Good Sam Club Open Roads Forum: Class C Motorhomes: Rear gear ratio
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76 Rambler

Kansas City, Mo.

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Posted: 11/03/20 09:45pm Link  |  Quote  |  Print  |  Notify Moderator

I can only imagine what that'd look like. It already has the muscle car stance!

pnichols

The Other California

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Posted: 11/03/20 11:13pm Link  |  Quote  |  Print  |  Notify Moderator

76 Rambler wrote:

I can only imagine what that'd look like. It already has the muscle car stance!


"It already has the muscle car stance!"

How so? i.e. is it a 4X4 Class C?

(After putting larger diameter tires on our 2WD E450 Class C, it definitely has lost it's OEM look of an RV "riding on donuts", but not quite like a muscle car.)


Phil, 2005 E450 Itasca Spirit 24V

76 Rambler

Kansas City, Mo.

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Posted: 11/04/20 06:49am Link  |  Quote  |  Print  |  Notify Moderator

It won't let me upload a pic. It's taller in the rear end by probably 5 inches.

ppine

Northern Nevada

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Posted: 11/05/20 09:16am Link  |  Quote  |  Print  |  Notify Moderator

Try some larger tires.
If you can afford a new rear axle, consider a different trans.

time2roll

Southern California

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Posted: 11/05/20 10:21am Link  |  Quote  |  Print  |  Notify Moderator

The official rv.net photo posting upload site:

http://photoposting.is-great.net/?i=1


2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
675w Solar pictures back up

Bordercollie

Garden Grove, CA, USA

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Posted: 11/06/20 10:08am Link  |  Quote  |  Print  |  Notify Moderator

Our 72 Dodge Van camper conversion also came with a low ratio rear end. Wife would beat kid's cars from stop signs.

PatJ

Eastern WA

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Posted: 11/09/20 07:43pm Link  |  Quote  |  Print  |  Notify Moderator

I'm on my third RV which is a 2019 Ford C with 4.56 and a 6 speed with double overdrive, so NA.

My previous RV was a SB Chevy with 4.56 axle and a Chevy TH400 (the GM version of a C6.) It was exactly as you describe. It did really well at 55 MPH (even with light towing,) but dropped off hard above or below that speed. When I had that rig I fantasized about re-gearing or adding an OD trans, but in reality I probably didn't have the power to support it (stock SB Chevy roughly 175 HP.)

My first RV was also a small block Chevy but 3.73 axle. IMO this was the ideal ratio for a non-lockup 3 speed trans with 3rd direct. This was my shortest and lightest RV of the three, but also was the oldest (1975) had the least HP of the three. But still it did very well on the highway 60-65 MPH and was a joy to drive even by modern standards. If you re-gear keep stock size tires and a direct-3rd trans I would shoot for 3.73ish. That's with me assuming Ford and Chevy from the same vintage are roughly equivalent. Just my opinion


Patrick

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