4.56 and 33's

[phyler]

After talking with Eck, I'm almost convinced to go 4.56's with the ZF that I have sitting in the garage. I'm curious if anyone else has run this combo with a 33" tire? Looking at the grim keeper calculator and using actual tire heights, it doesn't seem to be a big difference between the 33 I'll run and the 35 that Eck runs.

There's a guy selling a 9" drop out with posi that was rebuilt at Colorado axle and gear that I'm thinking about doing vs rebuilding mine.

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[Justin]

What engine are you running?

[phyler]

What engine are you running?

Currently the stock 302 but have the 351w that came with the zf5. That still needs to be rebuilt and probably won't be for awhile.

I have the np435 with 3.50 and a Lock-right today.

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[Justin]

As you noted the difference isn't that big-a few hundred rpm. The 302 likes to spin a little more than the 351w will. It mostly depends on your priorities. Do you want better fuel economy and modern highway rpms or a little more scoot and not having to downshift? For comparison, ill be running 4.56 with a 351w on 37s, assuming I can ever figure out why I'm having lean issues and drive the dang thing.

[phyler]

As you noted the difference isn't that big-a few hundred rpm. The 302 likes to spin a little more than the 351w will. It mostly depends on your priorities. Do you want better fuel economy and modern highway rpms or a little more scoot and not having to downshift? For comparison, ill be running 4.56 with a 351w on 37s, assuming I can ever figure out why I'm having lean issues and drive the dang thing.

At this point, I'm like you, I'd have to drive it first before I care about those other things. [emoji1787]

I'm not terribly concerned with mileage. With the worn 302, I'm sure 4.56's will make it feel a lot better. I'm thinking with 4.56's it would feel a lot like what I have now with just one more gear in the mix vs using 3rd for everything between 20 and 50mph.

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[Justin]

For sure. It'll be a big upgrade either way and 4.56 would give you some breathing room for larger tires if you wanted to go bigger.