Duplex top case covers

[SuperB]

Hello everyone. I'm trying to figure if there was more than one style top cover used on the duplex 10-speed transmissions, and I was hoping someone could help. I just removed the older model duplex from my truck. I think it's a late 50's and it's a TRD-72. I have the correct year and type transmission for my truck all ready to be put in, and ran into a problem. This transmission is a 1965 TRDL-722 aluminum 10-speed. The issue is that the hand brake mounting is different between the two. In trying to figure it out, it looks like my 1965 transmission actually has the triplex style top cover even though the transmission's part number is right for my '65 B61. Its has the provisions for attaching the small triplex shifter box/housing on the driver's side. I guess that doesn't necessarily mean this cover is wrong for my truck, but it would require a different hand brake mounting bracket than what the TRD hand brake has.  

Any help in figuring this out would be really appreciated, I don't have any info on this in any of my books or manuals, and I can't find any pics online either. Thanks in advance 

[Geoff Weeks]

I would think anything by 1965 would have spring brakes? The requirement came in in the very late 50's IIRC

Edit: I am having trouble finding a statute that spells out exactly when "self applied" e brakes were required, so I may be wrong. I have always seen auto applied spring brakes on stuff newer than the 50's.

Edited 5 hours ago by Geoff Weeks

[SuperB]

According to the build sheet for my '65 truck, it came with a handbrake arrangement. Also, the transmission I'm putting in had the brake drum assembly on it when I bought it. That's all I have to go on though, unfortunately. I don't have any parts diagrams for my particular truck/transmission.

[Geoff Weeks]

I stand corrected.

It is like the "no recaps on steer" on trucks, everybody says it, but that isn't what the law says. I thought spring brakes were a requirement on stuff newer than early 60's late 50's.

Tru-Stop disk driveshaft brakes would meet the stopping requirements (I was told) but lacked the self-applied function, so they faded away from use.

[h67st]

I have TRD-67 and TRD-720 transmissions in mine, I may have a spare brake mount if you can post a photo of what your transmission looks like (where the brake mounts).