99 sihlouette tranny in 03 alero?

Duval · 11-29-2012, 12:21 AM

Hey guys, nothing to do with the wireing issues or anything I just wana know if the 99 olds sihlouette 3400 transmission will work in my 2003 alero?

03glgold · 11-29-2012, 12:48 AM

I believe it should though I am not sure of any computer issues you may have. Both use a 4t-65e, however even in the alero if I remember right there were minor changes to the 4t-65e throughout the years

Duval · 11-29-2012, 01:11 AM

Is it something I would be able to spot right away? Or is it internal?

03Sleepr · 11-29-2012, 02:10 AM

They use a 4t45e. And iirc they have a different gear ratio, but it should work fine.

03glgold · 11-29-2012, 02:14 AM

from what I am reading some are external and some are internal...Sleepy and mfuller doing the f40 swap shows that you can make anything work if you are willing to put the time and effort in it...as long as everything is the same attaching to the motor is the same you should be able to find a way to make it to work, however if you are tired of chasing programming and wiring bugs then I would advise you to find an alero or grand am tranny from the same year as you have it set up for...I am not really a 3400 person I am just researching stuff as you ask questions...Someone who has messed with it a little bit more could tell you precisely if I am wrong or right

03glgold · 11-29-2012, 02:32 AM

Quote:

Originally Posted by 03Sleepr

They use a 4t45e. And iirc they have a different gear ratio, but it should work fine.

My bad the alero does have the 4t45e...sorry for the mix-up...I quit working on homework because I was tired and not focusing enough to give proper answers and then I came on here.

xXManwhoreXx · 11-29-2012, 06:24 AM

It will work but the gearing sucks

01GrandAm · 11-29-2012, 06:58 AM

It will work if you want to make custom mounts, custom axles and reprogram your PCM. Alero uses a 4T45E transmission where the Silhouette uses a 4T65e transmission.

sleepyalero · 11-29-2012, 11:12 AM

just use a grand am transmission.

jawa · 11-29-2012, 11:22 AM

bah just use a f40 or a f23

Nas Escobar · 11-29-2012, 12:51 PM

Ok, so after looking up the 4T45E, it appears that the Olds Alero has a different gear ratio than the Grand Am o.O

Apparently the GA has a 3.63 final ratio whereas the Alero has a 3.05 final ratio.

I'm not sure how that would affect the drive of the Alero but I would recommend looking into that.

If you want to keep the "Stock" drive ratio, you have to pull the trans out of a G6 or a 2005-2008 Malibu/Malibu Maxx.

If you want the GA's drive ratio then you have to pull the trans out of a GA (obviously) or you can get it out of the Cobalt, Vue, or Ion. Just depends how you want to do this.

sleepyalero · 11-29-2012, 02:15 PM

Quote:

Originally Posted by Nas Escobar

Ok, so after looking up the 4T45E, it appears that the Olds Alero has a different gear ratio than the Grand Am o.O

Apparently the GA has a 3.63 final ratio whereas the Alero has a 3.05 final ratio.

I'm not sure how that would affect the drive of the Alero but I would recommend looking into that.

If you want to keep the "Stock" drive ratio, you have to pull the trans out of a G6 or a 2005-2008 Malibu/Malibu Maxx.

If you want the GA's drive ratio then you have to pull the trans out of a GA (obviously) or you can get it out of the Cobalt, Vue, or Ion. Just depends how you want to do this.

Manwhore has a Grand Am transmission in his alero, it'll work fine.

Jawa: thats probably more work then hes looking forward to do.

jawa · 11-29-2012, 03:50 PM

Shiwnath · 11-29-2012, 06:18 PM

Quote:

Originally Posted by Nas Escobar

Ok, so after looking up the 4T45E, it appears that the Olds Alero has a different gear ratio than the Grand Am o.O

Apparently the GA has a 3.63 final ratio whereas the Alero has a 3.05 final ratio.

