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Re: [oletrucks] <Tech E - Long> Using Mopar 3-spd OD trans in

To: <GremlinGTs@aol.com>, <oletrucks@autox.team.net>,
Subject: Re: [oletrucks] <Tech E - Long> Using Mopar 3-spd OD trans in
From: "jcerniglia" <jcerniglia@email.msn.com>
Date: Sat, 3 Mar 2001 11:58:05 -0500
Very interesting concept, but the most important thing to remember
that these trucks were never designed to travel at todays highway
speeds. The brake system on them with the original drums and
non power brake will make traveling at those speeds extremley
dangerous as you would never be able to stop in a quick enough
time if need be on the highway. It all comes down to if you plan
on re gearing your truck wether it be through gears or a tranny
swap like this one, allways plan on at least converting the front
to power disc brakes, well the whole brake system will be power
but the rear can be left as with the original drums to mirror todays
production trucks, just my two cents.

Jeff Cerniglia
Bristol Ct.
59 GMC Fleetside
57 Chevrolet Belair
64 Pontiac Catalina
47 Harley Flathead
-----Original Message-----
From: GremlinGTs@aol.com <GremlinGTs@aol.com>
To: oletrucks@autox.team.net <oletrucks@autox.team.net>;
BOB_FORD@compuserve.com <BOB_FORD@compuserve.com>
Date: Saturday, March 03, 2001 9:54 AM
Subject: [oletrucks] <Tech E - Long> Using Mopar 3-spd OD trans in Task
Force truck...

>    ( Lister's Disclaimer - I'm not the originator of this article, just
>passing it along, I make no claims expressed or implied as to it's
>reliability, cost, etc. :?)     )
>    ( Article based on author's restomizing a '58 1/2-ton Apache p/u,
>utility truck )
>     I picked up the February issue of Petersen's Custom Classic Trucks
>magazine awhile back, which has a number of interesting items in it. One is
>'57 Chevy Suburban artist's concept with a Nomad/Cameo theme. Neat! The
>is a tech article on using the Mopar A-833 New Process aluminum 3-speed
>Overdrive trans ( used in '70s era Plymouth Dusters, etc ), the article
>I just got around to reading.
>    One of the biggest problems for driving an original old Chevy truck is
>the horrendous rear gear ratios which aren't meant for high-speed driving,
>and changing out the gears is an expensive and involved job if no one in
>area is capable of it. So, what to do? The old OD trannys would be nice,
>parts are hard to find, and expensive. So what's left? By utilizing this
>tranny from a Mopar, you get the OD you need (  .73 Final Drive ratio ),
> a more modern tranmission, and it's almost a BOLT-IN. Here's the good
>    1) Fairly easy to still find
>    2) Uses Chevy bolt pattern to bolt to original Chevy bell housing
>    3) Uses Chevy 23-spline driveshaft yoke ( original's were 18 )
>    4) Transmission is exactly the same length as original 3-speeds from
>'50's/early '60s, no need to replace driveshaft
>    5) Aluminum casing, lighter weight ( there are cast iron A-833's, which
>are 4-spd but aren't OD, and are more common than aluminum types, but DON'T
>USE )
>    6) used behind Mopar small blocks as well as slant six, so can handle
>smaller v-8's as well.
>    7) Has built-in back-up light switch
>Ok, that was easy enough...any bad points? well, it's never TOO easy...lol!
>Here's the other stuff :
>    1) need to have front bearing retainer turned down on lathe to fit ( or
>buy a replacement, P/N 452696 )
>    2) Speedometer will need to be recalibrated, it was designed to run off
>the rear axle ratio, even when going thru the transmission, so the OD will
>affect the reading. They suggested using a Dakota Digital instrument
>to replace the original cluster - read, more money
>    3) Have to use a floor shifter, so gotta cut that hole in the floor!
>Luckily, it appears to all be in the trans floor plate, so it won't mess up
>your main cab floor anyway.
>    So, that's about it. The author figured his engine would be turning
>3,100 rpm with the original truck axle ratio, with the Mopar OD trans, it
>would turn 2,670 in OD. He swapped his axle ratio for a 3.90 : 1, though.
>Even keeping the 4.11, a 430 rpm savings is a big deal, allowing you to
>cruise on the highway easier at 60, than winding it out at 50. I'll
>be looking to find one of these myself, for a future conversion project,
>although I have an automatic in my '55 TF Suburban at the moment.
>    As I mentioned, at the top, I have no direct experience or knowledge
>about this conversion, so talk to a tranmission shop about these OD units
>before attempting it. I intend to talk to my Trans guy, he's a real winner
>who knows alot about gear-boxes, has raced cars as well, so he should know
>about these Mopar units, and how well they'll stand up to a daily-driver
>I already have two original OD units, one a rebuilt  '57, the other a '58
>which needs alot of work and is missing the expensive solenoid, so this
>be a better way to go with a modern unit. well, time to hit the road, and
>busy. Everyone have a good weekend.
>Jerry Casper
>Woodbridge, VA
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959

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