Re: [AMC-list] time to find a stout 5 spd tranny now i think.

[Frank Swygert <farna@xxxxxxx>]

The tires aren't too tall, though I use a size or two smaller to reduce diameter and help a bit. All FSJs are 4x4, Jeep didn't make another 2WD until the Commanche came out in 86 or 87, everything prior to then was 4x4 back to 63. The old Willys wagon could be had in 2x4, and maybe the Willys pickup, possibly after 63. The 4x4 stuff is mainly more weight when in 2x4 mode. So throw a couple hundred pounds in the back of the wagon and go! The good thing about the 4x4 is you have low range, but it's a 4:1 ratio! Top speed is about 50 mph, and the six sounds like it might want to come apart if pushed any further then (I've never gone over 45 in low range). If only the t-case was synchronized so you could go from low to high on the move! Even the Commanche with five speed only had 3.08 gears, not really low enough, but 1st gear is a bit lower in those, 5th only useful for interstate cruising at 60+. Lower and you have to shift out of OD for all but minor hills. I have a Holley 390
/4V carb on mine with a Clifford intake. It will cruise at 75-80, but gas mileage is cut nearly in half doing. Did it once, checked mileage -- 10 mpg. It normally gets around 17-18 in all around driving.

------------
Date: Tue, 1 Jun 2010 14:08:11 -0700
From: tom jennings<tomj@xxxxxxx>

On Tue, Jun 1, 2010 at 11:11 AM, Ken Ames<ameskg@xxxxxxxxx>  wrote:

>  Yep, you don't want to be in a hurry. My 85 J10 has a 258 that's getting a
>  bit
>  tired even with just 135,000 kms (84000 mi). With 2.72 diffs it has to work
>  hard
>  all the time. Most headwinds have it running a lot of throttle just to keep
>  60mph.

That's a bummer. It's all in the gearing; my 232-powered station wagon has a
3.33? axle and runs 65 - 70 mph all day. Air-cooled BW auto trans. Fully
loaded hauling a camp trailer and krap four 3 people for a week it'll do
60mph all day on the flat and level. it did that too with a Carter YF.

2.72 seems like a steep axle. Is it 4wd? Is the 4-wheel stuff that much of a
power loss? Maybe too-tall tires for that axle?

--
Frank Swygert
Publisher, "American Motors Cars"
Magazine (AMC)
For all AMC enthusiasts
http://www.amc-mag.com
(free download available!)


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