what year models are best to get it from, im looking for something with relatively low gearing, like a 3:33 or 3:69 something lower than say a 4.5L caddy would have had, the 85GT currently has a 3:33 3 speed auto in it, and the local junkyard said that the 440t4's had different electrical connectors depending on years and car, so does anyone have any suggestions on what i should use, im assuming something from a 2.8L would have the lowest gearing, just need some suggestions on what works.

i already know about the pontiac 6000 light duty axle and the fiero manual trans axle to make it work.

matthew

Not sure about where the 440T4 became a 4T60E, but on the list that Darth posted, the 4T60Es that had the lowest gearing (3.73?) were the ones that came with the 3.4 TDC.

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Raydar
88 3.4 coupe...........

Coming soon...
88 Formula, presently under the knife.
Read Nealz Nuze!

im not even sure it was called the 440t4, it may have been called the th440

maybe someone can correct me.

matthew

Here's a webpage that shows the gear ratios, final drive ratios and other specs for the 125c and the 440t4 (4t60)

http://snowcloude.com/TurboFiero/FIERO-4T60.html

If you want a THM440-t4 then Id go for an '89 model... they are different mechanically from the '88... the '89 has a ball bearing under one of the clutch packs where the '88 has a bronze bushing. There is a difference in the valve bodies electronically, I think perhaps allantes (eldorados/sevilles didnt) had a VCC sensor. There are two different speed sensors.

I have an '89 with 185k miles I just pulled out, clutch packs were well worn and it leaked, just needs a rebuild. You can have the trans for close to free if you want... I live in yorktown, va...

PM if you need more info. on the differences between '88 and '89 THM440-t4 or want to come pick up that trans.

Regards,
Brian

PM sent

there has to be more forum members with info on this stuff.

links?

matthew

Foxgapfiero is working on project of this nature. You might want to send him a PM. He's pretty knowledgable on soem of the ins and outs of the project. Keep the project going becuase I'm taking notes for my own transmission swap.

88Ironduke

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Pilots with out maintainers are just pedestrians with a cool jacket and sunglasses.
I.Y.A.M.Y.A.S.

the information i have is getting me absolutly no where, i went to the junkyards and looked at the transmissions they had, and i found one from a 89 grand prix that had the 3:33 ratio, however, the speedo connector and the transmission plugs were different, it had wires out on the neutral safty and gear select thing, im not sure if thats something id have to addapt or what, either way i want to hear you guys tell me what to do, someone has to have swapped in one of these transmissions before, i just want to know some real world answers, and WHAT TRANSMISSION DID YOU USE? what car was it from, im almost ready to start changing the 2.8L out for the 3.4L and i want to have the transmission right before i start.

matthew

Mosh, I'm going to some yarding in a few weeks to find the trans I need. From what I have been told the 92 cars like a 3.1 Prix or a more performace car like that would have what I am looking for, 3:33 ratio. I have a list of codes at home and I did get some great info from the Space Coast site. The guy at the local trans shop had a book with all the ratios and the engines they were hooked to. It is just a matter of crawling in engine bays and getting the codes off the trans............ Oh Boy.....

Hi Mosh,
Wish I was still in WV with you! My wife is from Glen Ferris and we lived in Putnam county (Red House) for 6 yrs and I miss it.
86FieroEarl in Orlando just pulled a th440 out of his 86 and replaced it with a 5 spd -- send him a PM maybe he can help you.
did you go to www.Fieroaddiction.com ?
Have fun be safe

Jeff

There is no drop in solution. You will have to do some electrical work and posibly some mechanical work on the trans. That is on top of the axles mounts etc.

In all cases, you will have to use the control plug for the 4T60 on hand. None of them accept the TH125C TCC plug that I know of. You may also want to wire the pressure switches to prevent TC lockup in low gears. You need to get those plugs from the donor car.

You may have to switch the neutral safety switch and/or VSS depending what vehicle the donor is. Far as I know those are easy to change.

There is a link in the trans conversion article (options and projects area) in my cave that explains one change that seems rather easy. I still haven't had the time/money to change mine.

The gear ratio article in my cave tells you how to read the RPO codes to see what trans is suposed to be in the vehicle. All cars 87 and later have the last part of the VIN stamped into the trans so if the thing was replaced it should be easy to tell. The vin is usually stamped on the top of the valve body.

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The only thing George Orwell got wrong was the year...

The Ogre's Fiero Cave (It's also at the top of every forum page...)

ok, well the donor trans i was looking at is from a 89 grand prix 3.1L it has wires out of it instead of the plug like the fiero, so imguessing that canbechanged over, ive got a 4t60e from a 92 lumina 3.4L DOHC car, i know its electric shift, soi cant use that, so if i trade thejunkyard for the th440t4 from the 89 grand prix i should be able to get it to work right? i know there will be stuff i have to change im not worried about that, i just dont want to get a trans that cant be electronically changed to work in my fiero.

matthew

The wiring for the tranny is not a big deal. The neutral switch connector will need to be spliced into the Fiero harness- the wiring colors are the same on the 2 that I have swapped. The TCC connector will be different and it will more than likely have 2 more wires than the Fiero connector. They are for the 3rd and 4th gear switches and can be left disconnected or you could wire them in such a way that the converter would only lock in 4th gear. The actual TCC wires are the same color on both transaxles. More than likely, a later model 4t40/4t60/440t4 will have a high resolution speed sensor. I found one from a mid 80's Caddy that was a low res (like the Fiero) with the correct connector. One problem with mixing and matching tranny parts is getting the shift timing right. The wrong governor for your engine/tranny combination can make for poor driveability. Example- a 4.5 Caddy governor will have your high winding 2.8/3.1 shifting at around 4500 RPMs at full throttle. Mismatched torque converters will also make the the driving experience less than pleasurable. A Caddy converter on a v6 will probably have a stall speed of about 1100 rpms while a v6 converter on the v8 will get a stall speed of around 2000. There are websites with the converter codes and stall speeds listed, make sure you get a good match for your engine and driving style.

thanks cooter thats what i wanted to hear, if i can get the 89 grand prix trans to work, ill see if he will trade it to me.

if i used the torque converter from a 92 lumina 3.4L DOHC, what would that make my trans shift at, at WOT.

matthew

TC ID info is also in my cave. It includes the info to read the tag on the TC.

The torque converter does not change your shift points, different converters have different amounts of slip. A high torque, low RPM engine wants a low stall speed. A high revving, lower torque engine likes a higher stall speed. Vehicle weight is also a factor in selecting stall speed. I've got a V6 Cavalier converter in my Caddy powered Fiero and it stalls to about 2100 RPMs. It makes smoking the tires very easy but sucks on the drive through town because the engine just hangs at 2000 rpm all the time until the converter locks.To get the shift points right, you need the right governor for your engine. There are shift calibration kits that let you swap springs on the governor to tailor it to your engine/vehicle.