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I have to return this fold out schematic of the 1545. I have it in PDF emailed to me but don't know how attach it with my I pad. Here is an overall shot and one of each end of the schematic.

It would be nice to have the details of the 1545 lock up torque converter control. Does anyone know how the hydraulic pressure is controlled inside of the valve body? I think most Allisons now use electronics, but the 1545 is hydraulic..... Hey Rusty???

No, go back in this thread and it gives the shift sequence. Going from 2 to 3 the converter is unlocked. Then the converter locks while in 3 and is locked when going from 3 to 4. That puts a lot of strain on the 4th clutch pack that could be avoided. The parts I reference are high...

The A3 is a redesign of the A2 and A1, but eliminate shifting. By the wisdom of the day, they took a good performing commercial Allison 545 and added the feature of the locking TC, calling it the 1545. Probably the reason there is a different thunk between 3rd and 3-4, is that the 2-3 shift...

The fourth/reverse piston is Allison 29505882 and they have an E on them across from the part number. Here is what I posted on another thread also. I'm going to post this on a couple of old threads that are likely to get hits when researching the Allison 1545 that is in our M35A3's. They are...

I'm bringing this thread back to add the part number for the fourth and reverse aluminum piston, when I get it located. If anyone has that part number, when I went through the rebuilding process, I didn't record it. It's an important part since the OEM piston seals were inferior and result in...

Glad it worked out. As far as I know, they are the only ones that can do it. And after having the tranny rebuilt, it makes no sense not to have it done, just to know there are no clutch particles inside. Best of luck.

Dacco in Tennessee did the TC. Had shipping 2 ways but they only charged me $150. http://www.daccoinc.com/products/torque-converters Yea, Allison will know what to do. the Torque converter issue may throw them a curve ball, as their books say TC components are not available. The tranny...

bj1104, If you have not ran it too long with this condition, you may not have destroyed the aluminum piston in that clutch pack (it's not the end if you have). In that case, seals, new friction plates and steel plates will be required but not necessarily the piston replaced. The cause is...

Don't keep going. The more you use it the worse off the piston in the 4th and rev. clutch pack will get. Mine had gotten so hot, the aluminum piston melted, sending aluminum debris, mixed with clutch fiction materials into the pan. Note that the filter (pan) has probably kept it from going...

I bought two A3's, one to hold and one to sell, and want to follow up on this (Allison 1545) subject. One of the A3's was purchased with a known tranny problem and I'll share what I have learned. The truck that I purchased had a used tranny put into it and it does the same thing, fourth and...