Now that you mention it, the magnesium case does sound familiar. Good to know.
Anyone have any thoughts on whether it's better to put the NP208 back in? Or is it really no issue?
It's interesting you say a ZF5 with 3.73 or 4.11 gearing, since that's exactly what I have been thinking.
The first 2 gears of the 3.55s with the ZF5 actually have the same final ratio as the 3.00 with the NP435. So, the "granny low" and the starting gear are essentially the same (it's why I never swapped in a ZF and a 3.50 gear 9" into my '81. Besides a little overdrive, it'd be a lot of work for a little gain).
NP435
3.00 x 6.69 = 20.07
3.00 x 3.34 = 10.02
3.00 x 1.79 = 5.37
3.00 x 1.00 = 3.00
ZF5
3.55 x 5.72 = 20.31
3.55 x 2.94 = 10.44
3.55 x 1.81 = 6.43
3.55 x 1.00 = 3.55
3.55 x 0.76 = 2.70
But with 3.73s or 4.11s, I'd gain more low end grunt and still have decent highway manners. The 4.11 x 0.76 = 3.12 which is just about what my 3.00 with my NP435 is. I think it'd be a great combo.
In the mean time, the body shop sent me some pictures of the progress.
Anyone have any thoughts on whether it's better to put the NP208 back in? Or is it really no issue?
It's interesting you say a ZF5 with 3.73 or 4.11 gearing, since that's exactly what I have been thinking.
The first 2 gears of the 3.55s with the ZF5 actually have the same final ratio as the 3.00 with the NP435. So, the "granny low" and the starting gear are essentially the same (it's why I never swapped in a ZF and a 3.50 gear 9" into my '81. Besides a little overdrive, it'd be a lot of work for a little gain).
NP435
3.00 x 6.69 = 20.07
3.00 x 3.34 = 10.02
3.00 x 1.79 = 5.37
3.00 x 1.00 = 3.00
ZF5
3.55 x 5.72 = 20.31
3.55 x 2.94 = 10.44
3.55 x 1.81 = 6.43
3.55 x 1.00 = 3.55
3.55 x 0.76 = 2.70
But with 3.73s or 4.11s, I'd gain more low end grunt and still have decent highway manners. The 4.11 x 0.76 = 3.12 which is just about what my 3.00 with my NP435 is. I think it'd be a great combo.
In the mean time, the body shop sent me some pictures of the progress.


