who has a 3spd manual (SAGINAW) with overdrive ?

[19673ontree]

I am in the process of trying to get hold of one , A friend of mine has a good one and was going to use it in his car but he got a muncie 4spd insted so he is probably gonna let me have the saginaw 3spd overdrive now ,
anyway who has one and how much did it help ?
problem is my 67 has either a .373 or .410 ratio rear gear and it run's it to death out on the highway , it fine for around town but when I go down to TN it's too low , thank's ,,,,,

[special-K]

You`ll love it.It`s member botie that just did one.I think that`s his whole name.He`s in the Chesapeake,VA area.He has all the info you need.

[Boog]

Exactly. That's the one I was thinking of. These are fairly uncommon apparently. Works good with the 6 cyl.

[BluTrukker]

I have one, and it seems to be very reliable. However, my OD does not work. It has some electrical issues. Parts for the OD seem to be a little scarce, but other than that I would roll it. Especially if it all works.

[Uwe Blab]

Yeah, Botietruck is your guy. Here's a couple of threads he's started.

http://67-72chevytrucks.com/vboard/s...d.php?t=341968

http://67-72chevytrucks.com/vboard/s...87#post3305087

I just bought a non-synchro o/d unit out of a '55 Chevy truck. I'll need to do some modifications...all of which I don't even know yet, but I'm excited to get it hooked up.

If yours is a fully synchronized version, it's definitely worth something.

[19673ontree]

let me say this first , MY TRUCK HAS THE 250 SIX CYLINDER ,
I HAVE NEVER HAD ONE OF THESE TRANSMISSIONS ,
HERE IS THE WAY THIS ONE IS SET UP

#1 it has a lever operated with a cable (LIKE A CHOKE CABLE)
#2 it has a vaccum can on it with a hose you hook up to your intake vaccum
#3 it has a PAW ? operated by vaccum that will let it go in overdrive ,
so you will push in the clutch , let off the gas , then pull the cable ?

that is how it look's to me , it look's like it is a sincro trans but I am not sure ,
1st gear may not be sincronized and thats ok , I want to use it whether it is a full sincro or not ,,, can't wait to try it ,

also it look's like and I think it will be a direct bolt in , I don't know of any modification's that will have to be made , I think the driveshaft will even fit ,,

BUT AGAIN I HAVE NOT HAD ONE !!!!!!!!

[PanelDeland]

here's a link to how "botietruck"'s worked out with links in the thread to info.
http://www.67-72chevytrucks.com/vboa...d.php?t=341968

[CG]

I have one, but I have no idea if the OD part works. After doing some research and asking around I wouldnt sell it for less than 350 bucks like it sits. So you are getting a smoking deal at free =)

[19673ontree]

it look's like I MAY GET A GOOD DEAL on it , but the fact remain's that I don't have it yet

[Uwe Blab]

19673ontree,

As for operating the o/d, my understanding it's an automatic function based on a cut-in speed, usually around 28-30 mph. The cable you mention (that looks like a choke cable) is actually the lockout mechanism and prevents the overdrive from engaging when pulled out from the dash.

Here's a pic from ebay of a stock setup...

[Botietruck]

I've never seen one that is vacuum controlled. Not saying there not out there, but evertthing I've read and seen have an electric solenoid and a governor switch. If you can post a few pics of the one you are looking to get, that would be great. I would love to see it and the vacuum controls.

The Saginaws with the o/d are a direct bolt in, no need to modify/change the driveshaft. The trans linkage is the same.
BTW, it will stay engaged in all 3 gears. If you drive with the lever pushed in (engaged) it will be similar to a 4 speed. One fellow told me he never disengages his o/d. One thing you must remember, If you leave it engaged all the time, when you shut the engine off and the trans. is in a forward gear, the trans. is in the freewheel mode and the truck will roll. You will either put in in reverse or set the parking brake. I found that out when I pulled up to the gas pump, shut the engine off, o/d engaged,and got out of the truck. I turned to get the gas nozzle and it started rolling away. I was able to get inside and set the parking brake. Now I just put it in reverse, no matter where I am or whether or not the o/d is engaged.

It is fun to drive and the rpms drop quite a bit when it shifts into o/d.
Shoot me a pm if you have other questions, if I don't have the answer, I have alot of good reading on these things. We should be able to come up with something.
Bob

[19673ontree]

I will post pic's if and when I get the trans , I really can't comment much on what it doe's or doe's not have , I have never had one so I am just a bit new on them myself