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You are here: Home Tech Articles & Tutorials Engine/Transmission Manual Transmission Identification Guide
Back to Technical Index

Manual Transmission Identification Guide

 

UNDER CONSTRUCTION

NP-435 4-speed (New Process)

VIN Data Plate Code: "A"
This is a 'Granny-Gear' transmission with an unsynchronized first gear. This strong and reliable transmission was installed on '69-'79 Ford pickups, as well as Jeeps and IH pickups and Scouts. The 2WD versions have a square tail-housing bolt pattern, while the 4WD NP-435's tail-housing pattern is more of a trapezoid, with the bottom bolt holes being farther apart than the top bolts. (4WD trucks with a divorced transfer case, however, also have the square tail-housing bolt pattern.) It can be identified by a bolt-on aluminum top cover (most stamped with 'NP' enclosed in a circle) secured with 8 bolts and with the gearshift coming directly out of the top and a fitting on the driver's side for the backup light switch. There is also a PTO port on the right side of the case.

The Ford NP435 has a 1-1/16" diameter, ten-spline input shaft that has a stickout of 6-1/2" from the front face of the transmission. The pilot tip of the transmission measures .668". The front bearing retainer flange measures 4.850" and the bearing retainer tube is 1.432" in diameter. The front bolt pattern is the symmetrical Ford "butterfly" pattern; 8-1/2" wide by 6-5/16" tall. The input shaft length is 6-1/2". It is equipped with a 28-spline output shaft. Case length is 10.875".

NP-435 gear ratios
1st - 6.69
2nd - 3.34
3rd - 1.79
4th - 1.00

Weight - app. 120-130 lbs.

Click here to download the NP435 rebuild guide. This is a GM publication, but the information contained within is applicable to the Ford transmission as well.

Borg-Warner T-18 4-speed


Borg Warner T18
(shown without extension housing)


Borg Warner T19
(shown without extension housing)

Another Granny-Gear transmission. These transmissions were installed in many 1965-1985 Ford pickups (as well as Jeeps and IH Scouts) as a successor to the T98. Ford used three different versions of this transmission, which is equipped with a 28-spline output shaft. Both the case and top cover are cast iron, with the top cover being secured with 6 bolts. First gear and reverse are not synchronized. It's replacement, the T-19, was used in '74-'88 Ford pickups and some IH trucks and is identical in appearance except has a 5.11:1 first gear ratio which is synchronized.

The T18 & T19 has a 1-1/16" diameter, ten-spline input shaft that has a stickout of 6-1/2" from the front face of the transmission. The pilot tip of the transmission measures .668". The front bearing retainer flange measures 4.850" and the bearing retainer tube is 1.432" in diameter. The front bolt pattern is the symmetrical Ford "butterfly" pattern; 8-1/2" wide by 6-5/16" tall. The input shaft length is 6-1/2". Checking these dimensions will verify that the transmission is a 1966 or newer model, precluding it from being the T98. The transmission can also be identified by its casting numbers cast into the driver's side of the case. T18s have casting number "13-01" and T19s have casting number "13-09". Case length is 11.875". Unlike the  NP435, the PTO port is on the driver's side.

From 1966 until 1978, many T18s used a T98 shifter assembly. 1979-newer T18s used a three-fork shift cover assembly that shifts reverse gear directly. Because of this, reverse location is on the opposite side of neutral than the earlier version (‘66 to ‘78). Earlier versions reverse gears shifts over and up - later versions shift over and down.

T-18 Gear Ratios
1st - 6.32
2nd - 3.09
3rd - 1.69
4th - 1.00
   R - 7.44
Click here for an exploded-view schematic of a T-18 (168K)

Click here for a larger version of the same image (338K)


(1966-1978 version)


CLICK TO ENLARGE

Ford 3-speed

VIN Data Plate Code: "C"
The Ford 3.03 3-speed (HFF model) was available on F-100 through F-250 trucks with a column-mounted shifter. It derived it's '3.03' name from the actual measurement in inches of the distance between the countershaft and input shaft centerlines.

MORE INFORMATION COMING SOON


 

Trans. Model

Engine Model First Second Third Reverse
RAN-E1 240-1V F100 114” WB (Slip Yoke) 2.99 1.75 1.00 3.17
RAN-G1 240-1V F100/250 131” WB (Fixed Yoke)
RAT-G 300-1V
360 2V
F100 114” WB (Slip Yoke)
RAT-H 300-1V
360-2V
F100/250 131” WB (Fixed Yoke)
RAT-V 390-2V F100 114” WB (Slip Yoke) 2.42 1.61 1.00 2.33
RAT-W 390-2V F100 131” WB (Fixed Yoke)
RAT-AF 390-2V F250 131” WB (Fixed Yoke)
SOURCE: 1968 Ford Shop Manual

The 3-speed was also available as the Borg Warner T-85 overdrive. Here are a couple scans from the '67 factory service manual which describes it's operation. (Click to enlarge.)

Sources:
 - Novak Conversions - transmission adaptors and related hardware
 - factory Ford Shop Manuals

Related Links:
 - Gear Vendors Overdrive Units for Ford transmissions
 - Ford inline-6 transmission history

4-spd Toploader Links:
 - GearZone

 

 
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