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Jul 21st, 2025 | | | | Joined: Oct 2014 Posts: 124 'Bolter | | 'Bolter Joined: Oct 2014 Posts: 124 | Is there any difference between a 3600 front axle beam and spindles compared to a 3800 axle beam and spindles? The reason I'm asking is I have a 3600 axle with new kingpins already installed and I would like to put it under my 3800 which needs new pins and bushings. | | | | | Joined: May 2011 Posts: 153 'Bolter | | 'Bolter Joined: May 2011 Posts: 153 | John L.
The 3800 series uses a 2" wide spring in the front and the 3600 uses a 1-3/4" wide. So the hole locations where the U-blots go thru the axel would be different. I don't think there are any other differences than that, but please someone else join in with more information.
Tom | | | | | Joined: Aug 2018 Posts: 1,003 'Bolter | | 'Bolter Joined: Aug 2018 Posts: 1,003 | hi John L
assuming you are looking at AD years here,
the 3600 front axle shares more parts with the 1/2 ton than the 1 ton trucks
the axle iBeam is unique to the 3600
the 1 ton front leaf is 40 inches center to center on the knuckles
however the 3/4 and 1/2 ton trucks are only 38 inches on that dimension so it's a no go for your 1 ton
3600 I-Beam axle:
46-52 3/4 TON (exc. D-D), forged 3681642, #3680905
53-54 3/4 TON (exc. D-D), forged 3698295, #3698294
the tie rods, tie rod ends and leaf springs are shared between 1/2 and 3/4 ton
springs:
47-52 1/2, 3/4 TON (exc. D-D) 8 leaves, 3693911
47-54 1/2, 3/4 TON (exc. D-D) 8 leaves, 1-3/4 inch, 3702793
LMC truck: 34-2951
classicparts: 74-421
tie-rod:
46-54 1/2, 3/4 TON (exc. D-D), 43-3/16 O.L.-3/4-16 thread, 367528
tie-rod end:
46-54 1/2, 3/4 TON (exc. D-D), left (4-59/64 long)(25/32-16 L.H. thd. - stmpd. "L"), 374227
46-54 1/2, 3/4 TON (exc. D-D), right (4-59/64 long)(25/32-16 R.H. thd. - stmpd. "R"), 374226
-s | | | | | Joined: Oct 2014 Posts: 124 'Bolter | | 'Bolter Joined: Oct 2014 Posts: 124 | Ok, Thanks for the information. | | | | | Joined: May 2005 Posts: 8,877 . | | . Joined: May 2005 Posts: 8,877 | It's my understanding that the axle forging is the same for the AD 3/4 and 1 ton and light duty 1.5 ton.
True the spring width is different (1.375" for 3/4 ton) and therefore the u-bolt holes are drilled differently in the axle pads. I believe when new they used a different dab of paint color to indicate the difference between these otherwise identical, including forging/part number, axles.
Spindles I think are the same for 3/4, 1, and light 1.5 ton.
Back to the original question. If you're handy with a rat tail file you could slot each u-bolt hole 1/8" wider and use the 3/4 ton axle and spindles in the 1 ton. I have not done so, but fully believe it is possible. I have used 3/4 ton hubs (only) on a 1 ton axle/spindle, no issues. | | |
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