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Old 04-18-2019, 07:11 PM   #1
bigtexasrob
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14-bolt Parts Compatibility

All right, long story short, I threw away the axle I needed, kept the axle with the diff I needed, and bought an axle I thought I needed.

Truck in question is a ‘74 C30 Dually. The axle under it currently is a SRW 14 bolt with an open 3.42 out of a ‘93 C2500. The axle I just picked up (without doing any measuring like an idiot) is a dually, open 4.09 that appears to be from a cab and chassis (meaning it’s the stubby 63.5” WMSW instead of the 72” dually.)

My question is this: how much of these two axles can I hodgepodge together and how close will it get me to the 72” dually with 3.42 final drive?
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Old 04-18-2019, 10:05 PM   #2
sweetk30
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Re: 14-bolt Parts Compatibility

you need the 72" wms to wms drw wide axle housing as the tubes and shafts are wider .

if you cant find one and need to be close g-vans up to 1995 i know can be had with a 70" wms to wms then some swaping work with parts and welding axle backing plate flanges further in for the brakes to work on them for drw hubs and brakes . but you will be 1" each side to narrow compared to the correct wide drw axle .

also check motor homes they get a wide axle under them . i have one thats a dana 70 and around 74" wide .

as to the guts swapping thats super easy to do on the 14ff axles . so look for the housing width you need and swap in your 3.42 guts.
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85-k30lb the plow machine build .
85-c10sb summer fun toy .
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Old 04-18-2019, 10:19 PM   #3
bigtexasrob
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Re: 14-bolt Parts Compatibility

So basically this one’s worthless �� sweet.
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Old 04-19-2019, 01:49 AM   #4
kwmech
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Re: 14-bolt Parts Compatibility

The majority of the 72'' dually axles were Dana 70HDs
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Old 04-19-2019, 09:42 AM   #5
sweetk30
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Re: 14-bolt Parts Compatibility

Srw and c&c narrow are the same housing just hubs and brakes are different . The wide drw axle is its own animal . You can find 14ff units but most were Dana 70 hd rear .
__________________
77-k30lb BIG truck build .
87-k30lb budget beater build .
85-k30lb the plow machine build .
85-c10sb summer fun toy .
-----------------------------
HOLLEY SNIPER efi = worst case of p.i.t.a i ever had .

EDELBROCK pro flo 4 = best deal going so far . love my setup works great.
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Old 04-19-2019, 04:25 PM   #6
bigtexasrob
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Re: 14-bolt Parts Compatibility

Quote:
Originally Posted by sweetk30 View Post
Srw and c&c narrow are the same housing just hubs and brakes are different . The wide drw axle is its own animal . You can find 14ff units but most were Dana 70 hd rear .
By measure the WMS on the C&C is shorter than my single and shorter than the previous dually 14ff.
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1974 C30 Dually Longbed
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Old 04-20-2019, 08:29 AM   #7
sweetk30
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Re: 14-bolt Parts Compatibility

Cause the hubs suck in the wms but the shafts and bare housing are the same like I said .
__________________
77-k30lb BIG truck build .
87-k30lb budget beater build .
85-k30lb the plow machine build .
85-c10sb summer fun toy .
-----------------------------
HOLLEY SNIPER efi = worst case of p.i.t.a i ever had .

EDELBROCK pro flo 4 = best deal going so far . love my setup works great.
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Old 04-20-2019, 11:05 AM   #8
sweetk30
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Re: 14-bolt Parts Compatibility

here is the bible of 14ff stuff http://www.pirate4x4.com/tech/billav...ble/index.html
__________________
77-k30lb BIG truck build .
87-k30lb budget beater build .
85-k30lb the plow machine build .
85-c10sb summer fun toy .
-----------------------------
HOLLEY SNIPER efi = worst case of p.i.t.a i ever had .

EDELBROCK pro flo 4 = best deal going so far . love my setup works great.
sweetk30 is offline   Reply With Quote
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