1964 - 1998 GM Torque Converter (3L80, THM325, THM350, THM400, THM425 Transmissions)

Top View of: GM 3L80, THM325, THM350, THM400, THM425 Torque Converter (1964 - 1998).
Top View of: GM 3L80, THM325, THM350, THM400, THM425 Torque Converter (1964 - 1998). Bottom View of: GM 3L80, THM325, THM350, THM400, THM425 Torque Converter (1964 - 1998).
PNH Number: 4601, Years: 1964 - 1998
Make / Model: GM -
Transmission: 3L80, THM325, THM350, THM400, THM425

The PNH Difference: High Quality & Dependability

We are true torque converter professionals. We do not just cut open used converters and weld them back together and call it good enough. If you want hasty, cheap, low quality converters—then PNH is NOT for you. Show More

How PNH Brings Relentless Quality to your Torque Converter:

  • Every single torque converter processed in our facility goes through an exhaustive checkpoint protocol to find EXACTLY why it failed.
  • Next, we implement numerous corrective actions to fix common failure points for each specific model. We see more torque converters in a single day than most competitors see in a year; which gives us a tremendous amount of insight and statistics to fully understand OEM design flaws. In addition to failure point corrections, we get to the root cause of the problems and implement changes so your torque converter lasts.
  • Converters are then thoroughly rebuilt with all the new and necessary corrective actions in place; ensuring future breakdowns don’t occur!
  • Precision is not just our name, it is what we do. The tolerances that we maintain during the rebuild process ensure you are getting the best of the best.
  • Our facility sets the bar on technology and process flow. Every single converter is built to exceed your expectations. Brand new components, high production efficiencies, so you get more for less.

When you get a torque converter from Precision of New Hampton, you are not getting "just" a torque converter! You are getting the BEST of the BEST!

Find out why we are the largest torque converter manufacturer in the USA.

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Core Return Options

Precision of New Hampton Performance Division Precision of New Hampton Performance Division

We are more than just OEM reman, we have a dedicated High Performance team that knows how to build converters that can handle as much horsepower as you can throw at it. If you want to finish first, let PNH’s Performance Division build you a state of the art torque converter. Show More

It is no coincidence why most first place race champions use PNH. Even though we build more billeted converters than anyone in the world, each converter is built to your exact specifications. If you know exactly what you want, we can do it. If you are not sure what you want, we can help make decisions for you to ensure your torque converter is going to hold up to your application.

Making performance converters takes both science and art. We have honed our craft; converters made in the High Performance Division of PNH are technological masterpieces. We understand the smallest nuances of your converter are relevant to your transmission build. And, we craft each performance converter to seamlessly transfer all the raw power of your engine. The result, like most racing professionals will tell you, is world-class speed and performance.

We know what it takes to get it right. Find out why Precision of New Hampton is the longest standing converter manufacturer in the industry. Get in touch with us, we’d love to hear from you!

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Shipping Label

Core Return Options

We can accommodate large orders that you may have. With over 1 million torque converters in our stock, we are sure to have what you need, when you need it. We want to show you why we are the world’s largest torque converter manufacturer.

Large orders may also qualify for a discount.

Our friendly, knowledgeable sales staff is here to work with you to handle your order. For bulk orders, please contact us.

Standard Features & Upgrades

Available Features & Upgrades

  • High Performance Friction Material
  • Furnace Brazed Impeller
  • Furnace Brazed Turbine
  • Heat Treated Sprags
  • Hardened Steel Hub
  • Turbine-Spline Reinforcement
  • Machined Forged Apply Piston
  • Furnace Brazed
  • Professional Computer Balancing
  • Extreme Clutch Upgrade
  • Flanged Impeller Hub
  • Anti-Ballon Plate
  • Multiple Clutch Options
  • Billeted Steel Cover
  • Billeted Turbine Hub
  • Extremely Tight Tolerances
Converter Stats & Specs

Torque Converter Specifications (Part #: 4601)

Manufacturer
General Motors 
Model / Engine
 
Transmissions
3L80, THM325, THM350, THM400, THM425 
Diameter:
13.000 
Pilot:
1.703 
Input Splines:
30 
Ring Gear Teeth:
 
Lock Up:
YES 
Hub Type:
slotted hub 
OAH:
6.150 
Bolt Circle:
11.500 
Mounting Type:
3 rect. pads 
Thread:
3/8" x 16 thread
Codes:
 
