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Hello, new member here. We are looking for a part and it seems impossible to find. I have a 1978 Jeep CJ7 Golden Eagle Quadratrac with a 1339 full time w/low range transfer case and I need a part that broke. It is the Case Rear End Cap, it bolts up to the sprocket. I do not want to convert it to a part time with the kits available because I would like to keep it as original as possible. ANY help would be appreciated. Thanks
Jeep never sold that part by itself. It was always part of the differential assembly, which is the entire part you show in your photograph. Flint is the local authority on these units, and will weigh in presently. He has a lot of experience putting a working differential together from multiple donors.
The obvious response is to find a donor transfer case and use either the entire differential from the donor or parts from your unit and the donor to build a working differential. There is a WTB (want to buy) forum here and at IFSJA where you could advertise your need of these parts, or a donor unit. You could look on car-part.com for a wrecking yard near you that has one. The BW13xx was used in automatic CJ-7s 1976-1979 and in the automatic wagons and J-trucks 1973-1979, with full-time optional for some of that range and the Dana 20 standard.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.
Yeah, it's definitely broken. I'm afraid you are going to have damage on the shift collar and rear output shaft as well. The only way to inspect it is to remove rear output shaft and the Edrive shifter assembly.
Shift collar. The manual refers to it as Hub - Lockup Coupling. PN 18.550-3
It is also shown here next to Shaft - Rear Output. PN 18.550-1 (red asterisk)
Thanks for the great responses so far, the jeep is at a trans shop that has done a lot of these transfer cases but he cannot find the part needed and suggested I go to a part time kit. I told him I rather keep it as original as possible so I am looking for the parts. He checked everything else related and luckily there is no other damage to the shift collar or output shaft. The hunt for the parts continues...ANY help would be appreciated. That link with the Quadratrac breakdown is great, best one I have seen.
Glad to hear the other two parts I mentioned are OK. If all you need is the differential endcap, I have one.
Email me and we'll work it out. 401s <at> jubileejeeps.org
Thanks everyone for the advice, Fulsizjeep Flint was an amazing help, got me what I needed in quicker time than I could thank him. Flint I also ordered the American Made Chain from BJs but they are out of stock for a few weeks so I will let you know how it went when it is all back together..>Thanks again for keeping my Jeep original....G
PapaG wrote: ↑Tue May 18, 2021 11:32 am
Thanks everyone for the advice, Fulsizjeep Flint was an amazing help, got me what I needed in quicker time than I could thank him. Flint I also ordered the American Made Chain from BJs but they are out of stock for a few weeks so I will let you know how it went when it is all back together..>Thanks again for keeping my Jeep original....G
Glad you got it all figured out. The QT is one of the few CJ parts where the best info is here on FSJ forums.