Ford 4 speed Toploader

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

4 speed Toploader Identification page

Close and Wide Ratio

2 types of gear ratio are commonly associated with the 60's 70's toploader

	Ratio type	1 rst	2 nd	3 rd	4 th
	Close ratio	2.32	1.69	1.29	1.00
	Wide ratio	2.78	1.93	1.36	1.00

Ratio chart page 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
	023294	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
	010658	Transmission serial number

4 speed Toploader Identification page

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.

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

Many different Tailshaft housings and shifter positions available with Toploaders.

here are a few

	C4AR-7A040-A	Wide transmission insulator  mount
	C4ZR-7A040-A	Narrow transmission insulator mount
	C6OR-7A040-C	Wide transmission insulator  mount
	C7OR-7A040-A	Wide transmission insulator mount
	C9OR-7A040-A	Wide transmission insulator  mount

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
Early type	Later type

Toploader exploded view

C4 application chart

C4 transmission can easily be identified by the 11 bolt oil pan

C6 application chart

FMX FX MX application chart

3 speed application chart