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I had been operating with the idea of avoiding the newer electronic transmissions (well, anything electronic given that the rest of the truck is mech-only), but it sounds like that will be the way I go when the current one no longer serves. There's no need for anything other than the barebones...

Have you tried darpco in Charlotte? They're decent to work with. Other option might be a junkyard...

Sorry about the carnage, but I'm curious how this goes... definitely post pics as you go.

The 2 thing I can add to that line of discussion (because I otherwise agree) is that the MT643 includes the torque lockups in 3rd&4th that the 1545 did (and the 545 does not). That aids in braking. And the 545 is right at the very peak of it's curve in terms of torque/hp. The MT643 came out...

I'm "watching" this thread for sure. From what I've heard, you're going to have to trim down the ears on the housing on the MT643 a bit to clear the frame rails. But it should just bolt right up - it's the same 6 bolt pattern as the AT(1)545 from what Jason at Darpco in Charlotte told me...

@rustystud or @tobyS you have anything for this thread?

Which is exactly why I was looking at the MT643 as a possible replacement for the 1/545 - I don't want to go electric on a truck that is otherwise purely mechanical. But that's just my position. I know there are people out there who wouldn't have done other 'mods' to their trucks that I've...

lemme tell ya the T1138 is gonna be CHEAP compared to a 1545 - those damn things are made of unobtanium. I found ONE rebuilt one for sale. $7800. And a relative pile of unknown takeouts (2). If I need to replace my 1545, I'm going to take a look at what you guys wound up going with first...

Well it's gone full circle at this point. lol I'm just curious what comes of this because at some point I'm going to need a replacement for my (1)545. I was thinking a MT643, and may still, but man, overdrive would be awesome.

I don't know, maybe it won't work for you with the 6bt, but have you considered an Allison MT643?