Ford Differential's

[Alaska Jim]

Is there an easy way to tell the difference between a 9" Ford 3rd member, and a 9 3/8 Ford 3rd member, other than tearing it down ? There is no tag on the Diff. I have, but the rear of the housing is smooth like a 57 wagon Diff. , but the axles are 5 0n 5 1/2.. This makes me think that maybe it was a truck diff. , but I have not seen this smooth rear on trucks. Any help would be appreciated. Thanks, --Jim

[KULTULZ]

Here is a very brief description of the FORD 9 3/8"-


http://www.kevinstang.com/Ninecase.htm

[Alaska Jim]

Kultulz, Thank you for the link, very interesting reading. I may have to print that out and put it in my files. Thank You.

[poolplayer1]

Yes, thank you very much for posting the link to the different differentials.When I got my 55 ford station wagon from my dad,( many years ago),I changed the differential cause it was geared too low.I had changed the engine to a 302 with a C4 automatic tranny and while going down the road,the 55 differential felt like it was running in low gear.
So, I got one from a 57 ford and did some changes to the driveline and it worked great.
Runs really nice now with this 302 and C4 tranny.
Thanks again.
Mando

[JeffB2]

Originally Posted by poolplayer1

Yes, thank you very much for posting the link to the different differentials.When I got my 55 ford station wagon from my dad,( many years ago),I changed the differential cause it was geared too low.I had changed the engine to a 302 with a C4 automatic tranny and while going down the road,the 55 differential felt like it was running in low gear.
So, I got one from a 57 ford and did some changes to the driveline and it worked great.
Runs really nice now with this 302 and C4 tranny.
Thanks again.
Mando

1955-56 Station wagons used Dana 44's with a 302 & AOD you have a nice set up,that .67 overdrive is great on the highway.

[paul2748]

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Yes the 5 on 5 1/2 is a truck bolt pattern

Originally Posted by Alaska Jim

Is there an easy way to tell the difference between a 9" Ford 3rd member, and a 9 3/8 Ford 3rd member, other than tearing it down ? There is no tag on the Diff. I have, but the rear of the housing is smooth like a 57 wagon Diff. , but the axles are 5 0n 5 1/2.. This makes me think that maybe it was a truck diff. , but I have not seen this smooth rear on trucks. Any help would be appreciated. Thanks, --Jim

[paul2748]

Did poolplayer say he had an OD? He mentioned a C4 which is not an OD trans.

Originally Posted by JeffB2

1955-56 Station wagons used Dana 44's with a 302 & AOD you have a nice set up,that .67 overdrive is great on the highway.

[scicala]

Originally Posted by paul2748

Yes the 5 on 5 1/2 is a truck bolt pattern

I know '55 Mercury's had a 5 1/2" bolt circle too. Maybe other year Mercury's too ?


Sal

[Alaska Jim]

My '51 Merc. has the 5x51/2 pattern