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Grilles for 1934, 35, and 36 GM trucks


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#68320 - Tue Nov 07 2006 09:01 PM T85N Borg Warner Manual 3 speed Overdrive Transmission
50Tiger Offline
Junior Member
Registered: Mon Nov 06 2006 12:00 PM
Posts: 8
Loc: Kite, Georgia
Hello/Greetings to all the truck guru's out there

I need information on the old 55-63 chevy Borg Warner electric overdrive transmissions(T85N)! They are great swaps because they are the exact length of the stock transmissions in the trucks of those years. I have run across several at swap meets, but have not bought one because I can't find anyplace that has parts for them, nor can I find anyone to work on them! HELP!
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#68321 - Tue Nov 07 2006 09:27 PM Re: T85N Borg Warner Manual 3 speed Overdrive Transmission
Oly Offline
Extreme Gabster
Registered: Thu Mar 15 2001 12:00 PM
Posts: 2859
Loc: Camas Valley, Oregon, USA
Everything you might want is probably here- Borg-Warner T85N
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1945 GMC COE Victory Truck
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#68322 - Thu Nov 09 2006 10:31 PM Re: T85N Borg Warner Manual 3 speed Overdrive Transmission
rfs56trk Offline
Shop Shark
Registered: Sat Apr 16 2005 12:00 PM
Posts: 1460
Loc: Seal Beach, CA
My recommendation is to get one and everything will take care of itself. These OD units are the best kept secret for the older trucks. I have built and installed dozens of them over the last 30 years. Parts are still available you just have to root them out. I just set one up this week using electrical components available from Napa.
Fred
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#68323 - Fri Nov 10 2006 04:07 PM Re: T85N Borg Warner Manual 3 speed Overdrive Transmission
Geargeek Offline
Junior Member
Registered: Mon Sep 25 2006 12:00 PM
Posts: 37
Loc: San Bernardino,Ca
This is my first post,I just purchased a 3 speed overdrive trans with a four prong carb switch, overdrive cable (it says it on the handle) minus the wiring harness and carb bracket for 300.00 U.S. dollars I intend on installing it on my 57 3100 chevy truck which has the original 235 with 3 on the tree. What needs to be done ?? will I have to shorten the drive shaft or how does it get current for the selinoid to work ?? Im totally clueless. I live in Southern Cal if there are any fellow stovebolters out here that can help me with the install i will galdly compensate them for their time. Thanks again for all the knowledge, I love this site , Ed
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#68324 - Fri Nov 10 2006 10:56 PM Re: T85N Borg Warner Manual 3 speed Overdrive Transmission
50Tiger Offline
Junior Member
Registered: Mon Nov 06 2006 12:00 PM
Posts: 8
Loc: Kite, Georgia
Ed,

If you have a T85N, it is the identical length as your original trans. No driveshaft problems. I can usually swap them in and out in less than an hour. The large post on the solenoid is your power, and the small one is the ground that runs over to the governor. It is supposed to ground the curcuit at about 27mph. I ground the governor because I only run the overdive on the highway and interstate, and that's where I spend most of my time. I don't use a harness, just a toggle switch. I have 35 inch tires on my 57 chevy and a 3.90 rear gear. I can run about 70mph at 1500rpm. I can almost afford to drive it now!!! Well at least I could before the planetary set came apart!! Thats why I was asking for help locating parts to fix it. It actually took round planetary gears a made them straight!! Bad transmission!! If I can figure the picture thing out, I'll show pics.

Oly has listed a great site about wiring and rebuilding the trans! Thanks!

I hope rfs56trk can come up with actuall shops that can get me some parts to fix this thing. I guess the other way to go is buy another one for parts, but my luck will have the planetary gears bad in it too!
Thanks for the info so far, guys!!
Brad
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#68325 - Fri Nov 10 2006 11:24 PM Re: T85N Borg Warner Manual 3 speed Overdrive Transmission
LONGBOX55 Offline
Master Gabster
Registered: Mon May 08 2006 12:00 PM
Posts: 9055
Loc: DANVILLE IL
Welcome Ed. I got your E-mail on this tranny. The one in my truck was retro fitted, not factory. I beleive what you have is the SM318 w/the borg-Warner overdrive. This trans is a direct bolt in. I'd suggest that you use a premade wire harness to save the wireing headaches. The harness is being reproduced for the v8 models, but it will work fine with the 6. I also added a separate switch to shut the power off to it when not in use to save stress/wear on the electricals. I really can't give a feul milege for mine, as the engine isn't stock and my milege isn't real good to begin with. I can tell you that the o/d is a real joy on the open roads. I cruise at 75mph easily only turning about 1900 rpm. That's with a 30" tire and 3.90 rear gears. Some of the parts are hard to come by, but most of the primary trans parts are the same as the standard 3 speed. here is a link to the '55 manual showing how it hooks up. http://chevy.tocmp.com/1955truck2shop/55ctsm0715.htm
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Bill Burmeister
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#68326 - Sat Nov 11 2006 12:12 AM Re: T85N Borg Warner Manual 3 speed Overdrive Transmission
Geargeek Offline
Junior Member
Registered: Mon Sep 25 2006 12:00 PM
Posts: 37
Loc: San Bernardino,Ca
Longbox55 and 50tiger sorry for the late respones and thanks for all the info the more I read here the more I learn. I feel good about the buy and look forward to keeping all informed on my progress , hopefully I;ll learn how to post some pics to illistrate everything ,Thanks again guys, Ed
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#68327 - Mon Nov 13 2006 12:20 AM Re: T85N Borg Warner Manual 3 speed Overdrive Transmission
chevman32 Offline
Shop Shark
Registered: Sat Mar 12 2005 12:00 PM
Posts: 1994
Loc: Sanger, Ca.
I put an o'd trans in a 1954 Chevy pickup, it was fantastic! It would cruise at 75 M.P.H. at 2000 R.P.M. the stock 235 never even strained. I installed it with one wire from a switch to the solenoid. It would go into o'd at a dead stop and worked smoothly. The trans was a direct bolt in, absolutely no problems, total installation time including wiring was 1 1/2 hrs. Do it, you will love it for sure.
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#68328 - Mon Nov 13 2006 10:36 AM Re: T85N Borg Warner Manual 3 speed Overdrive Transmission
Truckasaurus Offline
Wrench Fetcher
Registered: Fri Oct 07 2005 12:00 PM
Posts: 148
Loc: Vallejo CA
Does any one know if those overdrive units will bolt up to a Saginaw 4 speed?
I talked to a guy that has a unit from a late 60's truck on a Saginaw 3 speed, any reason it wouldn't fit on the 4 speed as well?
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#68329 - Mon Nov 13 2006 11:04 AM Re: T85N Borg Warner Manual 3 speed Overdrive Transmission
Cosmo Offline
ODSS President
Registered: Sat Jan 20 2001 12:00 PM
Posts: 2003
Loc: C'ville,VA,USA,Earth
Truckasaurus, two different animals, the earlier type is the Borg-Warner, the later type, the all-synchro Saginaw. People HAVE made a 4- speed overdrive from a Saginaw that I know of, don't know of anyone doing it from a Borg-Warner.... requires drilling an accurate hole in the 4-speed main case. It can be done. Search Inliners.org, or someone here might have done it.

Oh, and NO, a B-W tail shaft that includes the overdrive will not bolt up to a 3 or 4 speed Saginaw front main case, two slightly different animals with different bolt spacings.
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