I don't think that's right. The Aleros and GA 3.4L both had 3.05 FDR except for the Grand am GT which was 3.29. Maybe the 4 cylinder Aleros/Grand Ams had 3.63, but I don't think they were offered in the V6s.

Also, to OP it's not worth throwing in a 4T65E unless you're really pushing the 4T45E.... The time and money it costs isn't worth it unless necessary.

Duval · 11-29-2012, 06:22 PM

Lol, thank you guys. So what I'm getting is find a tranny from a gdam or an alero no the sihlouette? Looking for cheap and simple

sleepyalero · 11-29-2012, 06:47 PM

yeah id do alero or grandam, since a ga is pretty much the same car, just changed body style and different interior, that would be easiest.

AleroB888 · 11-29-2012, 07:09 PM

Quote:

Originally Posted by Duval

Lol, thank you guys. So what I'm getting is find a tranny from a gdam or an alero no the sihlouette? Looking for cheap and simple

You'll be far better off getting another Alero trans from the same model year as yours, in any case do not go with an earlier year. Reputable salvage yards will be able to verify compatibility and mileage.

Redog · 11-29-2012, 07:22 PM

OK first the Tranny from the Van (4T65) will fit the engine on the Alero, however there is a lot of fab work required on the body/sub-frame end of it

The Alero has the 4T45 transmission in the V6, the 4 bangers got the 4T40 tranny. Same case, same tranny, but I'm willing to bet the internals are different.

The V6 Grand Am uses the 4T45 transmission with a 3.05 FDR, just like the Alero.

The Grand Am GT uses the 4T45 transmission with a 3.29 FDR.

The 3.61 FDR is used in the G6 V6 and the 4 banger gets a 3.90 FDR. Don't know if this is a direct swap due to mounting points in the body/sub-frame

Swapping in a GAGT Transmission is a direct swap, UNTIL you start driving it. All the gearing is the same but the FDR is different. Therefore the car's PCM will have to be reprogrammed with the correct FDR

Thank you and good nite

happyisthealero · 11-29-2012, 10:55 PM

Good to know redog mainly because I would like to do the same, and am glad you spoke of the reprogram.

Although I am surprised. What does the PCM have to do with the tranny, I thought it was mainly for the motor and all of its sensors.

On a side note which would be a better option for him the GAGT FDR 3.29 or the 3.61 from the G6V6? Wouldn't the higher 61 toothed gear better?

To finish up what plug in device would be best to do the reprogram?

Redog · 11-29-2012, 11:21 PM

I've been doing a of of reseacrh on this in the past.

The 3.61 is going to rev the motor higher than the 3.29 when cruising at highway speeds. For me I was looking at what the car is going to cross the finish line at RPM wise.

With the 3.61, in 3rd, I would be in the area of 5500 RPM's vs around 4500 area with my current set-up. I could leave it in OD for the run but the shift points are still going to be high. I figure with the cam I'm going to use, and the fact the car is going to rev higher and quicker, plus crusing RPM @ 70 with the 3.29 will be about 2350 vs 1950 with the 3.05 right now. It will make it a very nice street/strip car, and more than likely in the high to mid 13's no problem (after the rebuild). Plus top speed of my car with the 3.29's should still be in the high 130's which I will never hit in a 1/4 mile. With the 3.61's it's only in the high 100's which is possible to hit after the rebuild and better gearing, if my goal is 13 flat

If he has his motor built and is driving the car to the track, 3.29 is a good gear to have. If he's building a "street" racing car / Fast and Furious / or track only car, sure go with the 3.61, hell go 3.90. Of course your top speed is going to suffer the higher FDR you go.

There are tons of these calculators on the net. I always use the one that is gives you the speed at the RPM after you plug in all the numbers including tire size. I can't find that one right now. They are for RWD cars, but I found that for a FWD car, they are pretty close, but not dead on (maybe off by 300 RPM or so)