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Axle Conversion

JOES89K5

JOES89K5

1/2 ton status
Joined
Oct 17, 2008
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I Have 89 Blazer Like To Make The Switch To 60 Front 14bff.i Looked At A 14bff Rear From 75 Chevy Truck. Measurement 67 Inches Drum To Drum, Face 42.25 Center To Center Spring Pads. Will This Work Even Swap? I Plan On Putting On Disk Brakes W/e Brake.
 
The front D60 is a direct swap into any 69-91 blazer (with exception of brake lines depending on year of axle versus rig).

The 14ff needs to have a 42.5" center to center spring perch to directly bolt into a 73-91 blazer (3/4 ton 14ff) or 40.5" center to center spring perch to bolt directly into a 69-72 blazer (1 ton 14ff). The front driveshaft U-joint is the same but you'll need a conversion joint for the rear driveshaft.
 
Yep, what he said ^ :)

On the topic, I just got done bolting in my 14bolt and wonder if anyone has the part number for the conversion U-joint... it's 1350/1410 hybrid, yes?

That's the last thing I need to get rolling! (well besides 8 lug wheels that is!)
 
I don't have a part number for you but the 14ff is 1350 and your driveshaft is something smaller, depends on what year as there are two different conversion joints IIRC.
 
Swap

If I Did Not Want The Hasle Of Moving Spring Perches On A Rear Which Rear Out Of What Year Truck Would Be My Best Chose? What The Difference Between 3/4 And 1 Ton 14bff's Just Spring Perche Distance And Drum Size.
 
The 3/4 tons have the same spring spacing as the 1/2 tons. 1 ton rear ends have different spring spacing, you want a FF 14 bolt from a 3/4 ton truck.

Oh, and turn of the caps lock ;)
 
4X4HIGH said:
I don't have a part number for you but the 14ff is 1350 and your driveshaft is something smaller, depends on what year as there are two different conversion joints IIRC.
Click to expand...

Cool, thanks! I have a '79 and I suspect the difference in 1/2 ton rear ends is when they went from a 12 bolt to a 10 bolt... I had a 12 bolt.
 
conversion U-joint

I just got done bolting in my 14 bolt ff and wonder if anyone has the part number for the conversion U-joint. the rear diff is out of a 2004 chevy 2500 with disks. and my truck a 1984 k10 1/2 ton
 
i was doing some research and i didnt find any u-joint that converts from a 1/2 ton 1310 u-joint to a 1 ton diff with 1410 u-joint. so what i ended up doing was i got a driveshaft from a 2005 2500 chevy duramax and changed the transmission yoke to fit my truck.
 
yep thats right . the newer stuff like the axle you got went to 1410 joint. the the same size caps as 1350 but the cross center is fatter/wider.

if your doin a custom shaft best swap everything over to as big as you can so 1 ujoint size and bette strength. dont want 1310 on 1 end and 1410 on the other. it will work but not the best for beef/strength.
 
Allout what other modifications did you have to do to get that rear to fit? Hows the width? That much difference?
 
what i did was cut off the old spring purches and factory bump pad off . then i found the center on the diff and marked it. then 42 1/2 inches is the measurement from center bolt to center bolt on a 1/2 ton k 10 . i transferred measurements and it ended up being 22 1/4 from center of the diff to center on spring purch .i welded new spring purches with a 10 degree pinion angle.then i bolted up u bolts. and got a custom driveshaft . they dont make any u joint conversion for a 1410 to 1310.


i hope i explained it well.
 
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