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Ford Bronco Parts - Classic Vintage Early Bronco Parts

T18 (Borg Warner) 4 speed manual – Transmission Guide

Tech article by admin and filed under - Manual, Transmission

Tech article by Jon Hanna (Admin)

Manual Trans Intro
Gear Ratio Chart

See also: Automatics

T-18 (Borg Warner) 4 speed manual
1965-1985 Ford pick ups with a 28 spline output shaft. Jeep and Scouts also came with T-18’s but the Ford version is more typical for the Bronco swap.
The T-18 has a one piece removable cover with a top shifter and looks very similar to the NP-435, however the cover is cast iron, not aluminum. Look for the bottom of the transmission case to taper up toward the rear. On the Ford T-18 the PTO cover plate will be on the passenger’s side. On Jeep and IH it’s on the driver’s side.
Adapter required?
The T-18 requires an adapter between the transmission and transfer case, replacing your 8 cylinder intermediate housing.
Similar advantages to the NP-435 swap, although first gear isn’t quite as low.
Similar disadvantages to the NP-435. In addition the T-18 may also require a new drive shaft.
Cost: (Approximate)
Transmission: $400 used and $800 rebuilt
Adapter: $350-500
Bell housing:
Standard Ford. The T18 will bolt up to your existing bell housing on small block (289-302-351) engines. The existing Bronco clutch is also used.
Modifications needed:
The entire assembly is 1″ longer than stock, which may require a new drive shaft depending on the amount of lift. Other modifications are similar to the NP435.

Manual Transmissions 1st 2nd 3rd 4th 5th
Bronco 3 spd (6 cyl) 3.41 1.86 1.00
Bronco 3 spd (8 cyl) 2.99 1.75 1.00
NP 435 6.69 3.34 1.79 1.00
T-18 6.32 3.09 1.69 1.00
Toploader (Close ratio) 2.32 1.69 1.29 1.00
Toploader (Wide ratio) 2.78 1.93 1.35 1.00
Toploader (Overdrive) 3.29 1.84 1.00 0.81
ZF 5.72 2.94 1.61 1.00 0.76
NV4500 (Dodge) 5.61 3.04 1.67 1.00 0.73
Automatic Transmissions 1st 2nd 3rd 4th 5th
Bronco C4 2.46 1.46 1.00
C6 2.46 1.46 1.00
AOD 2.40 1.47 1.00 .67
AOD w/ low gear set 2.84 1.55 1.00 .67
AODE/4R70W* 2.84 1.55 1.00 .67
700R4 3.06 1.62 1.00 .70

One Response to “T18 (Borg Warner) 4 speed manual – Transmission Guide”

  1. 83 Ford Bronco clutch replacement - Ford Truck Enthusiasts Forums Says:

    […] Another article, this one has all the transmission ratios: T18 (Borg Warner) 4 speed manual – Transmission Guide | Tech Articles The Mazda trans was the M5OD, right? 5-speed manual, where 5th gear was the overdrive. I think it […]

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