4t65e

Posted By admin On 29.04.21

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Transmissions and Torque Converters

4T65E-HD MN7 Transmissions and Torque Converters

Two major components of the car reside along the drivetrain between your engine and your wheels -- the transmission and the torque converter. LS4s come from the factory mated with 4T65E-HD MN7 transmissions; they're automatic transmissions that have 4 forward gears, are transverse mounted, come rated to 6,500 lbs, and are electronically controlled.

The 'HD' stands for Heavy Duty. Otherwise, they're based on GM's 4T65E transmissions, but with some beefing up of various components. MN7s come from the factory with upgraded input and final drive sun gears, carrier assemblies, and upgraded drive sprocket thrust washers. Additionally, MN7 have modified cases for relocated starter mounts.

4T65E-HD MN7s are rated from the factory at 280 ft-lbs of torque on the engine side, 400 ft-lbs of torque on the gearbox side. However, LS4s come from the factory rated at 325 ft-lbs of torque at the crank. Some have speculated that this may lead to long-term sustainability issues for stock transmissions. Unfortunately, there are hundreds of cases of transmission demise. My stock transmission -- even with life-prolonging upgrades -- broke down after 45,000 miles.

Final Drive	2.92:1 or 3.29:1
1st gear	2.92:1
2nd gear	1.56:1
3rd gear	1.00:1
4th gear	0.7:1
Reverse	2.38:1

Fortunately, Triple Edge Performance (TEP) has both stock and upgraded transmissions and torque converters available for sale. Their stock transmissions have been thoroughly inspected and comes with new seals, gaskets, o-rings, Teflon sealing rings, Borg Warner clutch plates, thrust washers, stator support bearings, input sun gear, valve body solenoids, and a transmission filter that's made in the USA.

Their high-performance street / strip transmission comes with the standard upgrades, plus new 4th clutch input shaft, friction plates / backings, drive chain, and more. You can also upgrade the input shaft, drive chain, and a custom clutch pack.

In addition to their transmissions, you can purchase replacement transmission coolers. Triple Edge Performance has several basic coolers available on the web site, but they also have another unit that's not listed -- a Tru Cool Max 4920 transmission cooler kit that comes with all of necessary hoses with AN fittings. This cooler can be top-mounted for use with a front-mounted intercooler should you ever decide to go forced-induction.

Also, Triple Edge Performance has a range of torque converters available ranging from stock replacement up to a custom, high performance torque converter with custom stall converter and custom billet cover that will bolt to stock LS4 flexplates without modification. The high performance torque converters are rated to over 1,000 horsepower and come with a full 5 year warranty. They can even customize the stall speed at no charge any time within the warranty period; all they ask for is the shipping cost.

I realize that I sound like I'm out to talk up Triple Edge Performance. I'm excited about their product because it's absolutely immaculately prepared, because I've heard from hundreds of individuals who have gone with TEP and are absolutely thrilled with the purchase. During my conversations with Dave Norris, the owner of Triple Edge Performance, I came to quickly come to understand that he knows these transmissions inside and out. Moreover, in addition to the time, quality, and attention to detail Dave puts into these transmissions, he's also a great guy and an honest businessman.

That said, be prepared -- word has gotten out about the quality of Dave and Triple Edge Performance's work and he's now very, very busy. As a result, it may take some time between when you place your order and when the parts arrive. Don't worry -- you'll get your parts.

After my stock transmission died, I went with the fully-built performance transmission, the high performance torque converter, and the transmission cooler kit. Triple Edge Performance crated and shipped the transmission via freight to a local transmission shop. The local shop took a few days to install the new parts and then shipped the old transmission back to TEP. When I originally purchased the parts, I also paid two-way freight plus a core charge.

I've got to say.. I absolutely love this transmission. Dave dialed it right in to exactly what I wanted. The 1-2 shift is much less than 1 second now -- it feels more like going over a seam in the road than a change in gears. It takes about as long for me to say 'pop pop' quickly as it does to change gears. It's crazy -- the car just doesn't stop accelerating.

The last thing I'm going to say on the topic is this -- even with a stock engine, there are hundreds of examples of 4T65E-HD MN7 transmission failing. Add performance parts (exhaust systems, headers, etc.) and one could guess about what will happen to the life expectancy of the transmission. However, with Triple Edge Performance's built-up drivetrain components, there are many who regularly race their LS4s after having thrown turbochargers, high performance cams and valvetrain components, nitrous oxide, and more at these transmissions.. and they're doing just fine!

