Hi & an axle question :)
 

Hiya :) Just found these boards and hoping some of you might be able to help.
I need to know what axles came in Chevy trucksand what years and models they where in.
gearing doesn't matter, but I need to find out the bolt patterns.
But, I mostly need to know where I can find out what they use from the factory in front and rear and the years.
Hope that makes sense

Thanks

Kate

1/2 ton axles have 6 lugs. 1 ton axles have 8 lugs. not sure about 3/4 ton I think they are 8 also. If i'm not mistaken all chevys are that way.
1/2 tons usually have Dana 44 front and 10 or 12 bolt rears.
1 tons have dana 60 front and dana 60, 70 or 14 bolt rears.
I don't know anything about Eaton axles though. I hope this helps a little.
Can somone help me out here?

in 67-72 1/2s had dana 44 front, 12 bolt rear same but later on around 79 or 80 they went to 10 bolt front 10 bolt rear.....
3/4s are 8 lug and have dana 44 front and eaton rear i think SOME had rear dana 60s?
73+ they had dana 44 and 14 bolt FF rear......
1 tons had dana 60 front and 14 bolt FF rear

That probably is a bit confusing. A 10 bolt rear has 10 bolts holding the rear cover on the Differential, not 10 bolts hoding the wheels on.

Just checking

good point, i should have clarified that!

Some more usefully info:

Dana 44 8.5" ring gear front or rear, rear were mainly in leaf sprung GMCs(67-72) pre 72 in front had small 260X ujoint went to 297x ujoint in 1973. Dana44 last used in approx 1978. Semi-floating except front.

10 bolt(GM axle) 8.5" ring gear front or rear, this axle and a 44 in the front are relatively the same strength wise. And have some interchangeable parts. Came out in 1973. Semi-floating except front.

12 bolt(GM axle) I believe 8.75" ring gear. Used in the rear in 1/2 ton trucks 67-72. Not positive. Full floating

Dana 60 9.75" ring gear. Used in 3/4 tons out back from 67-72. In the front has 332x u joint. Was used it the front from 78-?.

Eaton rear ?-72 has a cover w/ 10 bolts and drop out center section. 3 different ratings with correspondingly larger ring gear. Not parts readily available. Highest gear is in the high 3s (like 3.90:1 maybe 3.73). Lots of low gears. Full floating.

14 bolt(GM axle) two versions full floating(FF) and semi floating(SF). FF has 10.5" ring gear came out in 73 in the rear of 1 ton trucks. SF had a 9.5" ring gear and was used in 3/4 ton and light 1 tons from I want to say some time in the late 70s early 80s.

Dana 70 also 10.5" ring gear as strong as a 14 bolt FF mainly in dually configuration not sure of the year.

FF- bearings carry load of vehicle(desireable) If axle breaks tire is still attached to vehicle.
SF-Axle shaft is intergal part of load carrying there for is subject to more stress. If the axle breaks there is a good chance the tire will leave the vehicle.

I'm going to double check this when I get home from work and correct as neccesary. Let us know what your looking at and we can go from there.

Welcome to the board! It's addictive!

I have 2 chevy 3/4 tons (69 & 70) with Dana 44 fronts and HO72 Eaton Rears. I also have a 71 GMC 3/4 ton Frame with a Dana 44 Front and Dana 60 Rear.

Were the 67 & 68 Closed Knuckle fronts Dana 44's?

Yes they were and apparentely some 69s also came with closed knuckle 44s.

It seems GMC came with Dana 60s more often in the rear.

67-69 trucks had closed knuckle front dana 44s, 69 blazers had open knuckle dana 44s