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Author Topic: 14bsf to 14bff swap?  (Read 2404 times)

Offline csdineley

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14bsf to 14bff swap?
« on: March 25, 2013, 11:16:46 AM »
Hello

I wondering how hard would it be to swap a 14bff into my truck with a 14bsf?
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1987 V20 Custom Deluxe, Vortec Headed 350, SM465,Np205 14Bff 4.10

Offline Captkaos

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Re: 14bsf to 14bff swap?
« Reply #1 on: March 25, 2013, 01:11:34 PM »
If it is an early model regular cab it will bolt right in.  What is the donor?
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Offline csdineley

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Re: 14bsf to 14bff swap?
« Reply #2 on: March 25, 2013, 01:18:39 PM »
1986 GMC 1-ton srw. Everything looks like it would bolt up but the shock mounts.
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1987 V20 Custom Deluxe, Vortec Headed 350, SM465,Np205 14Bff 4.10

Offline Blazin

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Re: 14bsf to 14bff swap?
« Reply #3 on: March 25, 2013, 02:12:10 PM »
It will bolt in. Shock mounts might need to be modified, or swapped from the semi floater. U joint might have to have a combonation joint.
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Offline pholliday1

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Re: 14bsf to 14bff swap?
« Reply #4 on: March 25, 2013, 03:32:03 PM »
That's a huge upgrade you'll be glad you did.
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Offline Engineer

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Re: 14bsf to 14bff swap?
« Reply #5 on: March 25, 2013, 10:26:13 PM »
NO!

If the 14-bolt FF is out of a 1-ton the spring seats are narrower than your 3/4-ton. You need to find a 14-bolt FF from a 3/4-ton, or be prepared to cut and reweld the new axle's spring seats.
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