Grid Solutions, a GE Renewable Energy business, serves customers globally with over 13,000 employees. Grid Solutions provides power utilities and industries worldwide with equipment, systems and services to bring power reliably and efficiently from the point of generation to end power consumers. Our specialties are the TH350, TH400, 4L60, 700R4, 4L60E, 4L65E, 4L70E, 4L80E, 6L80E, 6L90E and 2 Speed Powerglide transmissions. We also do trans-brakes for you Bracket racers out there and have done transmissions for many vehicles on the Power Tour. For those racers who also use their vehicle for Street to Strip we got you covered too.
- Home »
- Catalog »
- Transmission »
- Built Transmissions
Browse Built Transmissions Products
Built Ford Tough.
The 4 speed toploader is one of the toughest manual transmissions ever built.
Identification of the Toploader is easy. Toploaders are top accessible (from a 10 bolt steel plate)
For decoding the specific application look for a metal tab riveted on the right side of the transmission body housing.
HEH-? or RUG-? are the codes necessary for decoding specific transmission application from the
Close and Wide Ratio
2 types of gear ratio are commonly associated with the 60's 70's toploader
Ratio type | 2 nd | 4 th |
2.32 | 1.29 | |
Wide ratio | 1.93 | 1.00 |
Ratio chartpage gives a good idea of rpm, speeds and shifting points for both Close and Wide ratio transmissions.
Decoding the Toploader
For most 60's and 70's Toploaders the ID starts with either prefix HEH or RUG
HEH-D | Transmission identification code HEH-D = 64 390 Galaxie, 1 1/16' input shaft, 28 spline output, close ratio |
| Transmission serial number | |
RUG-AV1 | Transmission identification code RUG-AV1 = 70-71 302-351 Mustang, 1 1/16' input shaft, 28 spline output, wide ratio |
| Transmission serial number |
The lower number on the tag is the transmission serial number. The transmission serial number is a production serial number and should not be confounded with the engine serial number, they are not the same. Some transmissions have a date code instead of the serial number.
Input Shaft
2 different INPUT shaft are commonly available for all V8 Ford's, 1 1/16' and 1 3/8'. But both input shafts have the same number of splines of 10.
1 1/16 ' input shaft | 1 3/8 ' input shaft |
10 spline |
Tailshaft
Also 2 popular OUTPUT shafts are available for the V8 toploader a 28 spline or a 31 spline shaft (sorry, no pictures)
4l60e Built Transmission
Tailshaft housing
Many different Tailshaft housings and shifter positions available with Toploaders.
Built Transmission For Brz
here are a few
Wide transmission insulator mount | |
C4DR-7A040-A | Narrow transmission insulator mount |
| Narrow transmission insulator mount | |
C6OR-7A040-C | Wide transmission insulator mount |
| Wide transmission insulator mount | |
C9OR-7A040-A | Wide transmission insulator mount |
| Wide transmission insulator mount |
Bolt patterns (bellhousing)
Built Transmission For 7.3 Powerstroke
2 different bolt patterns. Early Toploaders used a narrow bolt pattern type for attaching the transmission to the bellhousing and the later versions used a wider butterfly type bolt pattern.
Narrow bolt pattern | Butterfly bolt pattern |
Later type |
Toploader exploded view