Moto7man Posted March 14, 2021 Share Posted March 14, 2021 (edited) Just started to pull the 3AT out to repair the front differential which is hammered. The transmission is fine just the differential is the problem. I already have a 5 speed manual FWD transmission with clutch, flywheel ready to go in if the 3 AT is unrepairable.Photos and updates to follow. Edited March 14, 2021 by Moto7man Grammer Quote Link to comment Share on other sites More sharing options...
Loyale 2.7 Turbo Posted March 14, 2021 Share Posted March 14, 2021 I've swapped Differentials on Automatics, it is somehow, Easy. The hardest part was to remove the Transmission from the car, open it to reach the diff, then reseal it and reinstall it. Kind Regards. (as usual on my posts, underlined words are web links to further information and photos about the underlined subject) Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 27, 2021 Author Share Posted March 27, 2021 (edited) 3AT transmission is out of car. Edited March 27, 2021 by Moto7man Grammer Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 27, 2021 Author Share Posted March 27, 2021 Removed torque converter, I had already drained ATF from transmission, the front differential was dry. Looks like the pinion bearing disintegrated, then the pinion disintegrated and took a chip out of the ring gear. I marked the component positions with a marker. Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 27, 2021 Author Share Posted March 27, 2021 Here is a shot of the bell housing after disassembly. Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 27, 2021 Author Share Posted March 27, 2021 Collapsed pinion and bearing. Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 27, 2021 Author Share Posted March 27, 2021 Another shot of the pinion etc. Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 27, 2021 Author Share Posted March 27, 2021 The differential was leaking, I suppose from the bottom of the case. Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 27, 2021 Author Share Posted March 27, 2021 Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 27, 2021 Author Share Posted March 27, 2021 Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 27, 2021 Author Share Posted March 27, 2021 I know I have to remove the next section to get access to the pinion nut. I have already removed the external case bolts with the double washers.Do I move the governor, the speedo gear and the oil pump drive shaft,the turbine output shaft by removing the oil pump shaft bushing,the spring pin,the snap ring,the speedometer drive gear,the other snap ring? Then will the 2nd section of the case split away? Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 27, 2021 Author Share Posted March 27, 2021 Components just described above. Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 27, 2021 Author Share Posted March 27, 2021 The transmission was working well before differential failure.This is a shot of the torque converter. Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 27, 2021 Author Share Posted March 27, 2021 Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 27, 2021 Author Share Posted March 27, 2021 Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 27, 2021 Author Share Posted March 27, 2021 (edited) Edited March 27, 2021 by Moto7man Wrong file Quote Link to comment Share on other sites More sharing options...
DaveT Posted March 27, 2021 Share Posted March 27, 2021 I had one front diff run dry, leaked out the axle stub seals. The dead bearings wrecked the inside of the front case section. The oil pump shaft just slides out. The dissasembly starts at the rear end. The transmission parts are likely still as good as they were when it was running. The diff is seperate, uses gear lube. The seals between the diff and the transmission sections are probablyruined also. Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 27, 2021 Author Share Posted March 27, 2021 Thanks! I think the axle stub seals were leaking on mine as well. I will pull out the oil pump shaft and the governor and the speedo gear and go from there. Quote Link to comment Share on other sites More sharing options...
el_freddo Posted March 28, 2021 Share Posted March 28, 2021 Everything you described is standard mode of operation for the 3AT! We had one in the family lock up when the pinion shaft tried to insert itself into the diff centre when the pinion bearing imploded/exploded itself - due to a lack of oil! All the best with the rebuild... Cheers Bennie Quote Link to comment Share on other sites More sharing options...
Moto7man Posted March 28, 2021 Author Share Posted March 28, 2021 I pulled the differential off yesterday. It was fairly straight forward. I removed the governor assembly, the sun disks,the bearings,drive gears, everything pulled out of the case without a problem, then I split the differential case from the rear of the transmission. Now for the bad news, the reverse side of the differential case wasn’t in bad shape, but some bearings from the destroyed pinion bearing had damaged the upper shaft gear and housing. Also, the the entire back side of the differential housing was full of fine metal debris. Also, due to lack of lubrication, the governor was begging to apple core a little bit The transmission section was like new and damage and debris free. The transmission has always run perfect and it is looks new inside. I bought a 5MT five years ago with a flywheel and clutch kit and shifter, so I am going to install go the mt route. I need a mt manual transmission crossmember with the longer bolts if anyone has one. If anyone needs this 3AT,just pm me, it works fine, it just needs a differential. Quote Link to comment Share on other sites More sharing options...
Moto7man Posted April 2, 2021 Author Share Posted April 2, 2021 I need a transmission crossmember to mount up my FWD 5MT, does anybody have one? Quote Link to comment Share on other sites More sharing options...
Moto7man Posted May 2, 2021 Author Share Posted May 2, 2021 I have my 5MT about ready to go in fwd Loyale. But I need a transmission cross member.Anybody got one? Quote Link to comment Share on other sites More sharing options...
Moto7man Posted May 2, 2021 Author Share Posted May 2, 2021 (edited) Is the rear electrical connector for the reverse light?Is the other connector for the dash or clutch interrupter? The oring and seal behind the bearing retainer looks good, no leaks anywhere,would it be a good idea to replace the oring and seal anyway? Edited May 2, 2021 by Moto7man Specify question in greater detail. Quote Link to comment Share on other sites More sharing options...
DaveT Posted May 2, 2021 Share Posted May 2, 2021 On your last picture- If you remove the bearing holder, you will have to re set the bearing pre load / pinion & ring gear alignment. Maybe if you carefully, mark the position, and count turns while removing you could get it back where it was. I have not tried this. I have read the FSM directions for assembly, it doesn't seem trivial / fun to do right. Quote Link to comment Share on other sites More sharing options...
idosubaru Posted May 3, 2021 Share Posted May 3, 2021 (edited) Those are almost never preventatively replaced. They’re relatively easy to do in the car. Pull axle and replace. I wouldn’t do it unless the history and/or condition of the trans and seals wowed me. I might make the decision based on condition history storage. But they do leak occasionally, that’s a very old trans, and are very simple to do right now Mark exact location and count turns if you do. It needs installed the exact same location and depth to orient the front diff guts. Edited May 3, 2021 by idosubaru 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.