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The axle that has been in the K5 up to now is 3/4 ton D44 with a Reid Racing knuckle for the crossover steering. A D60 seems like a better idea for a Cummins powered K5. I found one on CL a while back that had the right 3.73 gear ratio but was a DRW and a bit crusty. It sat for awhile in the garage and then I found some Dodge SRW external bolt hubs/rotors. They are supposed to be a straight bolt on. While that seems true enough, they were designed for the full time 4wd Dodge vehicles and finding locking hubs with the external bolt pattern is a challenge.
Usually when I come to a fork in the road of the decision making process and am not sure which way to go, I procrastinate in hopes of finding an ideal solution. That is what happened here. Until the other day, when I went ahead and put the D60 in just to free up some floor space in the garage. So, now it is in and everything came together nicely with an ORD cross over steering arm, some new ubolts, and some wire wheel clean-up duty.
The k5 ended up looking a little odd with the DRW wheels on there. That prompted a search for a solution to the external locking hubs issue. 30 and even 35 spline drive flanges are common enough for these. Superwinch used to make an external locking hub for these units. And a set of these in new old stock condition just surfaced for a solution. Here's a pic of the hubs.
On another note. I have been playing around with different suspension combinations to lower it a little. The rear just had way to much lift with a shackle flip and 4-6" springs. It has some stock 56" springs in there now and the axle is moved back 1.5" with the DIY4X spring perch and it is in an ideal location now. The Cummins xmember requires a 4" lift. And that is about all it should have.
With the Cummins, NV4500, 3.73s, and 35s it should be in an ideal all around rpm range for highways, cruising, and trail rides.