4t65e/m15

The 4T65E is for the most part a fairly reliable transmission. It is the successor to the 4T60E. Variations of this transmission have been common since the 1980’s. By the 2000’s most of the kinks were worked out. But, like everything else, it’ll break and wear out with mileage and time. So without further fanfare, here are some of the most common 4T65E Problems.

Before you go any further with your 4T65E diagnostic quest, make sure to hook in an OBDII reader if the service engine soon/transmission light is on. The advanced diagnostics built into modern cars will often tell you the exact part that may need replaced, saving you a load of time.

4T65E Transmission The 4T65E transmission is a 4-speed transverse electronically controlled automatic transmission first manufactured for GM vehicles in 1997. The 4T65E transmission was featured in the Lumina, Impala, and Pontiac Grand Prix among other vehicles.
4T65E Rebuild Parts, A full line of GM 4T65E Transmission rebuild parts, upgrades, and tech support. Transmission Rebuild Kit Grand Prix, Impala, Monte Carlo.

Certified Transmission offers the following resource for those interested in knowing vehicle applications for the remanufactured 4T65E transmission. To view applications begin by selecting the vehicle manufacturer listed below. Buick Chevrolet Oldsmobile Pontiac Saturn Volvo.

4T65E Transmission The successor to the 4T60E, the 4T65E, like all upgrades, made changes to improve upon its previous incarnation. One such was a larger torque converter in order to increase the stall. All transmissions of this model also received a new valve body to. Whether you need 4T65E wiring diagram information, 4T65E transmission rebuilders tips, 4T65E technical information, 4T65E diagnostics, 4T65E troubleshooting help, or just answers to your 4T65E transmission rebuilders question, the Transmission Rebuilders Network is the place to go!

Only 1’st, 2’nd, and Reverse Work

If you have a situation where Drive and 3’rd gear stop working entirely, you know how terrible it is to drive home with your vehicle screaming down the highway. The situation is most likely going to be caused by a broken forward apply band.

Harsh or Jarring Shifts

4t65e-hd

One of the most common issues with the 4T65E is that it’ll suddenly start shifting really hard. There are a few different issues that can cause this. The good news is that it usually throws a trouble code. The most common code is P1811.

P1811

In my experience, this is the most common code that registers for this problem. The ECM will begin registering this code whenever it detects shift times that are outside of its normal operating parameters.

Once the code is thrown the transmission will begin to operate at maximum line pressure. While not a full limp mode, the transmission at full line pressure shifts incredibly hard. The reasoning for this is the shorter shift time will save the transmission

The real problem with harsh shifting is that many issues can cause it. Most of them have to do with the transmission being just wore out. Here are the most common ones.

MAF sensor causing the transmission lower command line pressure to be to low. This creates sluggish shifts do to lack of pressure.
Valve body wear.
Clutch wear.
Bad Pressure Control Solenoid.
Worn or bad seals and rings.

Here’s a great video all about what causes the P811 code.

4t65e Fix

Won’t Move In Any Gear

If your 4T65E doesn’t move at all whenever you put it into gear, it’s a good idea to start with the transmission fluid. It could be out or extremely low. Get to know the signs of low transmission fluid so that it doesn’t happen again.

A broken shift linkage could also be responsible for the vehicle not moving in gear. This is espescially worth considering if you recently had some ice or a hard freeze. The linkage can freeze. It’s not very common, but it certainly can. Typically, when this happens it should feel like the shifter is stuck until you break it free. But what has really happened is the shifter has been pulled off of the linkage.

Won’t Move When Warmed Up

This has to be one of the most baffling things that can happen to someone. The scenario would be that the vehicle works fine when cold, but whenever it warms up, the transmission just stops working.

This is most commonly cause by the damage to the transmission filter caused by damage to the torque converter. It’s a chain reaction that can leave you stranded. The maddening thing is that the 4T65E will work fine again when it gets cold.

Reverse Failure

Reverse hardly ever fails on these transmissions. When it does, it’s almost always something that you’re going to have to open the transmission up to investigate. Here are the most common issues that may cause reverse failure in the 4T65E include:

Reverse Apply Servo- Sealing lip seal may be failing
Reverse Boost Valve- Worn so much it’s stopped engaging

Conclusion

4t65e Valve Body Diagram

These are some of the most common issues and problems with the 4T65E. If you have a question I might be able to answer feel free to leave a comment or use the contact page. Remember, while these are the most problems and solutions, there are any number of less common things that can cause the same issues. When in doubt, take it to a professional.