4 Speed Overdrive Transmission - Ford SROD

Type 1 Ford Four Speed Overdrive Transmission Exploded View:

DISASSEMBLE
1. Remove transmission cover retaining screws, cover and gasket.

Removing Detent Plug, Spring & Screw:

2. Remove screw, detent spring and detent plug from case. A magnetic rod may have to used to remove spring and detent plug.

Removing Shifter Shaft Roll Pin:

3. Drive roll pin from shifter shaft, then remove back-up light switch, snap ring and dust cover from rear of extension housing.

Removing Shifter Shaft:

4. Remove shifter shaft from turret assembly, then the extension housing retail retaining screws, extension housing and gasket.
5. Remove speedometer gear retaining snap ring, then slide speedometer gear from shaft and remove drive ball.

Removing Output Shaft Bearing:

6. Remove output shaft bearing to shaft retaining snap ring, then using two screwdrivers, pry out bearing.
7. From front of case, push countershaft from rear of case with a dummy shaft. Lower countershaft to bottom of case.
8. Remove input shaft bearing retainer bolts, then slide retainer and gasket from input shaft.
9. Remove input shaft bearing to shaft retaining snap ring, then the input shaft bearing from input shaft and transmission case.
10. Remove input shaft, blocking ring and roller bearings from case.
11. Remove overdrive shift pawl, gear selector interlock plate and 1-2 gearshift selector arm plate.

Removing 3rd-overdrive Shift Fork Roll Pin:

Removing 3rd-overdrive Shift Rail:

12. Remove roll pin from 3rd-overdrive shift fork, then the 3rd overdrive shift rail.
13. Remove first, second and third overdrive speed shift fork.
14. Lift countershaft gear and thrust washers from case. Use care to avoid dropping the bearings or dummy shaft from countershaft gear.
15. Remove snap ring from front of output shaft, then slide third and overdrive synchronizer blocking ring and gear from shaft.
16. Remove next snap ring and thrust washer, first speed gear and blocking ring from rear of shaft.
17. Lift countershaft gear thrust washers and roller bearings from case. Use care to avoid dropping the bearings or drive shaft from countershaft gear.
18. From front of case, drive reverse gear shaft out of case.
19. Remove reverse idler gear, thrust washers and roller bearings. Use care to avoid dropping bearing.
20. Remove retaining clip, reverse gear shift relay lever and reverse gear selector fork pivot pin.
21. Remove overdrive shift control link assembly, then the shift shaft seal from rear of case.
22. Remove expansion plug from front of case.

ASSEMBLE
1. Reverse disassembly procedure to assemble.
2. Transmission mainshaft bearing rollers, extension housing bushing, reverse idler bearing rollers and countershaft gear bearing rollers must be lubricated with ES-M10109-A or equivalent at each location. The low gear and 2nd and overdrive gear journals are to be lubricated with ESP-M2083-G transmission oil or equivalent. All other internal components of the transmission are to be lubricated with ESP-M2083-C transmission oil or equivalent.
3. The intermediate and high rail welch plug must be seated firmly and must not protrude above front face of case, nor must it be recessed more than 0.06 inch below front face of case.
4. The endplay of the 1st, 2nd and overdrive gears after assembly on output shaft must be checked using a suitable gauge and must meet the following specifications:
a. With 1st gear thrust washer clamped against shoulder on output shaft, 1st gear end play should be 0.005-0.024 inch.
b. 2nd gear endplay should be 0.003-0.021 inch.
c. Overdrive gear endplay should be 0.009-0.023 inch.
d. Countershaft gear endplay after its assembly into case between thrust washers must 0.004-0.018 inch.

NOTE: If dimensions are not within specifications, replace components as necessary.

5. When gearshift selector arm plate is firmly seated in first-second shift fork plate slot, the transmission shifter shaft must pass freely through first-second shift fork shifter shaft bore without indication of binding.
6. Note the following torques:
a. Back-up lamp switch, 8-12 ft lbs (10-16 Nm).
b. Bearing retainer bolts, 11-25 ft lbs (14-33 Nm).
c. Case access cover bolts, 20-25 ft lbs (27-33 Nm).
d. Detent bolt, 10-15 ft lbs (13-20 Nm).
e. Extension housing bolts, 45-50 ft lbs (60-67 Nm).
f. Filler plug, 10-20 ft lbs (13-27 Nm).
g. Reverse gear fork pivot pin, 15-25 ft lbs (20-33 Nm).
h. Turret assembly bolts, 8-12 ft lbs (10-16 Nm).