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 > Rear gear ratio

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ppine

Northern Nevada

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Posted: 11/02/20 08:24am Link  |  Quote  |  Print  |  Notify Moderator

See if you can add a Warn overdrive. Changing the rear end is somewhat expensive.

Grit dog

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Posted: 11/02/20 02:01pm Link  |  Quote  |  Print  |  Notify Moderator

ppine wrote:

See if you can add a Warn overdrive. Changing the rear end is somewhat expensive.


???
Aren't those just for Jeeps? Never seen a heavier duty one and don't they bolt onto a transfer case? And they cost way more than re-gearing a good axle.

Your suggestion will only serve to confuse the OP, as it is not even remotely a valid solution.

Heck you can buy a built AOD trans for the same amount as a vintage Jeep OD unit (that doesn't work anyway) and might even get lucky on driveshaft length.


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T18skyguy

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Posted: 11/02/20 07:02pm Link  |  Quote  |  Print  |  Notify Moderator

theoldwizard1 wrote:

T18skyguy wrote:

You might look into a Gear Vendors Overdrive. It works great with the C6 and you'll have 6 speeds. It's a nice setup and they been around forever.

Yes, but they are expensive.

That's true, but maybe subtracting the cost of re-gearing might make it a consideration, especially the good performance up the mountains and a 6th speed for the straights.


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76 Rambler

Kansas City, Mo.

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Posted: 11/03/20 10:30am Link  |  Quote  |  Print  |  Notify Moderator

Pretty sure its a 456

time2roll

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Posted: 11/03/20 10:36am Link  |  Quote  |  Print  |  Notify Moderator

And what RPM do you want to be running at 65? 3.73 would put you at 2580 rpm.


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76 Rambler

Kansas City, Mo.

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Posted: 11/03/20 02:01pm Link  |  Quote  |  Print  |  Notify Moderator

I found a gear ratio / rpm calculator on line, and that's about what it said it would do, which is still a little high, but I'll settle for. Im just hoping that going from 456 to 373 isn't too much loss on the low end. I did look into gear vendors and it looks like around a 3k upgrade. Between the motor rebuild, exhaust, and new carb, I'm in the mechanical for alittle over 3k. Dollars are starting to stack up, and I haven't started on the inside yet. It's not in desperate need, but definitely needs updated. Exterior is in surprisingly good shape. Paid $1500 for it in unstable running condition.

Grit dog

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Posted: 11/03/20 05:52pm Link  |  Quote  |  Print  |  Notify Moderator

Depends how much snort it feels like it has now and where you're driving it.
From KC, anything within a 700mi radius of you minimum, I'd put 3.73s behind a healthy big block and call 'er good.
If planning on hitting the Rockies, the elevation and grades will turn your fire breathin 460 into something much less desirable and the reason it came with 4.56s to begin with.
JMO

pnichols

The Other California

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Posted: 11/03/20 06:55pm Link  |  Quote  |  Print  |  Notify Moderator

Of course the OP can change to larger diameter tires to drop RPM versus speed - without messing with gearing changes.

I did this on our small Class C MH in order to counter it's 4:56 ratio rear differential gearing.

As a bonus, you also get more ground clearance and improved tire wear from larger diameter tires.


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76 Rambler

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Posted: 11/03/20 08:25pm Link  |  Quote  |  Print  |  Notify Moderator

What sucks about that, is that I just put new shoes on it!

time2roll

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Posted: 11/03/20 08:40pm Link  |  Quote  |  Print  |  Notify Moderator

You would need a 6" taller tire to go 4.56 to 3.80 equivalent ratio. Yes a 30" to 36" tall tire.

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