Quote:
Originally Posted by 1970cstblazer
SOME 1970 K10'S/K/5'S with F76 had the red knobs. ALL 1970 K20 with F76 had the red knobs.
The October, 1968 parts book which also covers 1969 models shows 3937068 red plastic knob, which was changed to 3979551 blue plastic knob in 1/1971 per the 1/73 parts history book. That's why you will see the later parts books specify 1968-72 using the 3979551 blue knob.
I have shown MANY examples of 1969 Blazers, which used the open knuckle drum brake Dana 44, with red knobs.
I have shown MANY 1968 AND 1969 K10'S with closed knuckle drum brake Dana 44's, also with the same red plastic knobs as the 1969 Blazers.
Many GM parts books show 1968 as the transition year to the K/10 Dana/Spicer locking hubs that utilize the plastic hub knobs. Many of the internal hub parts interchange from 1968-1972 and even later than that!
As was shown, 1968 and 1969 also used the "Warn" semi lock hubs, so it appears either was used.
See older thread:
https://67-72chevytrucks.com/vboard/...d.php?t=251398
Also:
https://67-72chevytrucks.com/vboard/...d.php?t=809746 |
Where does the parts book say Red plastic hubs? Do we know that all these hubs don't interchange? Frankly, without intimate knowledge of these trucks you show the pictures mean nothing. If a vehicle needed the axle replaced due to accident or rough riding off road adventure GM would likely have supplied the open knuckle assembly.
I can buy that no Blazer ever had a closed axle, though I don't understand why. I do understand why only the K/5s had the NP205 available. That's only because in '69 only K/5s got the automatic transmission. I can accept that GM wanted to try the new design Dana 44 in the Blazers.
I still don't know about what you think about the original '68 K/10 I showed that has the old style Spicer lockouts. It either means that's what came on '68 K/10s or it means all these hubs interchange and all this talk is moot. From my experience, since 1973 with 4wds, has been the pte-70 trucks came with the all metal Spicers from factory. I have had K/5s, but only 70-72
Is there any way you could post your pictures so they fit the page? Like I said, I have not looked at your photos thoroughly and that's the reason, too big. Also, you do realize that white '68 K/10 is sitting on K/20 axles, right? Must be later small hubs