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Discussion in 'The Garage' started by 1979Jimmy, Jul 6, 2002.
... THAT DETERMINED WHETHER THE FRONT AXLE WAS A 10 BOLT OR A DANA 44?
most likely whatever the factory had lying around/available.
actually most 78's came with 10bolts /forums/images/icons/shocked.gif
Check out the specifications at the top of the page.Tells you everything you needs to know about a stock blazer.
Bill C /forums/images/icons/cool.gif
I don't think there was a set reason or package to get the D44 or 10 bolt. The late 70's was when they started to weed out the D44 and started using 10's, so some 77's have 10 bolts and some 79 and 80's have D44's. It's a toss-up! /forums/images/icons/frown.gif
I think i have a d44 but on the specifications page it said that it was either a d44 or a 10 bolt.
This is what a D44 looks like.
from everything i have been told and seen, in 77 they started using the 10 bolt. but used up the d 44's during production. if there were no d44's of whatever gear ratio needed, then the 10 bolt went in. by 1980 the d44's were gone.
Click here to ID your axle - Good pics
Somewhere I have heard or read that GMC equipped their line of trucks with the D44 up to '82.
The Chevy line was equipped with the 10 bolts from '77 all the way up to '91.
I'm not 100% sure about this though as I have seen a mix of both under each brand truck.
yup thats what i got.
I'd be very surprised if that were true, since both trucks were built at the same places. 1 character in the VIN determined if it was a Chevrolet or a GMC. The rig got trimmed out accordingly. /forums/images/icons/cool.gif
Looking from the front at the diff cover and to the lower right corner if it is a D44 it will say D44 on that ear.
I have never seen a 77-78 with a 10 bolt. As far as I was concearned, 78 was a test year for the 10 bolt and most came with 44's.
My 78 3/4 ton parts suburban had a 10 bolt 8 lug.
my 79 Jimmy had a 10 bolt
the parts blazer, which was a 77 had a 44.
My '80 Jimmy had a 10B, so I wouldn't put money on that. I had two '78 Chevys, one Blazer & one 3/4 ton P/U. The Blazer had a D44 & the 3/4 ton had a 10B.
Of course you can't discount what a previous (or even the current) owner might have done. I put the 10B my '73 and Grim has one in Dollar. Both those trucks started w/ D44s.
Not sure why they did it. My brother has a 79 3/4 ton with 4.11 10 bolt, and a 80 3/4 ton with 4.11 dana 44. Both had stock drivelines when he got them. /forums/images/icons/confused.gif
I have a 77 with a 10 bolt from the factory. It also has a column shift three speed manual too /forums/images/icons/grin.gif.
One other thing to think about between the D44 and 10 bolts: GM started the "first design" stuff in '77, so the 10 bolt was started into production then.
GM probably still had a lot of "leftover" D44's, meaning they were still under contract with Dana/Spicer, by the time they started the "first design" and wanted to use up the excess parts/orders. This method is why they probably dragged clear up to '82, which I definitely KNOW that many GMC's had the D44's in. I would bet the Chevy line of trucks discontinued the D44 in '80 as 99% of the '80 models I have ever seen or dealt with had the 10 bolts.
Man, GM sure did some weird and stupid sh!t if you ask me! /forums/images/icons/tongue.gif
GMC RULES! Profeesional Grade for reals back in the 70's not now though! LOL!
Bill C /forums/images/icons/grin.gif
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