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Couldn’t agree more. Admittedly I made it worse by adding taller tires to get better road speed. I’ve been doing the lo 2-5, hi 4-5 for a little while. Getting better at it but it’s never a guarantee I’ll hit the shift on the transfer!

Thanks! I’ll definitely be learning a lot with this set up. All I know so far is to avoid a low gear in the main while running high in the auxiliary. Better to multiply torque with the auxiliary.

I'm actually pretty happy with the final gearing. The 5 speed, being an overdrive, with the 395's I sit at around 60 mph at 2200. I mainly want the auxiliary box so I can have two more gears (3 over, 4 under) between 3rd and 4th. I also like shifting twin sticks. And I also like the double...

I’ll post everything as I do it. Maybe in lots of threads though, because it’s gonna drag out for a lot of years. I just finished building a 57 ft. trailer to pull behind the 30 ft. 5 ton, so I’ve been busy with that. It’s important to always be doing something stupid.

I finally pulled the trigger on a 7041. I might be misinformed, but the trans has to have an input torque rating of some kind. What I've found is that in the case of the Spicer auxiliaries, the first two numbers (x 100) is the rated input torque. So the 7041 would be rated for 7000 lb ft...

Just looking at pictures, it looks like the 8341 has yokes close in size (or the same as) what's on the truck now. It also looks like the 7041 has a different size yolk on the input vs the output. Smaller on the input I believe. I expect I'll have to do some machining to get things to match...

Thanks Topo! I appreciate you responding and I appreciate hearing from someone with experience with one. That was exactly what I was hoping to hear. I'm gonna pull the trigger on a 7041. They seem a little easier to find, a little cheaper and if it held up to what you used it for it'll be...

Thanks Topo! Did the Mack with the 290 also have a 7041? If so, I'd be curious what your GVWR or GCWR was. My Cummins will be tuned close to that and be running around 60k I'm expecting.

I don't know if it was pulling any real weight. It was an old video too, but it did get me looking around more and seeing that yeah, I usually see them in single axle trucks, sometimes gas or small diesel, but not a lot of the bigger class 8 trucks. hmmm. It's looks like I'm running across...

Thanks again for your input. I have zero experience with that box. I was mostly going off of a YouTube video I found with a Spicer 5 speed and 7041 behind a Nifty 250 on a cab over. I did read about the linkage interference when the joints get worn so I’ll try to design around that best I can...

Thanks! You're probably right about the 18 speed. I may end up wishing I went that route in the end. Thanks for the input on the 7041. I haven't found any torque/hp specs on them (probably because it's an auxiliary so who knows what gearing someone puts between it and the engine) I'm going...

I have an M820 chassis cab (so the extra long wheelbase) that I am modifying into a tractor using a '53 International Metro van body as the cab. I'm sliding the tandem all the way to the back of the rails, moving the Rockwell transfercase back and (I'm thinking atm) I'll add a Spicer 7041...