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Old 03-01-2009, 01:38 PM   #1
71HUGGER396
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Rear Axle Question

I'm getting ready to start working on my 1970 2wd Blazer. It has 6 Lugs, I was going to keep it that way, but I got a really good deal on everything I needed for the disc swap up front, the new stuff has 5 lug. What's the differance on some of the rear axles? I have a 1972 rear axle, don't won't to use it, it;'s very rusty. The axle housing under the Blazer is very nice. Can I just change axles shafts.
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Old 03-01-2009, 01:44 PM   #2
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Re: Rear Axle Question

no 71 and 72 axleshafts are longer
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Old 03-01-2009, 01:50 PM   #3
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Re: Rear Axle Question

I was thinking that the axles were longer in 1970.
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Old 03-01-2009, 01:53 PM   #4
71HUGGER396
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Re: Rear Axle Question

According to Early Classics catalog, the 1970 is the same as 1972. That is why I'm asking all the experts on the board.
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1968 50th STEP SIDE SHORTY, 350/350, a/c, ps, p,b
Daily Driver, 1970 Cst short fleet, all black, 350/350,
1970 2wd Blazer, 2wd, 6 cyl. 3 spd, original, now a 454, 350turbo, 3.73 posi, on the road
1971 2wd fleet shorty, 454, 700r4, 3.73 posi, SOLD to 67OLDSTYLE72
"My rig's a little old but that don't mean she's slow" - SAWYER BROWN's Six Days On The Road

SEMPER FI "I use to be a lean mean fighting machine, but now I'm a huffin, puffin, over stuffin love muffin"
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Old 03-01-2009, 03:43 PM   #5
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Re: Rear Axle Question

1970 was a crossover year, some had the narrower rear and some had the wider rear, our 70 has the wider version.
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Old 03-01-2009, 03:42 PM   #6
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Re: Rear Axle Question

there is a good chance that the 70 is as long as the 71/72. There was a chainge mid year, it seems to be more of a chainge 1/4 the way through the year since more were wider than narrow.
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Old 03-01-2009, 05:01 PM   #7
71HUGGER396
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Re: Rear Axle Question

Can I just measure the housing or do I have to measure the axle shaft? What is the differance between the years?
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1968 50th STEP SIDE SHORTY, 350/350, a/c, ps, p,b
Daily Driver, 1970 Cst short fleet, all black, 350/350,
1970 2wd Blazer, 2wd, 6 cyl. 3 spd, original, now a 454, 350turbo, 3.73 posi, on the road
1971 2wd fleet shorty, 454, 700r4, 3.73 posi, SOLD to 67OLDSTYLE72
"My rig's a little old but that don't mean she's slow" - SAWYER BROWN's Six Days On The Road

SEMPER FI "I use to be a lean mean fighting machine, but now I'm a huffin, puffin, over stuffin love muffin"
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Old 03-01-2009, 05:57 PM   #8
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Re: Rear Axle Question

Just measure it from plate to and if it is the same as your '72 rearend, you're good. I know some 70's had the narrow rearend, but of the 6 or so 70's I've owned, all of them had the wide one.
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Old 03-01-2009, 10:36 PM   #9
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If you have the “wide” rear end your axle will be 58.5" back-plate to back-plate, if you have the shorter rear-end it will be 57”. If you have the axles out the "wide" rear end axle shafts are 31.5" long, the "narrow" rear end axle shafts are 30.75" long.
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Old 03-02-2009, 09:35 AM   #10
71HUGGER396
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Re: Rear Axle Question

Thanks for all you replies.
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1968 50th STEP SIDE SHORTY, 350/350, a/c, ps, p,b
Daily Driver, 1970 Cst short fleet, all black, 350/350,
1970 2wd Blazer, 2wd, 6 cyl. 3 spd, original, now a 454, 350turbo, 3.73 posi, on the road
1971 2wd fleet shorty, 454, 700r4, 3.73 posi, SOLD to 67OLDSTYLE72
"My rig's a little old but that don't mean she's slow" - SAWYER BROWN's Six Days On The Road

SEMPER FI "I use to be a lean mean fighting machine, but now I'm a huffin, puffin, over stuffin love muffin"
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