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Re: [oletrucks] the need for speed

To: "Jack Halton" <safesix@earthlink.net>,
Subject: Re: [oletrucks] the need for speed
From: "Deve Krehbiel" <deve@wwwebservice.net>
Date: Tue, 9 May 2000 17:36:36 -0500
yes, and anyone willing to part with a 4 spd OD tranny, please contact me. I
am ready for one as well!


----- Original Message -----
From: "Jack Halton" <safesix@earthlink.net>
To: "Steve Parham" <thebttmline@yahoo.com>; <oletrucks@autox.team.net>
Sent: Tuesday, May 09, 2000 2:44 PM
Subject: RE: [oletrucks] the need for speed

> I have been using overdrive transmissions for years and they have a big
advantage in that you can keep the 3.90 for torque but drop to 2.73 on the
highway when cruising with no load.
> The 5 and 6 speed trannies common today have up to .50 top gear for which
we can probably thank EPA/CAFE/OPEC so the net result is the same or better,
but these trannies are rather costly in most cases and present some problems
in adapting to old trucks.
> The Borg-Warner and Saginaw overdrives from the 50's and 60's are
relatively inexpensive, adapt pretty easily to the truck drivetrains, and
are what I call a "true" overdrive in that they use a solenoid-engaged
planetary gearset, a free wheeling clutch, speed governor to prevent damage
from engaging at too low a speed, and a kickdown for passing. The nice
little extras with these units are clutchless shifting and free wheeling.
> Downside to this type of OD is that they are pretty much swap meet items
these days and parts can be tough to find.
> www.Chevytrucks.org has a HRM '75 reprint discussing the Saginaw OD
4-speed conversion. This is what I use in my old truck and I highly
recommend it.
> ------Original Message------
> From: Steve Parham <thebttmline@yahoo.com>
> To: oletrucks@autox.team.net
> Sent: May 9, 2000 5:09:10 PM GMT
> Subject: [oletrucks] the need for speed
> Hi all!
> I've been browsing the archives and it appears
> that most folks obtain higher highway speeds by
> replacing the rear end - replacing the standard
> 3.90 gears.  This is what I've been planning to
> do also, but before I do I was also wanting to
> consider keeping the 3.90 gears and adding
> overdrive.  My transmission was replaced with an
> automatic (350) by a previous owner.
> To say I'm an amateur mechanic is probably an
> overstatement.  This truck is an education for
> me - (one which I'm thoroughly enjoying).  I was
> hoping someone could give me some of the pros and
> cons of a new rear end vs. overdrive to help me
> with this decision.
> This truck will become my daily driver.  The highway
> speed limit here is 70 mph.  I just want to be able
> to cruise comfortably at 80 so I can go with the flow.
> Thanks for your help,
> Steve
>        __
>   _____|L\___    Steve Parham
>  (_,._____,._)   55 3100 1st
> ---`'-----`'--   Knoxville, TN
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
> Jack Halton
> 51 GMC 1/2 ton
> Winter Park FL
> 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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