Topic: How much torque can the auto trans take

[wawa]

Hi everyone,
How much torque can the stock GXP auto trans take before I need to upgrade the internals. 

Thanks,
Dave - Wawa
09 wicked GXP

[Filipp]

Think I saw someone post saying the auto trans was strong enough for 400-500. Forgot exact # though.

[Sly Bob]

I do know that if you get the GMPP upgrade with the auto you get 325 lb feet of torque but if you have a manual you get 340.
 
I would assume that's because of a limitation of the tranny. Maybe not a hard limit but a limit as to where it will operate reliably. Just a guess on my part.

[DeepBlueGXP]

I believe it is 550, can't remember where I saw it though. 

[chuckdoc]

The reason for the difference in torque is do to drive train loss, it is not scaled down at the flywheel, just a mater of physics. 

I am running a crap load of torque and no problems to date.  No way to get accurate dyno results due to reasons someone else can explain.

The answer will come from the track, just this has been a really bad summer for me, hopefully I will be back in shape soon and can make a trip to the strip.

[lil goat]

It is the same auto used in a Colorado 4X4 pick up truck, so I doubt you will ever have an issue with it. It is a very tough auto, and the problem on the dyno Chuck was speaking of is caused by the stall converter, there is no way to lock the auto into 4th to get a good reading. Chuck we have missed you, hope everything gets better.

[kennysabarese]

gminsidenews.com says the following, but I am not sure how accurate this is

Hydra-Matic 5L40-E Transaxle

Type: five-speed rear-wheel-drive, electronically controlled automatic overdrive transmission with torque converter clutch.
Engine Range: 1.8L-3.6L (gas or diesel)
Hydra-Matic 5L40-E Transaxle
Max Gearbox Torque: 494 lb.-ft.
Weight: 182 lbs.
Assembly Site: Strasbourg, France
Applications: Cadillac SRX, Pontiac Solstice, Saturn Sky, Opel GT, Daewoo S2X

The site says that the Colorado uses the following AUTO:

Hydra-Matic 4L60-E/4L65-E

Type: four speed rear-wheel-drive, electronically controlled, automatic overdrive transmission with torque converter clutch.
Engine Range: 2.8L-6.0L
Max Gearbox Torque: 600 lb.-ft.
Weight: 163 lbs.
Assembly Site: Toledo, Ohio
Applications: Chevrolet Colorado, Trailblazer, Silverado, Tahoe, Avalanche, Suburban; Cadillac Escalade; GMC Sierra, Yukon, Yukon XL, Canyon, Envoy Denali; Hummer H2, H2 SUT, H3; Saab 9-7x

Here are the MANUAL specs just for comparison, you can see here is where it says we share the same transmission with trucks.

Aisin AR-5
Type: rear wheel drive, five-speed manual transmission.
Engine Range: 2.8L-3.5L
Max Gearbox Torque: N/A
Weight: 107 lbs.
Applications: Chevrolet Colorado, GMC Canyon, Hummer H3, Pontiac Solstice, Saturn Sky

SOURCE: http://www.gminsidenews.com/index.php?page=trans_guide

[Sol Asylum]

I like how the Aisin doesn't include our engine size(s) in the specs.

[wawa]

wow, those are great numbers for the auto trans..
Thanks
Wawa

[chuckdoc]

Thanks jim, it has been slow with my back but it now only
hurts in am.  I finally broke down and took some
meds.  I will never tell back patents again that it is a
mental problem. 

[kennysabarese]

the problem on the dyno Chuck was speaking of is caused by the stall converter, there is no way to lock the auto into 4th to get a good reading.

I found this interesting explanation that sounds right

http://forums.land-and-sea.com/showpost.php?s=4e8464e50b528b6c55dfaefb747ed368&p=2006&postcount=3

[GXPinKC]

Thanks kennysabarese for posting.  Great points made in the article.  Definitely a good read!