Looking for KPI specs
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Mountain Pass
Joined: Jun 2011
Posts: 139
Likes: 24
From: Leesburg
Looking for KPI specs
I'm working on a project to upgrade a late 50's truck from drum brakes in the front to disk brakes. Aside from many challenges associated with doing this, the main issue I've boxed myself in with is I need to keep the old lug pattern of 6 with 8.75" bolt circle.
I came across an 84 F700 which has a 7K lbs front axle which has the proper lug bolt pattern. Unfortunately the axle as a whole is about 10 inches to wide to use as a direct swap. I measured the king pin boss on the axle (3.25" tall) which appears to be the same as the axle in my truck. Now I need to determine if the king pin inclination (KPI) is the same as my truck. I beleive my truck to be 9 degrees. There are more challenges to go, but I'm first trying to determine if I'm in the ball park to use the spindle assemblies off the F700 as a "bolt on" to my existing axle. Does anyone have, or know where to find measurement specs for the axle in the F700?
PS: Thanks Bill (AKA numberdummy) for helping me identify the F700
I came across an 84 F700 which has a 7K lbs front axle which has the proper lug bolt pattern. Unfortunately the axle as a whole is about 10 inches to wide to use as a direct swap. I measured the king pin boss on the axle (3.25" tall) which appears to be the same as the axle in my truck. Now I need to determine if the king pin inclination (KPI) is the same as my truck. I beleive my truck to be 9 degrees. There are more challenges to go, but I'm first trying to determine if I'm in the ball park to use the spindle assemblies off the F700 as a "bolt on" to my existing axle. Does anyone have, or know where to find measurement specs for the axle in the F700?
PS: Thanks Bill (AKA numberdummy) for helping me identify the F700
Posting Guru
Joined: Feb 2010
Posts: 2,006
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From: CASA GRANDE AZ
have you thought about shortening the new axle ?
Anyone shortened a front axle? - WeldingWeb™ - Welding forum for pros and enthusiasts
Anyone shortened a front axle? - WeldingWeb™ - Welding forum for pros and enthusiasts
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Mountain Pass
Joined: Jun 2011
Posts: 139
Likes: 24
From: Leesburg
Hmmm.... I sense a hint of sarcasm hidden in there 
As you can see I haven't gotten any feedback yet on the "shortening" ask in that thread. The one useful feedback was the "swapping of the spindles at the king pins" that got me doing the extra measuring and has me real close to believing I can swap them. My hope is someone here knows the specs on the F700 axle so I can measure that against my existing axle. If I can't find the data then my next step is to spend a day in a junk yard to tear one apart and measure angles, diameters, etc. I know it will ultimately come down to that, but welcome any and all wisdom I can find.
As you can see I haven't gotten any feedback yet on the "shortening" ask in that thread. The one useful feedback was the "swapping of the spindles at the king pins" that got me doing the extra measuring and has me real close to believing I can swap them. My hope is someone here knows the specs on the F700 axle so I can measure that against my existing axle. If I can't find the data then my next step is to spend a day in a junk yard to tear one apart and measure angles, diameters, etc. I know it will ultimately come down to that, but welcome any and all wisdom I can find.
Posting Guru
Joined: Feb 2010
Posts: 2,006
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From: CASA GRANDE AZ
no sarcasm meant , looked for info and could not find none ! I have cut and welded some straight axles in the past so that is what i would most likely do !
and that link showed that there might be a possible axle that would work if you can find one !
I made a great discovery today, followed by a dissapointing one. It turnes out the early to mid 90's UPS delivery trucks have the perfect match front axle to swap into these older trucks. The dissapointment is UPS does not sell any trucks, whole or parts, making the axles unobtainable. Maybe someone knows of a similar truck and junk yards that have them? It appears I'm looking for an early/mid 90's Grumman or International step van with the 6 lug axle, 8.75" bolt circle. If I can find one, then no cutting required
and that link showed that there might be a possible axle that would work if you can find one !
I made a great discovery today, followed by a dissapointing one. It turnes out the early to mid 90's UPS delivery trucks have the perfect match front axle to swap into these older trucks. The dissapointment is UPS does not sell any trucks, whole or parts, making the axles unobtainable. Maybe someone knows of a similar truck and junk yards that have them? It appears I'm looking for an early/mid 90's Grumman or International step van with the 6 lug axle, 8.75" bolt circle. If I can find one, then no cutting required
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