be a major factor in deciding for or against the swap if it were me......

[FormulaNERD]

where do you live mike?

[rmulax19]

i've seen 3.4 aleros beat 3.4 gagts in races. both had the same mods, too. i would stick with the alero tranny.

[bigd6983]

Originally posted by rmulax19@Dec 11 2004, 03:07 PM
i've seen 3.4 aleros beat 3.4 gagts in races. both had the same mods, too. i would stick with the alero tranny.
that doesnt mean anything......the car isnt everything.......ive spanked on a 03 wrxdriven by what looked like a 16 or 17 year old kid, i know if it had been an experienced driver, i woulda got embarrased lol......

and just to let you know, because of the final drive ratio on grand am trannys their cars are faster than our's stock........

thats why he would think of doing this.........

[mike2002]

the fact that the alero was still faster just means it had a stronger engine. in general it seems the gagt's seem about .3-.4 seconds faster in the 1/4, and a stronger 0-60. i used to have a performance calcultor thing, that had like every car out there in it, and what type of times it could do according to its stats. it was extremely accurate in relation to the magazine times. the cool thing was, you could change things, like hp, tq, fdr. so you could pull up the alero, get the estimated times, then change JUST the fdr from 3.05 to 3.29, and see what type of gains you'd get, but i cant find that program anywhere.

i live in MN, its a place about 30 minutes from here that has some regular 4t45's for $230, ranging from like 31k-42k.

thing that kind of confuses me, is according to those, only 2001 transmissions will work in a 2001, i thought any 1999-2004 would work.

it may be somthing that its just worth waiting till mine breaks to do, but if i could do the swap for $400, im sure i could sell my working transmission for 150 or more.

im just wondering if anyones tried it, i most likely wouldn't do it unless mine crapped out.

[FormulaNERD]

i want a gagt tranny, pm me mike you find a few.

[bigd6983]

Originally posted by mike2002@Dec 11 2004, 03:48 PM
the fact that the alero was still faster just means it had a stronger engine.

thing that kind of confuses me, is according to those, only 2001 transmissions will work in a 2001, i thought any 1999-2004 would work.


lol no it doesnt mean it had a stronger engine, how fast a car makes it down a track has to due with two things, the car and the driver......if either/or arent up to par the other wont be......

and as far as only being able to use 2001's on 2001's it could be a wiring/electric issue.........i dunno though

[overdrive75]

You need to be very carefull on the year that you use, come electrical components are different between years, requires a different cal to run these. Also an 04 will not work in an older car as PSM Pressure Switch Manifold was decontented so that there are fewer pressure swithes to tell it what gear range it is in. So don't put an 04 trans in an older car that is a huge no no. Also don't put an older model year trans in an 04 car that is a huge no no as well.

Any further questions let me know.

[FormulaNERD]

so a 99 gagt tranny will work in a 99 alero?

[-Alero-]

can the grand am trannys handle more horsepower than 300 (like ares) if not your only really getting one benefit out of this........

[FormulaNERD]

no, it's the same exact transmission, just slightly different gear ratios.

[overdrive75]

Originally posted by FormulaNERD@Dec 11 2004, 09:06 PM
so a 99 gagt tranny will work in a 99 alero?
With an aftermarket PCM from like say DHP cal'ed for a GAGT

[1WhiteOSV]

GAGT's pull a lot harder in the 1st and 2nd gears than the Alero...my friend has an 01 GAGT and he pulls on me right when I shift into 2nd gear. I have a tranny mount and I am better at starts so I pull him through 1st, but that's only cuz I hook up and he spins. We had the exact same mods and we raced and I took him till about 60mph then he passed me and about 88 or so my front bumper was about 6in behind his rear bumper...He just got a 62mm TB last week and we raced again and he is about 2 cars ahead of me after 88 now...that TB helped SO much. Stock to stock, the GAGT is much quicker.

[flalero]

That's weird because I always pull on GAGT's until we get near 90mph, then it starts to even out a little bit. If I go from a drop with a GAGT the race is little bit closer, but I stil take them. I figured with a higher final drive ratio, they would be slower off the start. Maybe that's why they got 5 more hp than us, to make up for the tranny gear ratios.

[1WhiteOSV]

are you talkin w/ GAGT's that are stock? or one's w/ similar mods? Because I can easily beat stock GAGT's

[mike2002]

stock for stock, gagt's are faster. not to say every gagt is faster than every 3.4 alero. but in general, they should be. the 3.29 fdr helps there acceleration more than our 3.05 should help power in all gears, since they will always be at a higher rpm at the same speed. the 5hp isn't really there, its the BS "ram-air" that doesn't do anything

im not sure if there is a wieght difference in the cars though, they've got all that plastic....options depend too, a fully loaded gagt (sunroof, leather, monsoon, spoiler) gagt is going to wiegh more than a stripped 3.4 alero

[flalero]

Originally posted by 1WhiteOSV@Dec 12 2004, 11:45 PM
are you talkin w/ GAGT's that are stock? or one's w/ similar mods? Because I can easily beat stock GAGT's
Yeah, stock ones with the Alero. I used to beat stock ones (off the line, anyway) with my GASE then they would run me down. I've honestly never come across another N-body of any type, since I've had my Alero or GA, with mods similar to mine. There's none down here in Florida where I live, in Texas where I bought my car, and a few in the Denver area, where I owned my GA. I've never raced another N-Body with performance mods, let's just put it that way, so I don't know how it would compare. I'm sure a GAGT with same mods would be an awesome race.

[1WhiteOSV]

yea, my friend and I match each other's mods...and now another friend of mine just got a GAGT also so there's 3 of us that'll have modded N-Body's. It's awesome, I love it.

[kwhauck]

this is from some of the knowledgable guys at GAGT.com, FYI the SE's have the same tranny as the alero...


Originally posted by AaronGTR+--></div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (AaronGTR)</td></tr><tr><td id='QUOTE'><!--QuoteBegin-MonoChrome83
Sorry to open a dead thread, but would you have to swap out the whole tranny just for the gears?? I only found out that SE's and GT's had different gear sets a few days ago, and would like to improve my acceleration.

Would all the computer work be nessicary?? or could I have the dealer just flash my computer with the GT configuration? I don't know about most of this stuff, so I'm looking for some help.

You wouldn't need a whole new tranny, just the final drive gear changed. Other the that gear ratio, the SE and GT trannies are exactly the same. After changing that you'd have to have the PCM reflashed with a GT program. Not sure if a dealer could do it for you or not. I know you can change it with DHP's powertuner software that's coming out.

If you're just looking for better acceleration though you should just try to increase the power with a few of the basic bolt-ons. It's not worth changing gears unless you plan on doing a lot of moddifications to your car. You have to remove the entire drive train to do it so it's not easy or cheap, especially for a novice.[/b][/quote]

[overdrive75]

^^ That is exactly right.

[mike2002]

and the big question...how do you change the FDR gear? is it possible for the average DIY? or would a tranny shop do it?

[overdrive75]

For you average DIY take it in, while transmission are fairly simple, they are really easy to goof up especially if you don't have the right tools and pay attention to how you take them apart.

[mike2002]

any idea on the start to finish cost?