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From: david@tekig.UUCP (David Hayes)
Newsgroups: net.auto
Subject: 4wd
Message-ID: <2497@tekig.UUCP>
Date: Thu, 28-Feb-85 14:38:54 EST
Article-I.D.: tekig.2497
Posted: Thu Feb 28 14:38:54 1985
Date-Received: Mon, 4-Mar-85 06:13:53 EST
References: <617@topaz.ARPA> <289@mhuxj.UUCP> <895@vax1.fluke.UUCP> <1927@sdcc6.UUCP> <910@vax1.fluke.UUCP>
Organization: Tektronix, Beaverton OR
Lines: 48

> > 
> > As a matter of fact on some four wheel drive vehicles the front and rear
> > ratios are slightly different. 4.10 to 1 as opposed to 4.11 to 1 for
> > 
> > Christopher Latham
> > U.C.San Diego
> 
> Because the front drive shaft is offset, the difference in differential ratios
> is probably to compensate for some gearing in the transfer case.  The wheels
> would then turn at the same speed, front and rear.  This makes the only sense.
> Since most people know so little about 4W drive train components, I am willing 
> to go to Off-Road Mail column to get the correct answer.  I am curious myself.
> By the way the orginal posting was about rotating tires.  Every tire dealer I
> have talked to says you must rotate tires on a 4-wheel drive.  Dick Cepek,
> (Largest retail off-road tire dealer) recommends rotation every 5K mi., 2.5K if
> you have posi.  I typically get 40-45K from my mud tires.  This is excellent
> considering the wild tread pattern.
> 
> 
> DAC

I thought the reason for the different drive ratios was the physical
size difference of the ring gear in some front versus back applications.
Like a Dana 44 being 4.11 while the closest Dana 30 ratio is 4.10
due to the smaller diameter, different tooth size etc.

My CJ5 has a T-18 transfer case which offsets both front and rear
drive lines, they actually are connected to the same shaft, so they
have to be turning the same speed.  Does anyone have any experience 
with the Dana 20 transfer case?  This is regarded as a "straight thru"
type that is supposed to be stronger than the T-18.  Does the rear
driveline come straight off the back, in line with the transmission
main shaft?  Also, does this setup put more of an angle on the rear
driveline in lifted applications?  Will the Warn overdrive work here?

After slogging around in the muck, I usually pop back into 2wd, even
on the hard pack dirt roads back to camp, just to make sure I don't
risk windup.

Has anyone converted front drum to disc?  There is a kit available
for around 300 bucks, but can I buy a hub/ rotor, caliper, and 
make my own bracket for less??

Any info or just conversation of your 4 wheeler is appreciated.


Tektronix!tekig!david