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Old 11-18-2009, 07:46 PM
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69 chevy pickup rearend

ok i am stumped i am looking at putting a 3.73 gear in my 81 chey c10 i have a 69 chevy that i want to pull the rearend out of and put in my 81 but i cant figure out what rearend in the 69 i know that the 69 was a v8 truck with a 3 speed or 4 speed manual tranny someone wrote all over the id sticker in the glovebox i would just pop the gear cover but the way the the truck is sitting i cant get to it.

anyone know what was standard in a 69 chevy with a v8 and 3 speed or 4 speed manual

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Old 11-18-2009, 08:44 PM
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The gears will not directly swap from the 12-bolt housing under the 69 to the 10-bolt housing in the 81.

The axle will not swap if it is a coil spring axle, and a LOT of work would have to be done to it to mount it under the 81.

The axle may be a direct swap if it is a leaf spring axle, if not- it wouldn't be a difficult job to possibly weld on a pair of spring mounts and weld up a new pair of shock mounts to it, as those are in different locations from what I remember.
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Old 11-18-2009, 09:41 PM
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I was going to put a 14 bolt out of a 79 Chevy truck under my 72 K5 Blazer a few years back and one thing I remember is that the leaf spring perches on the Blazer are narrower than the newer trucks. I needed to relocate the perches to swap the axle. I ended up selling the Blazer before I ever went through with it.
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Old 11-19-2009, 06:59 PM
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yea the 69 has a coil spring setup and i have a race car shop near me so i can get spring perches pretty easy so that is not a problem. i just wanted to try and figure out what rearend was in the truck before i pulled mine out and got the 69 truck out of the woods.
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Old 11-19-2009, 08:19 PM
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Does the '81 have a 12 bolt or a 10 bolt? The 8.5 10 bolt was used from '82 and up, but your '81 might have the 12 bolt. If it does then the internal parts will interchange, except for the axles. The '69 should have the trailing arm suspension instead of leaf springs. Chevy didn't start using leaf springs until '71 if I remember right.
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Old 11-20-2009, 10:52 AM
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1980 was the swap year for the 12-bolt rear but the 12-bolt could be found in a few for a couple more years as the warehouses were finally emptied of old stock. I've seen them as late as 1984. The front axles on the 4X4's were supposed to be swapped from the Dana 44 to the Corporate 8.5 inch 10-bolt front axles in 1977 but those were also able to be found up until around 1980.

The 67-72 trucks had the coil spring rear in the 2WD 1/2-ton from what all I have seen, and the 4WD all had leaf spring rears.
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Old 11-20-2009, 11:00 PM
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77-82 was the years they used both and could have either axle.

vans same way

k-5 blazers all had 40" wide packs at least in 4x4 form

however in 69 all k5 were 4x4

then 70-72 there were 2wd available and they were most likely coil type but i am not positive on that because i have not seen any 2wd k5 except a 1980 one i had.

coil frame differ from leaf frames in that the coil frame bow out real wid over the axle wheras the leaf type frame stay straight and do not bow out, same as a 1 ton frame, but smaller channel size.

all 1 ton were leaf type, straight rail type.


everything else was 42.5" spring pack distance including possibly the 2wd blazers as well.

some chevies had leaf spring it was optional and also found under most gmc trucks,
it was RPO G70 leaf type rear

gmc was basically backwards from chevy with the rear susp types.

but std equipment under chevies was coil, yes

and 1972 was the llast year for coil rear and the 67-72 CST era body style

all 4x4 were leaf type yes

no 1 ton had coil rear, all were leaf type like 4x4 were

no 1 ton 4x4 existed until '77 except for some special built(not factory built) for forestry or fire or emergency use, etc.


1/2 and 3/4 ton interchange directly due to same pack distance(42.5")


70 and up the axle shafts interchange with no other parts swap(backing plates etc)

70 was the year the 12 bolt was widened 1.5"

but 70 was still 6 lug

so it was a one year deal but you can put any '70-up shafts in

'64-69 you can use '70-up shafts but you have to swap ('73-up) wider 2.75" wide brakes and plates on also. the 3/4" wider shoes difference both sides makes 1.5" total and works well to convert the 64-69 to 5 lug

the truck 12 bolt existed from '64 to '82
our 82 k10 has 12 bolt rear original untouched. 2.73

Last edited by fast68; 11-20-2009 at 11:13 PM.
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Old 11-21-2009, 05:01 PM
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alot of good info fast68 thanks

my 81 has a 10bolt with 3.07 gears i hope to have the 69 rearend pulled this weekend. i will let you all know what i find.

thanks again
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