Welcome to 4L60E Transmissions. 4L60E Transmissions offers a quality rebuild service for the General Motors 4L60E family of transmissions. They include the 4L60E (M30), 4L65E (M32), and 4L70E (M70) transmissions. My goal is to provide an honest, quality, rebuild service for these transmissions at a fair price and enjoy my work in the process. I use new, brand name parts that are known for their quality and perform the rebuilding procedures with much care and pride.
This family of electronically controlled automatic 4-speed overdrive transmissions are in many General Motors rear wheel drive vehicles from 1993 up through 2014. They are strong and reliable transmissions that will give good service up to and over 150,000 miles if maintained and treated properly. Many OEM and quality aftermarket parts are available, which makes rebuilding these transmissions a common economical alternative to buying a replacement. I have worked in the performance camshaft manufacturing industry most of my life, but I enjoy working with anything mechanical and that includes automatic transmissions. The 4L60E family of transmissions have become my favorite and I have chosen to specialize in them. These are the only transmissions that I currently work on. I have tried to give detailed information on my transmission services, please read carefully through all of the pages.
The old and dirty transmission in the photo above is my own 1993 4L60E with 265,152 miles before being rebuilt. It was slipping and having problems when I decided to rebuild it. The transmission had been well cared for and the inspection showed no major issues. My standard rebuild service along with some added components got the transmission back in great working condition.
The pictures below show my standard rebuild service. Click on any picture to enlarge it.
This family of electronically controlled automatic 4-speed overdrive transmissions are in many General Motors rear wheel drive vehicles from 1993 up through 2014. They are strong and reliable transmissions that will give good service up to and over 150,000 miles if maintained and treated properly. Many OEM and quality aftermarket parts are available, which makes rebuilding these transmissions a common economical alternative to buying a replacement. I have worked in the performance camshaft manufacturing industry most of my life, but I enjoy working with anything mechanical and that includes automatic transmissions. The 4L60E family of transmissions have become my favorite and I have chosen to specialize in them. These are the only transmissions that I currently work on. I have tried to give detailed information on my transmission services, please read carefully through all of the pages.
The old and dirty transmission in the photo above is my own 1993 4L60E with 265,152 miles before being rebuilt. It was slipping and having problems when I decided to rebuild it. The transmission had been well cared for and the inspection showed no major issues. My standard rebuild service along with some added components got the transmission back in great working condition.
The pictures below show my standard rebuild service. Click on any picture to enlarge it.
transmission in the beginning stages of disassembly
disassembled transmission is organized into groups (the beach towel is very important in the rebuilding process)
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bare case with bell housing and tail housing are degreased, inspected, new bushings and seals installed
valve body is completely disassembled and inspected
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electrical components are inspected and tested
wiring harness is disassembled, inspected, and tested
2-4 servo is rebuilt with new seals
low/reverse roller clutch is disassembled and inspected
pump is completely disassembled, inspected, and rebuilt with new bushings, seals, and filters
forward sprag clutch is disassembled and inspected
input drum is rebuilt with all new clutch packs, bushings, and metal pistons with bonded seals
reverse input drum is rebuilt with new clutch pack, bushings, and seals
new low/reverse clutch pack and seals are installed
To sum it up, my standard rebuild service consists of the transmission being disassembled, cleaned, inspected, and reassembled with all new gaskets, bushings, seals, clutch steel and friction discs, fluid filters, the band, and a remanufactured torque converter.
12-quarts of synthetic transmission fluid are also supplied
There is much more information, please continue on.