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Old 05-30-2007, 02:47 PM
Dean Dean is offline
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Join Date: Apr 09, 2000
Location: Medford,Oregon
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Q. What is required to put 1978 axles in 1973 j4000?

Hi, a coworker is looking at buying a 1978 J10 with J20 axels under it and putting the axels in his 1973 J4000. I am going along for the ride (and leftover parts). What do we need from the doner truck besides the axels?
The truck is some distance away and time is limited on pulling parts.

TIA, Dean.
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Old 05-30-2007, 04:41 PM
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Tad Tad is offline
 
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Location: Out West
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Your friends '73 is a post mount suspension front and back, the '78 is not.
The front perches on the J20 axles are inset more and are for an SUA mouting, the '73 stock front perches are outboard more and SOA.
Two options there.
Add new perches to the J20 axle to mimic the placement of the perches on the '73 axle. Add hangers to the frame up front to mimic the 78 front spring hanger locations.
The rear should bolt up fine, perches may need to be moved but not as I recall.
I would grab all the driveshaft, brake and steering stuff that's there if that's an option also.

There's going to more to it than that but I wanted you to know the front axle is not just a bolt in deal.
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Old 05-30-2007, 07:01 PM
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Rande Rande is offline
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Realize the '78 axle has disc brakes so the master cylinder and proportioning valve from the '78 have to go with the front axle. The front brake flex lines will need to be '78 items also. Not sure if the flex line fittings at the frame will be the same. The front hard lines may have to '78 also.
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