Installing a TREMEC T-5 in place of an automatic, behind a small block Ford is relatively straight forward. Using many of the same components and concepts as used in Fox body Mustangs in the ’80s and ’90s simplifies the process.
Start by using a TREMEC T-5 bell housing assembly from a 1984-93 mustang 5.0L and a Modern DriveLine clutch cable kit or the new Hydraulic Master/Slave kits. This is the easiest way to solve many swap issues. The T-5 bell housing fits both the Windsor blocks (289/302/351) and the T-5 without the use of an adapter plate. A Modern Driveline clutch cable conversion kit or Hydraulic kit removes the need to use the 3 or 4-speed clutch linkage and provides smoother operation. Both the cable kit and hydraulic kit bolts to the stock clutch pedal in just minutes.
T-5’s have a ¾” longer input shaft which sets the transmission back. Since it is set back ¾” and has a lower transmission mount, a replacement T-5 transmission cross member is needed. Not all cross members are built the same. Most cross members on the market don’t provide enough exhaust clearance or proper mounting of the e-brake lever.
The driveshaft will have to be shortened about ¾” to make up for the ¾” backset. (Caution: Measure the length required first. We have seen too often, driveshafts which were wrong, to begin with.) This can be done at any driveline service shop or purchase a custom made one from us in steel or aluminum (We will ask for measurements and build to fit).
The shifter on a T-5 line up with the shifter hole in the floor. Just a little of the floor has to be removed on the front and right side of the opening. The T-5 shifter has two threaded holes to mount almost any kind of shift lever desired. We offer both stock-like appearance shift lever, ball and boot, and the Hurst classic style. For those who like the Hurst look of the ’60s, there are several chrome levers to choose from. Hurst also offers five-speed pattern shift balls in white and black or T-handles found in 69-73 Mustangs.
Be sure to save the automatic transmission speedometer cable, as it will be reused. You will, however, need to install a T-5 speedometer driven gear, which is available in a variety of tooth counts to match your differential gear and tire combinations. Installing the new speedometer driven gear is simple, it requires removing the c-clip and pulling the old gear off and sliding the new one on.
Neutral Safety Switch
Automatics have a neutral safety switch so that the car can only be started in park or neutral.
The starters from early 289-302 Fords with automatic transmissions work just fine.