TQ ratings?

[vega]

So does anyone know the TQ ratings of the following engines? I can'st seem to find them anywhere...

thm125c
4t60
4t60e
4t65e
4t65e hd
4t80e

The stock getrag 5 speed
The stock 4 spd from say an 85 gt v6. (i don't know what 4 speed that is)

And do any of these no hook up to the 3.4 ohv pushrod fromteh firebird of 92-95?

[SHOoff]

Those are transmissions, BTW. But I only know of

4t65E-HD is rated at 280ft/lbs. Which strangely enough is the same as teh L67 makes. Though guys can push the cars down to 12s on the stock tranny, so it'll take a fair bit more.


I think the 4spd is an Isuzu. I dont know about it, but the Isuzu 5spd i've heard word that it's rated at 225 ft/lbs if taken care of properly.

These are all FWD transmissions. I think they'll still mount to the 3.4. But you'd probably be better off with the FWD version of the V6 if going with a FWD platform. Plus you get more hp with the 3400.

[Syn]

the getrag 5speed has been proven to hold 300-350 h/p and many 12 sec passes.

[vega]

So what is the best getrag 5 spd out of a what regardless of what it may cost?

[geoffinbc]

The 2006 4t65E is rarted for 400LBS of torque. I don't think previous years were this high. But they have always been rated well over 300lbs. They were never rated at 280lbs that is the maximim engine torque rating from GM. To know what the tranny can handle you have to read the Maximum Gearbox torque rating.

[SHOoff]

Where can we look up something like that?

I thought I read on ClubGP or something that GM rated the 4t65-hd at 280 which was a weird coincidence with the GTP's stock power output. If they really do, its WAY underrated for sure. 12's in a 3500lb car on a stock tranny obviously is pushing a bit more than 280 ft/lbs. So, I do believe what you're saying.

[Azrael]

The 4T65E-HD must be underrated as I've also seen the 4T60E rated for 280lbs/ft maximum.

[vega]

Well i am also not just interested in the tq ratings of the trannies but the hp loss as well. if you go to the link it is not a matter of percent that judges this it is the how much it takes to turn the tranny and that will never change.

http://www.fiero.nl/forum/Forum2/HTML/070969.html#lastpost

[RacerX11]

Oreif is out in left field with his "constant power loss" theory. The power loss through a transmission does depend on the power of the engine.

Marty

[vega]

Read the last page he changes his mind for he admited he was wrong. You are correct- that he was in the left field on the first page but talking to the dyno shop- he found out the truth for everyone.

[RacerX11]

Read the last page he changes his mind for he admited he was wrong. You are correct- that he was in the left field on the first page but talking to the dyno shop- he found out the truth for everyone.

Found out the truth? LOL More like he admitted what other people were telling him was right, and he was wrong.

[vega]

well i have been doing some more searching and i found this the following. Although i have a question is it the enigne tq or the gear box tq that tells me how much the tranny can handle?

The headings for the chart are: (left to right) - Transaxle Weight, Engine Torque (lbs/ft), Gearbox Torque (lbs/ft), Gross Vehicle Weight, Overall Converter Diameter. - ALL ARE LISTED AS MAXIMUM SPECS
An example of the first on the list (TH-125) is 161lbs - 200lbs/ft - 316lbs/ft - 5100lbs - 9.64 inches
Front Wheel Drive:
|--------Maximum Ratings-------|

Model Weight Engine Torque Gearbox Torque Vehicle Weight Conv Diam.
(lbs.) (lb/ft) lb/ft) (lbs) (inches)
__________________________________________________ _________________
TH-125C (3T40) 161 200 316 5100 9.64
TH-440-T4 (4T60) 195 235 369 5181 9.64
4T60-E 203 280 390 6400 9.64
4T65-E 214 285 400 6400 9.64/10.16
4T80-E 295 305 461 6800 10.43

[torq455]

dude! where the hell did you find the 125 specs? I've been searching for a long time! Thank you, thank you!!!! now, can we all figure out what engine torque is and gearbox torque is? maybe when the engine shifts and lurches the car is box torque? What about the 4T45E?

[SHOoff]

Betterthanyou posted that some of the earlier models of the 4t65-HD were rated a bit lower. If I had to guess, that would be the 97 tranny. The 97 uses a smaller output shaft than the 98+. When you buy an LSD, you have to upgrade to the 98+ output shaft on the 97 tranny.

[geoffinbc]

dude! where the hell did you find the 125 specs? I've been searching for a long time! Thank you, thank you!!!! now, can we all figure out what engine torque is and gearbox torque is? maybe when the engine shifts and lurches the car is box torque? What about the 4T45E?

Engine torque is simply stating the most amount of torque that the transmission sees in a GM application. The gearbox torque tells you what the trans is rated for. This is the figure you want to know in order to determine if it should hold up behind a particular engine.