How much TQ can 4l60E handle?
Thread Starter
Launching!
Joined: May 2004
Posts: 295
Likes: 0
From: Dallas, Tx
How much TQ can 4l60E handle? Im starting to wonder how much torque the trans itself will handle? I know there are many factors that one must take into account such as tire quality, stall, cooler or nor, racing.
TECH Regular
Joined: Feb 2004
Posts: 439
Likes: 1
From: burbank ca
4l60
Originally Posted by F1_SS
Im starting to wonder how much torque the trans itself will handle? I know there are many factors that one must take into account such as tire quality, stall, cooler or nor, racing.
The "60" I believe denotes a (nominal) 600lb-ft
input shaft torque rating. This being the engine
output (flywheel) torque times whatever torque
multiplication you are getting off the converter
at any given time.
With the stock engine (say, <300lb-ft down low where
the converter is swinging through stall / Tq mult) and
converter (1800/1.8 STR) you're likely OK forever -
and GM engineering is clean from a warranty odds
point of view.
Now throw a 2.5:1 STR, 3500 RPM stall converter
on there and run the engine up to its torque peak
(maybe over 350lb-ft on a healthy car) and you
are well over the design rating, well into whatever
design margin might still not have been "value
engineered" out of the system - 800-900lb ft
onto a 600 lb-ft rated design - "do I feel lucky"?
This is where the super-duty input-end components
come in, on a well-built performance transmission.
input shaft torque rating. This being the engine
output (flywheel) torque times whatever torque
multiplication you are getting off the converter
at any given time.
With the stock engine (say, <300lb-ft down low where
the converter is swinging through stall / Tq mult) and
converter (1800/1.8 STR) you're likely OK forever -
and GM engineering is clean from a warranty odds
point of view.
Now throw a 2.5:1 STR, 3500 RPM stall converter
on there and run the engine up to its torque peak
(maybe over 350lb-ft on a healthy car) and you
are well over the design rating, well into whatever
design margin might still not have been "value
engineered" out of the system - 800-900lb ft
onto a 600 lb-ft rated design - "do I feel lucky"?
This is where the super-duty input-end components
come in, on a well-built performance transmission.
Thread Starter
Launching!
Joined: May 2004
Posts: 295
Likes: 0
From: Dallas, Tx
Originally Posted by Pro Stock John
I was doing 475rwhp/505rwtq locked with my FLP IV and it worked great.
TECH Enthusiast
Joined: Mar 2002
Posts: 630
Likes: 0
From: York, PA
a stock tranny, you dont want to go over 400ftlbs at the rw. I did that and it toasted... Although, I've seen people who don't rag them out run fine with 400ftlbs... Heat is what kills them most of the time... keep the temps down they should be ok... Personally, I say if your goals are over 500 then get rid of the 4l60 all together... I know I am.
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