Where can I find an overdrive 3 speed transmission
for my 66f100 with 352? Can you put the overdrive
unit on a regular 3 speed? I can't spend much money
but I need a transmission pretty quick and want
to stick with the standard.

 

I happen to have a 3 speed overdrive tranny out of a 65 but it came from behind a straight-six. However I don't know much about it, and I'd like to as the reverse gear is 99.99% gone out of the regular 3 speed that's in my 65 daily driver now. Anything you might happen to learn, let me know, as I have an idea I'd like to try. I recently replaced my clutch, and found that they were not the same tranny with an overdrive on the rear. Anyone, any thoughts?

 

i have a 1968 f100 with 360,3 on the tree with over drive *edited*

 

Dear Diharris and 65Toy: The 3 speed OD is not a regular 3 speed transmission with an OD housing bolted on. The 3spd OD is a Warner T-85N transmission, and uses the Warner T-85 as it's basis, but the T-85N is indeed different from the T-85. Ford used Ford 3spds for their non-OD applications, and I believe (but am not sure) that the bolt pattern for the transmission to mount to the bellhousing is different.
The T-85N differed from the T-85 in that the output shaft, the idlershaft and the rear case bolt pattern drillings are all different. In other words, you cannot just bolt up an OD housing and go. It won't work. Additionally, you will require a different diveshaft length and type from the regular Ford 3 speed, as well as the proper bellhousing. Finally, if you get an OD, make sure the rear casting (the OD part) has the casting R-11. R-10 is much more common, and was used in cars rather than trucks; it tends to be a weaker transmission.
The 3spd OD of this type requires more than just the transmission: It also requires the wiring harness which includes a relay, a kickdown switch on the accelerator, and a cutout on the distributor circuit to allow the kickdown to work.

I recommend that if you want to convert to 3 speed OD, which I believe will be WELL worth the gas mileage, I recommend you search the web for Warner T-85N and overdrive for wiring diagragms to make your own; they are out there.

Details can be found in the Ford Shop Manuals, which are available on this site.

 

 

bump for informatioal purposes

 

I put an O/D trans in my f100. Took it from a 78 to 83 f150.I think they called it an SROD (single rail overdrive).meaning the shifter goes to one shift rod internaly in the trans. shift lever has a forked end that saddles the shift rod and the shifter sits about 6 inches behind the orig position.Bolted right to the 352 bellhousing but had to shorten the front shaft and use a slip yoke from a c3 trans.Hums along nice at 80 at about 2000 rpm. BTW there were two versions made one for cars and one for trucks. truck version had larger brgs. believe tremec tag it t170fs?

 

bangopicker, happen to know the trans code for the T85N? from my books it seems its code B

 

Hey guys, I have a chance to install a T85N-1A overdrive trans in my 1960 f100 223 six cylinder, I understand the problems with drive shaft length, possible bell housing holes but are their more problems I can be in store for and is it going to be worth all the trouble. Thank you for your time. Billy C.

 

Do a lot of research before you do it.

 

B it is...1961/71.

1961/71 T-85 models & case markings,

1961/64 223: AS2T-85G / case marked: 3TAK

1961/64 292: AS2T-85H / Case marked: 3TAM

1965/67 6 or V8: AS2T-85N / Case marked: 5W3C

1968/71 6 or V8: AS10T-85N / Case marked: 8W3AS

The T-85 was also used in Ford cars thru 1967 with 223/240/289/292/312/352 and 390 engines.

Looking for a T-85? Don't forget, you'll also need the transmission yoke, and correct length driveshaft for your application. And...the overdrive: relay, kickdown switch, control cable and wiring harness.

DHarris: These transmissions do not grow on trees, and are hard to find.

Parts are scarce unless one knows exactly where to look.

Besides Fords, the transmission was also used in Mercury's, Edsels, early Lincolns, Studebakers, Packards, Nashes and Hudsons. Everyone wants one, few find them.

 

I had a 76 ford van w/ 302 that had a 3 spd in it...i bolted in an 3spd w/granny gear..the floor already had a circular recess from the factory for the floorshift to come through...all I had to do was cut it out and just move the tranny support and redrilled the frame...same drive shaft...I think the 3 spd, the 3 w/ granny, 3 w/ od and the top loader 4spd are all the same bolt pattern..I know for a fact that the 3/od and the 4spd are identical...and the 3w/ granny and the 3spd are identical..uhmmm we are talking manual transmissions here right?

 

Some old post never die, even though they get stinky.



John

 

as long as there is an interest..then it should live forever...just for the guys who want to know the info and just recently stumbled upon it...

 

just about to buy a '68 F100 240 I-6 with 3 on tree...

sure would like to find an od.

Can get one out of a '52 6-cyl car in local junkyard
and i know that tranny by heart - had one in my '53 Ranchwagon when i was young.
anybody ever done that swap?

old jim