HP increase with stock trans?
Thread Starter
Instructor
Joined: May 2010
Posts: 237
Likes: 0
From: Albuquerque NM
HP increase with stock trans?
I was wondering how much HP increase you can get away with before you have to start building up the 4l60e?
I had the 4l60e in a silverado that I supercharged and I blew that trans apart..... literally... I understand that I was pushing double the weight in the truck and gearing and weight distribution and so on but that trans couldnt take 550HP.
I plan to put this car to about 450 at the wheels and didnt want to find out the hard way again
I had the 4l60e in a silverado that I supercharged and I blew that trans apart..... literally... I understand that I was pushing double the weight in the truck and gearing and weight distribution and so on but that trans couldnt take 550HP.
I plan to put this car to about 450 at the wheels and didnt want to find out the hard way again
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
I ran 414 NA (unlocked TC on A4) and 563 sprayed for several years with no issue. HOWEVER, I only went to the track twice, and didn't beat on it that much on the street, although I am running 305 Nittos.
I'm around 700rwhp now and have made MANY full throttle blast, but it's a matter of time
I'm around 700rwhp now and have made MANY full throttle blast, but it's a matter of time
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 327
From: CA.
St. Jude Donor '13-'14-'15
I think anything over 350 RWHP on a car with miles will eventually go with poor or racey driving habits--- Too many WOT shifts from 2-3 & 3-4 will hurt a stock trans---Even more so are the WOT downshifts from 3-2 or 4-2 where bands unlock and clutches engage at the same time- When rebuliding you can lenghten life and add reliability by using the "Beast" sunshell and installing the "Z" pak 3-4 clutch kit ( the weakest paart of a 4L trans )
PS: getting the trans temps over 200* for an extended time shortens life quickly as well
PS: getting the trans temps over 200* for an extended time shortens life quickly as well
Last edited by tblu92; Nov 5, 2010 at 12:59 PM.
Melting Slicks
Joined: Feb 2007
Posts: 3,176
Likes: 10
From: New Smyrna Beach Florida
This is a good question and has been discussed many times. You can do a search read through responses. I've been running H/C gears and stall converter for a couple years now and no problems thus far. Made 20 plus passes down the strip and I get on it at least once virtually every time I drive the car. I do have a stacked plate tranny cooler and that probably helps some. If it blows, RPM to the rescue.
Former Vendor
Joined: Aug 2009
Posts: 1,184
Likes: 1
From: delware county pa
there is so much to upgrade on that trans, its very easy to turn it into a beast you can spent around 500-600 in parts and have her last a very long time. but its all in the better parts
