differential interchange for big healey

[maxwedge5281]

about to purchase a 67 differential from a forum member and wanted to determine if it is a direct replacement for the differential in my 1958 bn6. so that is the question for the experts? what say ye!!!

 

[steveg]

The '67 will be a 3.91 assuming it comes from an overdrive car and your old one is a 4.11 assuming you have an overdrive car.

 

[Jerry]

As steve said, and Yes it will interchange. I would say your speedometer will be a little off, but it will work fine. I could tell the difference between my 100 6 and the Bj8 rear end, but it was slight.

Jerry

 

[HealeyRick]

Just wondering. If you're going to change rear ends, wouldn't you go for the 3.54?

 

[steveg]

Just wondering. If you're going to change rear ends, wouldn't you go for the 3.54?

Rick,
If the BN6 has the 2.6 engine and 28% overdrive, would it perhaps be best to upgrade to the 3.91 vs the 3.54?

Peter Roses has the 3.54 and 28% OD on his BN6 29D engine and it's pretty tall. Might be too tall for the 26D with 28% OD. Just thinking out loud.

 

[HealeyRick]

Rick,
If the BN6 has the 2.6 engine and 28% overdrive, would it perhaps be best to upgrade to the 3.91 vs the 3.54?

Peter Roses has the 3.54 and 28% OD on his BN6 29D engine and it's pretty tall. Might be too tall for the 26D with 28% OD. Just thinking out loud.

Steve,

You could be right. I tend to approach things from a BJ7 point of view (pre V8 conversion) and it always makes sense to seek opinions from someone that has the exact combination you're looking for before making the change.

 

[maxwedge5281]

unfortunately my bn6 has a non original 3000 engine and centershift overdrive transmission. i contemplated the 3.54 but the 3.9 will have to be it for now. thanks for the insights!!!