Big Bob IFS front end
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5th Wheeling
Joined: Feb 2007
Posts: 47
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From: Farmington, NM
Big Bob IFS front end
Have the Big Bob IFS front end - but no rotors sent. Have spindles GM 371876 RH & 371875 LH. Appears the bolt pattern to be 5 x 4 1/2" with 1/2" stud. The adapter/spacer that came with it seems to have that 5 x 4 1/2" with 1/2" stud to convert to Ford 5 x 5 1/2" pattern.
Parts store here states GM only had the 5 x 4 3/4" bolt pattern for that spindle. So need help finding the correct rotor so I can continue on my 1955 F100 project.
Parts store here states GM only had the 5 x 4 3/4" bolt pattern for that spindle. So need help finding the correct rotor so I can continue on my 1955 F100 project.
Fleet Owner
Joined: Jul 2004
Posts: 27,294
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From: NM
Look at the Questions on this Speedway kit's page, I think you are incorrect in assuming the rotors are GM parts. 1948-1956 Ford Half Ton Deluxe Disc Brake Kit, 5 x 4-1/2 Inch - Speedway Motors, America's Oldest Speed Shop
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5th Wheeling
Joined: Feb 2007
Posts: 47
Likes: 0
From: Farmington, NM
You are correct after some research - the rotor is Ford, I believe 77 or 78 Granada 11". Looks like the Speedway setup uses the original Ford spindle - so do not know if it will fit the GM spindle. The spindle has GM stamping on it (GM 371876RH-15). However the Ford rotor outer bearing hits the tapering up part of the spindle where it cannot be tightened correctly - too much play. So now, what Ford rotor fits the GM spindle? Would really like to know so I can get this truck up on the Big Bob IFS
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