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Canadian Poncho Homepage -> Canadian Poncho -> Off Brand Cars/Parts Wanted -> wanted: 3:08 truck diff and or gear set for 67-72 truck
Post Info TOPIC: wanted: 3:08 truck diff and or gear set for 67-72 truck
beaumontguru


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wanted: 3:08 truck diff and or gear set for 67-72 truck
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Just in case anyone might have a gearset or compete diff for a 67-72 truck with factory 3:07 or 3:08 gears.  Looking to convert my 3:73 to a better hwy gear.  Not sure if the later 70's trucks are the same carrier or not,  also not sure if the carriers are the same from a 3:73 to a 3:08? Even the truck forums provide conflicting views.  1/2 ton stuff.  locally prefered.



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Beaumontguru

MY BEAUMONT HAS 4 STUDDED TIRES AND 2 BLOCKHEATERS......AND LOTS OF OIL UNDERNEATH.  The other one has a longer roof.
4SPEED427


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Dave, we're back now from a week away. If you can answer a couple of questions I might be able to help you with this.

12 bolt?

Leaf or coil spring rearend?

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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beaumontguru


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Its a standard 1/2 ton diff with coil springs,  Yes is has a 12 bolt cover plate, but its not the same 12 bolt as a car.

They were common on most 69-72 trucks with 350 engines and/or automatic trans.



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Beaumontguru

MY BEAUMONT HAS 4 STUDDED TIRES AND 2 BLOCKHEATERS......AND LOTS OF OIL UNDERNEATH.  The other one has a longer roof.
4SPEED427


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GM parts book says 67-74 ( I didn't check the 74 and up parts book) carrier # 6258088 interchanges IF you have 3.07 or 3.40 ratio. It also says carrier # 3938932 fits 3.73 or 4.10 ratio. From that I am sure it's safe to say that you have to swap carriers to put in 3.07 gears.

I am betting the carrier fits right up until they went to the 8.5" which I think was 1981?

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
beaumontguru


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Cool thanks so much for confirming this!  I was speculating that i might have to change carriers, but miss-information on the internet gave conflicting results.  It would be nice to just find a complete drum to drum setup



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Beaumontguru

MY BEAUMONT HAS 4 STUDDED TIRES AND 2 BLOCKHEATERS......AND LOTS OF OIL UNDERNEATH.  The other one has a longer roof.
4SPEED427


A Poncho Legend!

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Posts: 50202
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The one thing I didn't check and I may still some time today is the side gears. I'm not certain that they all have the same number of splines on the axle. I know on the 8.5" there was a spline count change during production and you can't interchange the complete carrier because the axles won't slide in.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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