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69' Front Axle Change out Question.

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rencher2

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Sitka,Alaska
My 69' K20 has a Dana/Spicer closed knuckle front axle & I'm considering a Corporate 83' K20 front axle. Are the Differential Gears from the Original (dana/Spicer) interchangeable with the corporate ??? Also, leaf springs included will this match up with the 69' chassis???
 
yes it did. dana parts and corp parts wont swap. the axle it self will bolt up. but the internals wont swap over.
 
what sweetk30 is trying to say is that a corporate ring and pinion, and a dana ring and pinion are completely different and will not interchange (swap the dana R&P with the one from the corporate.
as for the leaf springs, your going to need to measure from spring center to spring center (on the axle) than if both the same, measure from spring eye to spring eye on one of the springs mainleaves.

LUKE
 
I have seen such a swap up close on bigyellowjimmy's 1970 . The axle will bolt right in , and the steering will work , and the driveshaft will attach .

None of the internals will be the same however , as mentioned previously . Two different axle designs , two different sizes of parts in the centersection .
 
Thanks that is a little clearer, I'll have to buy the gears for the corporate,to match My Eaton Rear axle, How can I find out which ratio without opening the rear end?
 
when was the last time you changed the axle oil? if you cant remember then time to drain and fill and look at code for ratio. most eatons were 4.10 or 4.56 some 3.73

if the front still has the little bolt tag on the cover it will say gear size.
 
rencher2 said:
Thanks that is a little clearer, I'll have to buy the gears for the corporate,to match My Eaton Rear axle, How can I find out which ratio without opening the rear end?
Click to expand...


jack up the rear of the truck. mark a spot on the pinion yoke... and mark a spot on one of the tires... Rotate the tire one full revolution, while counting how many times the yoke spins... multiply that number by 2...
 
Thanks Silver thats a good Idea, Im not real familliar with differential ratios , Does the front ratio have to be exactly the same as the rear? Forgive me I'm a Marine Deisel Mechanic.
 
If you have 4.09's in the front and say 4;11s or 4;10s in the rear.. you will be alright, but any thing much more then that and and youll be binding your tcase

by checking the rears with my method you sort of have to guesstimate how many times the yoke spun... so if it spins 4 times plus a little... then you have 4;10s, 4;09s, or 4;11s

if it spins 4 and a half times its 4;56s

so on and so on..
 
Cool thanks Silver your info is great , Any suggestions on where to get a good deal on Corporate gears if needed?
 
a lot of places.... you should pay around 150 for a set of them...

i dunno whats in alaska as far as gears go... Are you setting them up youself?

you might have to order them off the net...
 
Yeah its nothin but net on this Island , I was just curious if you had an specific sites in mind. Yeah all myself.
 
i dont know how much access you have to junkyards, or just parts in general. but it might be easier and more cost effective to just go out and find a newer open knuckle front end with the gear ratio you want, buy it for 100 bucks and be done with it....
 
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