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It's a CV style joint like what is used on a boat. Unfortunately the allison twists even with a rear mount too much under heavy load and it snaps the 1810 joint off.

Yes. Some engineer thought this was a good idea. No wonder most of these trucks are rotting at RRAD

Another completed one. This one went with a 1810 short shaft from a Ford. 13.5in collapsed. 16.5in extended. I wanted to use the one bolt hole on each frame as a guide so i slotted the transfer case bracket to give me the extra inch to the rear I needed for the longer shaft. Spray wax makes...

More pics. Those bolt holes missing in the frame are left empty due to the mounting bracket braces for the transfer case being right behind them.

Adding another one I completed awhile back. I used the jackshaft from a 916 truck with a CAT. Jackshaft is 13in long from center to transfer case face. Moving the transfer case back 9 inches works. Sitting 4.5in below the frame top. Requires drilling 8 holes. 4 per side. Using 1 existing...

Finished the driveline modification in 2 out of 4 trucks so far. This isn't a hard modification just tedious work when I have time. When I do have time it is generally raining.

The spicer pro shift is in .70. But with a 920 you have enough room for an auxiliary transmission behind the transfer case. Some of those are in the .65 range .70 with 12R24.5s is 67mph at 2150. With 11R24s is 69. The 7 spd trucks are around 75 in 7th at 2150 on stock tires.

They put them in some 920s I have been looking at a triple overdrive 13 speed eaton for my 920. .84 .73 .60 ratios.

Yeah. I ended up buying the smaller 904 for little stuff. I ended up needing to punch 28 3/4" holes in the frame of the 920. Took under 90 minutes thru the double frame

Wtec5 truck transfer case relocation option. The short coupler unit does not have long term success for commercial use in my opinion. The transfer case yoke also uses bolts with springs to secure it which is different from a stock unit. Relocating the transfer case back 5 inches allows you to...

Pictures of a WTEC 3 truck with air ride

So this thread will be information, hints, tips, upgrades to the original M916, M917 and M920s that received the 7 speed upgrade. 2 types of the transmission were used a 4700SP WTEC 5 and a HD4560P WTEC 3. Both are double overdrive with .74 and .64 ratios. Both use a device similar to a cruise...