All Small Six Rear End ID Help

[Dzbowtie]

All,

I’m currently working on a 68 Falcon, 200 I6 Canada car. I’m not familiar with small ford cars and need help identifying this rear end. There are no tags or markings that I can find, and as can be seen it’s a 8 bolt cover. The rear ratio is 3.20 and it’s a 4-lug axle. I appreciate any help.

 

[aussie7mains]

We had those tiny rears in our pre65 falcons, its a 6.75 or 7.25 integral carrier, no LSD is available and they are all 2 pinion. OK with a small six, but likely to break with with a decent 250. A mate of mine ran one with an auto 250-2v down here, and got away with it. Here we go to a Borg Warner 78 (Camaro 8 bolt) or 9 inch.

 

[Dzbowtie]

I appreciate the info. I found a chart that showed the late 60s falcons with 3.20 were only in 7.25 ring gear.

 

[mustang6]

Actually there was a limited slip diff available for the 7.25, rare but you see them for sale online sometimes. Not that it’s worth doing unless you really want to stick with the small integral rear.

 

[bmbm40]

All,

I’m currently working on a 68 Falcon, 200 I6 Canada car. I’m not familiar with small ford cars and need help identifying this rear end. There are no tags or markings that I can find, and as can be seen it’s a 8 bolt cover. The rear ratio is 3.20 and it’s a 4-lug axle. I appreciate any help.

Is the ratio different for c4 and manual transmission equipped cars?

 

[chad]

auto-catelogue should have that bmbm. Find some cars w/C4, look them up on ac. (C ‘drive-line', ⬆︎ rear gear). My bent6
has lots almost identical to the i6 - both low rev, tq buddies (both near 4L).

I’d not go 9 inch due to weight/over kill (just me tho). Same w/more modern 8.8 and 7.5. The ’70/4 Mav is closer. The other uses of 8 inch also ideal (chero 8, station wagon). There’s 9 or 10 ratios there too (typical ford 3 or 310 - 4:11). Also its good to 300 HP, U dont need the 9’s 400 - 800 HP duty. Y take the extra weight?