SR4 Manual 4-Speed Borg-Warner Transmission Parts Jeep CJ7
Gears, synchro components and gasket kits for your four-speed (1980-1983).
Why the SR4 has a reputation as the CJ7's weak point.
The SR4 arrived in the CJ7 in 1980 – a four-speed with an aluminium case, paired with the smaller engines as part of the drive toward better fuel economy. Lightly built and tightly dimensioned, it was never intended for the torque peaks an off-roader calls up when towing or working rough ground. It shows its wear accordingly: the blocking rings for first and second gear give way first, the shift forks wear at their guide faces, and the snap rings on the main shaft lose their grip once end play builds. Anyone who has driven for years with a slowly dropping oil level – caused by a tired output seal or a hardened cover gasket – usually finds scored bearing surfaces as well once the case is open. The good news: every wear item is available individually or as a kit, so an SR4 can be built back up rather than replaced with a used gearbox of unknown history.
What you will find in this category
- Gears and shafts: The first gear with 33 teeth and the complete cluster gear are available separately, as are second and third gear, the reverse idler and the input shaft.
- Synchronizers and shift forks: The blocking ring set for 1st and 2nd gear and the 1st/2nd gear shift fork cure the crunch when pulling away; synchronizer plates, springs and fork inserts complete the repair.
- Bearings, snap rings and thrust washers: The output shaft bearing and the second gear snap ring take out accumulated end play; roller bearings and thrust washers round out the set.
- Gaskets and oil seals: The gasket and seal kit covers reassembly in full, while the output shaft oil seal stops the oil loss toward the transfer case.
- Complete rebuild kits: The master overhaul kit bundles bearings, rings and gaskets; the small parts master kit restores springs, pins and washers in one step.
- Housing, shift linkage and electrics: The bell housing replaces a damaged interface to the engine, the shifter boot keeps the cabin sealed – plus shift rod bushing and back-up lamp switch.
Where the parts for your SR4 come from.
The backbone of this category is Crown Automotive – gears, shafts, synchro components, bearings and complete overhaul kits from one source, which keeps part numbers consistent through a full rebuild. The bell housing comes from Omix, the input bearing retainer gasket from Mopar, the manufacturer's own parts programme, and the back-up lamp switch from US specialist Standard Ignition.
Torque specs, installation sequence, shipping times.
The SR4 is easily confused with the T4 or T5 – many small parts carry over between them, but the gears do not. We help you identify the gearbox unambiguously from model year, engine and tooth count, and advise on installation sequence, cover bolt torques and what the overhaul kits actually contain. Just send us your VIN. Your order leaves the warehouse in Germany as quickly as possible.