The Ford Barn

Fullraceflathead · 09-23-2015, 01:22 PM

I have a BB 4 speed Bell housing and was wondering what the difference is from the AA 4 speed Bell housing.

Bob C · 09-23-2015, 02:23 PM

Not sure what the difference is but they have different part numbers.

Bob

Charlie Stephens · 09-23-2015, 03:26 PM

Quote:

Originally Posted by Bob C

Not sure what the difference is but they have different part numbers.

Bob

Unfortunately when Ford Introduced the 1932's any parts that carried over from the Model A without change were assigned a new part number starting with a "B" prefix (or maybe an"18" if they were unique to the V8). This wasn't one of their better ideas and the practice stopped after 1932. After '32 the prefix reflected the first year the part was used and didn't change for subsequent years if the part remained the same.

Charlie Stephens

Bob C · 09-23-2015, 05:23 PM

Charlie, it's not the case with this part. The parts book shows both
AA-7501 1929-31 and BB-7501-A 1932-34.

Bob

Charlie Stephens · 09-23-2015, 06:53 PM

Quote:

Originally Posted by Bob C

Charlie, it's not the case with this part. The parts book shows both
AA-7501 1929-31 and BB-7501-A 1932-34.

Bob

That is a bad sign, it says it is a different part.

Charlie Stephens

old victoria · 09-23-2015, 10:18 PM

Sponsored Links (Register now to hide all advertisements)

different bolt pattern, will not interchange,

John · 09-23-2015, 10:33 PM

There is a land and groove mating surface for alignment in the AA housings. The same area in the BB housings are flat without the land and groove at the mating surfaces. The housings are not interchangeable.

John

09-23-2015, 01:22 PM	#1
Fullraceflathead Senior Member Join Date: May 2012 Location: Chillicothe, Missouri Posts: 1,176	AA 4 speed Bellhousing the same as a BB??? I have a BB 4 speed Bell housing and was wondering what the difference is from the AA 4 speed Bell housing. __________________ "If I asked people what they wanted they would have said faster horses." -Henry Ford "Primitive technology is not a design flaw" 1928 Ford Model A Roadster Pickup 1930 Gordon Smith Air Compressor 1941 Willy's Pickup 1960 Thunderbird-For Sale 1964 Buick Riviera 2x4 425 1965 Pontiac GTO, 455 Super Duty 2004 Dodge Ram SRT-10, V-10 Viper 1977 Charger Jet Boat,460 Ford,Jacuzzi Jet Front Engine Nostalgia Dragster,Supercharged 296 "Fullrace Flathead" Ford Engine Build up on DVD ask

09-23-2015, 02:23 PM	#2
Bob C Senior Member Join Date: May 2010 Location: So Cal Posts: 8,753	Re: AA 4 speed Bellhousing the same as a BB??? Not sure what the difference is but they have different part numbers. Bob

09-23-2015, 05:23 PM	#4
Bob C Senior Member Join Date: May 2010 Location: So Cal Posts: 8,753	Re: AA 4 speed Bellhousing the same as a BB??? Charlie, it's not the case with this part. The parts book shows both AA-7501 1929-31 and BB-7501-A 1932-34. Bob

09-23-2015, 10:18 PM	#6
old victoria Member Join Date: Oct 2011 Posts: 44	Re: AA 4 speed Bellhousing the same as a BB??? Sponsored Links (Register now to hide all advertisements) different bolt pattern, will not interchange,

09-23-2015, 10:33 PM	#7
John Senior Member Join Date: May 2010 Location: Richmond, VA Posts: 189	Re: AA 4 speed Bellhousing the same as a BB??? There is a land and groove mating surface for alignment in the AA housings. The same area in the BB housings are flat without the land and groove at the mating surfaces. The housings are not interchangeable. John