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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)
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. 2 different INPUT shaft are commonly available for all V8 Ford's, 1 1/16' and 1 3/8'.
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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.
Ford Transit 250
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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 Msa practice documentsmr. slacks 3rd grade language arts. 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)
Tailshaft housing
Ford Transit 250
Many different Tailshaft housings and shifter positions available with Toploaders.
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 |
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Bolt patterns (bellhousing)
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
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