T 90 A1 question

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   working on a T 90 A-1 out of an M38. It’s a bit of a mystery basket case jeep and has me pulling out some more hair from my head. 
While out on my 4th test drive a bolt that had been left loose in the transmission jammed on a gear and broke the case. I pulled the transmission with plans of using a spare T 90 A-1 case but have found some unexpected differences. First is the broken case does not have any provisions for an oil slinger, no slinger installed and no mounting holes for it in the case. The 2 smaller thrust washers were missing and only 1 of the synchronizer springs were installed. I could see the spring being missed but with the case differences I thought I would pose the question about the thrust washers. 

Will the internal parts of all T 90 A-1 interchange? I talked with Novak when I ordered the parts I needed but they have not run across a case like the one I’m working with. 

Hoping someone here could shed some light on it for me. Case ID photo below. 

Mike

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RSR_MK Members Profile Send Private Message Find Members Posts Add to Buddy List Member Sponsor Member Joined: 22 May 2009 Location: Cabool Mo Status: Offline Points: 657	Post Options Post Reply Quote RSR_MK Report Post Thanks(0) Quote Reply Topic: T 90 A1 question Posted: 25 Apr. 2019 at 7:00pm
	working on a T 90 A-1 out of an M38. It’s a bit of a mystery basket case jeep and has me pulling out some more hair from my head. While out on my 4th test drive a bolt that had been left loose in the transmission jammed on a gear and broke the case. I pulled the transmission with plans of using a spare T 90 A-1 case but have found some unexpected differences. First is the broken case does not have any provisions for an oil slinger, no slinger installed and no mounting holes for it in the case. The 2 smaller thrust washers were missing and only 1 of the synchronizer springs were installed. I could see the spring being missed but with the case differences I thought I would pose the question about the thrust washers. Will the internal parts of all T 90 A-1 interchange? I talked with Novak when I ordered the parts I needed but they have not run across a case like the one I’m working with. Hoping someone here could shed some light on it for me. Case ID photo below. Mike

ndnchf Members Profile Send Private Message Find Members Posts Add to Buddy List Member Sponsor Member x 2 Joined: 22 Sep. 2017 Location: Virginia Status: Offline Points: 2177	Post Options Post Reply Quote ndnchf Report Post Thanks(0) Quote Reply Posted: 25 Apr. 2019 at 8:05pm
	I've read that they did away with the oil slinger on later T90s. I rebuilt a spare one last November and used a sealed front bearing. From what I read and watched on videos, I could have done away with the slinger or kept it. I decided to keep it.
	1948 CJ2A - It goes nowhere fast, but anywhere slow.

Stev Members Profile Send Private Message Find Members Posts Add to Buddy List Member Sponsor Member Joined: 27 July 2016 Location: Cincinnati Status: Offline Points: 2391	Post Options Post Reply Quote Stev Report Post Thanks(0) Quote Reply Posted: 25 Apr. 2019 at 8:56pm
	Fun Fact - T90c does not have an oil slinger. It uses the same case at the T90a, its cluster gear is larger and will not fit into the case if the oil slinger is installed.
	Stev 1946 CJ2A Trail Jeep (The Saint), 1948 CJ2A Lefty Restored

RSR_MK Members Profile Send Private Message Find Members Posts Add to Buddy List Member Sponsor Member Joined: 22 May 2009 Location: Cabool Mo Status: Offline Points: 657	Post Options Post Reply Quote RSR_MK Report Post Thanks(0) Quote Reply Posted: 25 Apr. 2019 at 11:16pm
	I’ll check the cluster gears in both cases. Any other way to tell if it was a T 90C ?

RSR_MK Members Profile Send Private Message Find Members Posts Add to Buddy List Member Sponsor Member Joined: 22 May 2009 Location: Cabool Mo Status: Offline Points: 657	Post Options Post Reply Quote RSR_MK Report Post Thanks(0) Quote Reply Posted: 25 Apr. 2019 at 11:33pm
	Input gears are 18 tooth and cluster gears are 33 tooth in each. It still could be a reworked T 90C case I assume. Mike

Bill2A Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 01 Mar. 2018 Location: Fort Worth, Tex Status: Offline Points: 517	Post Options Post Reply Quote Bill2A Report Post Thanks(0) Quote Reply Posted: 26 Apr. 2019 at 1:17am
	It does sound like someone has been in it for some reason. I bet between the two of them, you can come up with a good trans.
	1946 CJ2A 14098

RSR_MK Members Profile Send Private Message Find Members Posts Add to Buddy List Member Sponsor Member Joined: 22 May 2009 Location: Cabool Mo Status: Offline Points: 657	Post Options Post Reply Quote RSR_MK Report Post Thanks(0) Quote Reply Posted: 26 Apr. 2019 at 3:18am
	I agree, as long as the cases are interchangeable I’m good. It could have saved a more costly repair then a small parts kit and two oil slinger bolts. The bolt in the tranny was the same size as the six top cover bolts. Head did not match any of the other six but there were only three of those that matched, three others were all different. What was in the case was the one bolt and two matching lock washers. May have dropped two in and found one and forgot the other one. The case was mounted and closed up when I started this project. I pulled the shifter tower and the case was bone dry, looked like a fresh rebuild that had never had oil in it. The engine had some type of fluid in it but it was not oil. Smelled like old fuel oil. Who ever rebuilt the transmission left out the two small thrust washers on the countershaft and one of the springs for the synchronizer assembly. The front thrust washer showed some heavy wear. Anyway I have a few T 90 cases laying around but the internal parts are harder to come by in usable condition. Could have been worse. It’s been a fun project. Mike