NAA / 600 Differential

[newlife]

I am working on the differential of my NAA. The pinion gear had some chipped teeth and so I wanted to replace it. The manual said that a 600 differential could be used if the side gears are changed. I found one cheap and purchased it. It just came in and it is not the correct differential. The pinion carrier is larger and will not fit into the case to start with. I am wondering if the manual is wrong or if I was sent the wrong parts. Has anyone swapped a Ford 600 differential with one from an NAA? Anything else I am missing? Thanks for the help.

 

[Dean]

The 6xx series differential is completely different than that used in the NAA.

Dean

 

[Anonymous-0]

The Naa differential housing was weak, only used for 1 year.Thats why I bought a 640.

 

[Sean in PA]

(quoted from post at 05:44:31 02/25/12) The Naa differential housing was weak, only used for 1 year.Thats why I bought a 640.

Rear axle housing for NAA was made for 2 years, from 1/1/1953 - 12/31/1954.

 

[ford 600]

I dont know what manual you have, but info is not right. You need NAA parts only to do the job right Over the years I have seen several NAA with an 8N-9N diff cobbled in, not pretty but did work. Buyer beware, huh.

 

[newlife]

Thanks Ford 600

I think the actual differential would work if the axle drive gears are changed with NAA parts but it seems the pinion assembly is completely different. The 600 pinion assembly is much larger and stouter. Guess I will try to sell the 600 differential and find a NAA pinion or complete unit.

 

[fordtractorpro]

Everyone is correct so far.
I went thru with a guy. I sold him a pinion and
ring gear which i removed from a naa. They were 8n parts someone put in. I had to send him another set after we verified the part number
so we didn't have to do it again.
I have another naa rear if you need a correct set.