M923 13 Speed Swap

[simp5782]

Its the same companion flange in the transfer case that the front axle output uses

It's hard to make a shaft under 18 inches.

From the center or the 1710 joint to the end of the companion flange is 3in on the shaft side

 

[74M35A2]

They sell longer spline yokes.

Here are pics of the air lines I did on mine, sorry they are late. Let me know if you need more info on which goes where. Air fitting at the rear is truck air in. Goes directly to filter/regulator, then the push-to-connect fittings are for the shifter lines (range and splitter).

 

[74M35A2]

 

[74M35A2]

My fly housing is driver side starter. May be OK.

 

[Crf450x]

You need meritor A-3280-U-7535 companion yoke for the input shaft on the transfer case.

You need companion flange for the driveshaft part #7348215. Its the same flange as the transfer to front tandem uses. 1710. Every other flange on the truck shafts are 1610. I probably have one laying around.

You would be better to ditch that morph joint and make it a full 1710 joint and shaft

Awesome thanks. I will keep that as a back up plan. I’m trying to do this on a budget and that’s getting harder every day.

 

[Crf450x]

They sell longer spline yokes.

Here are pics of the air lines I did on mine, sorry they are late. Let me know if you need more info on which goes where. Air fitting at the rear is truck air in. Goes directly to filter/regulator, then the push-to-connect fittings are for the shifter lines (range and splitter).

Any idea where to find a longer yoke?

Thank you! So is there only 3 lines going to the shifter?

My fly housing is driver side starter. May be OK.

Sweet. I bet you’ll have plenty room then.

 

[SCM35A2]

Subscribed!

 

[74M35A2]

Yes, I believe so. I’ll confirm on mine tomorrow. , but that is what this diagram shows, and it covers both the range selector and gear splitter.

 

[74M35A2]

On the spline slip yoke, check this catalog just as an example under HD dept:

https://www.macpek.com/wp-content/uploads/2014/06/Spicer-slip-yokes.pdf

They offer them in different lengths, which I think is the easy way to do this. I think about $100 new?

 

[Crf450x]

Yes, I believe so. I’ll confirm on mine tomorrow. , but that is what this diagram shows, and it covers both the range selector and gear splitter.

View attachment 802926

Sweet. Thank you. Based on my research I need 5/32” air lines to the shifter. Gonna try to get everything plumbed up tomorrow. Bout time to put the cab back on and start the hard part.

 

[Crf450x]

I went against advice and modified the factory trans mount. I did get a new rubber mount to hopefully avoid any issues for a while. I won’t be driving the truck much and to be honest I’ll probably be tired of it after a year or two anyway.


Also pulled the shaft (more like 2 yokes) apart and cleaned it. It was very close to being seized, hasn’t seen grease in a long time. Just throwing it in for the pictures. Splines are 3”-16.

 

[74M35A2]

Good progress, thanks for the pics. Wow, that jack shaft is way shorter on a 250 setup vs the 8.3. Mine is way longer and an actual shaft with yoke end, will post a pic later.

On your morph-joint, I wonder if that could simply be made by buying a joint of each type and then just swapping out 2 of the wing ends. Should work if the journal shaft pieces are the same diameter and length.

 

[simp5782]

There is a 1710 joint yoke for the input transmission shaft. I would have to dig thru old threads for number

 

[74M35A2]

Some shift knob info for what I went with.

 

[74M35A2]

 

[Crf450x]

Awesome. I have the old style knob right now but I think I want one like that.

I decided to use all new air lines. Found that new transmissions come with normal dot tubing so that’s what I’m going to use. Just waiting on all that to come in.

 

[Crf450x]

Not much progress lately. Put my air lines on. Can’t do anything else until the cab is on. I’m hoping to do that Saturday.

 

[Crf450x]

Cab is back on. I’m hoping to have it on the road by the end of the month. We’ll see.

 

[Crf450x]

A little off topic but I mounted my coolant filter today. The bracket that came with it fit perfectly on the side of the block. Going to bypass the heater core for a while until I get some of this rust cleaned out.

Anybody know which heater core line is in and which is out?


This is the filter base I bought if anyone is interested. Made in the USA. https://www.amazon.com/dp/B0049LRCHK/ref=cm_sw_r_cp_api_i_SO8.EbEEDMM6R

 

[Crf450x]

I have the cab sitting on 4x4s right now and so far everything is hooking up just fine. I’m most likely going to make spacers (hood also) and leave it lifted up permanently. That will allow me to bend the shifter under the cab and come through the floor wherever I want. Also will help with jakes if I pursue that.