Comments:
w/o variable pitch, no bushing in stator 
Applicable Vehicles
  • 1964 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1965 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1966 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1967 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1968 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1969 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1970 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1971 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1972 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1973 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1974 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1975 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1976 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1977 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1978 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1979 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1980 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1981 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1982 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1983 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1984 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1985 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1986 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1987 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1988 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1989 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1990 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1991 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1992 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1993 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1994 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1995 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1996 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1997 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
  • 1998 General Motors (Transmissions: 3L80, THM325, THM350, THM400, THM425)
Shipping Information
  • Length: 13 inches
  • Width: 13 inches
  • Height: 8.5 inches
  • WEIGHT: 36 lbs
General Motors Logo

General Motors 3L80 Torque Converters

This page contains an extensive list of torque converters for the 3L80 transmission.

View 3L80 Converters »
General Motors Logo

General Motors THM325 Torque Converters

This page contains an extensive list of torque converters for the THM325 transmission.

View THM325 Converters »
General Motors Logo

General Motors THM350 Torque Converters

This page contains an extensive list of torque converters for the THM350 transmission.

View THM350 Converters »
General Motors Logo

General Motors THM400 Torque Converters

This page contains an extensive list of torque converters for the THM400 transmission.

View THM400 Converters »
General Motors Logo

General Motors THM425 Torque Converters

This page contains an extensive list of torque converters for the THM425 transmission.

View THM425 Converters »
Customer Testimonies

Bozeman Transmission Center, Inc.
(Bozeman, MT)

"As many of you know and have experienced, problems with torque converters can be frustrating and costly in more ways than just the money side of it. We, as shop owners, get to deal with that customer face to face, or worse yet the customer who has left your area and is now broke down. Not to mention down time, a bind in your shop's work flow and everything that goes with a converter failure. I have owned B.T.C for 20 years with 30 years in the business. Since I have started using Precision Torque Converters almost 10 years ago, my torque converter problems have dropped dramaticly.

What I like besides the service and quality is the fact they are constantly improving their product line. They genuinely care about their customers. With A.T.R.A.'s new and longer warranty program I feel completely at ease installing Precision Converters in our units. Simply put, you couldn't offer me enough money to change supplier's.

After 30 years in this business, I know what works and what does not, and Precision Torque Converters work."

-Kevin R. Kunze


Brown's Auto Service, Inc.
(Billings, MT)

"I know you don't get this very often but I just wanted to take the time to let you know that you have one very happy customer in Brown's Auto Service, Inc. Milt Freese and the rest of your crew do an excellent job of making sure of that. We have been using your converters now for almost 14 years. Over the last 48 years of rebuilding transmissions we have used many different converter manufacturers. Never before have we used one for 14 years. In an industry where the converter is blamed for more than its share of problems, you have listened to our issues and helped us to resolve them in very positive ways.

Our goal is not to become a transmission company that sells the most units, has the most builders, or even one that has the lowest price. We would rather be known as a company that sells high quality products and services. To achieve these goals, we have had to form strategic business alliances with vendors such as yourself to assure that our customers are getting the highest quality product available.

Our philosophy is different from many in our industry in that we believe that price is not the most important factor in the selling of our repair services or our transmissions. Our business philosophy focuses on four main areas - CRAFTSMANSHIP, PARTS, SERVICE, & LOYALTY. To be able to live up to this business philosophy we live and die based on the relationships we develop with companies like yours. Needless to say because of the strategic business alliance we have with Precision, our company has been doing extremely well.

Over the last ten years most companies in our industry have merged, gone out of business, or just simply disappeared. It is very reassuring to know that Precision of New Hampton has been there for our company and will continue to be there tomorrow. Once again thank you for the great service that your company provides our company."

-Gordon Tryan


D

D and E Automotive Products
(Toledo/Holland, OH)

"I've been in the automotive industry for 20 + years. Seen a lot of companies come and go, even worked for a few of them. To do business with a company that stands behind their products is reassuring to us as a supplier and is the best insurance any shop could ever ask for.

We've HAD other converter suppliers, that's past tense for a reason. When I ask my customer if they would rather wait for a Precision if I do not have it in stock, most prefer to do so. Their ability to get me next day service helps keep my inventory from growing on hand to find units, the quality second to none.

I used to have two bins before, one for cores, one for defects. Not any more, my customers see the quality they know we stand behind what we sell and so does our supplier. Tech bulletins, tech service, and a quality product that has helped reduce our warranties to virtually none. Price is only an issue to someone who can afford to do it more than once.

The bitterness of poor quality persists long after the sweetness of low price is forgotten. That's how you determine value."

-Craig Budzinski