T85C-1A Wiring
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T85C-1A Wiring
I have a 390 with a T85C-1A out of a 68 F100 sitting in my 48 F1. The tranny seems OK so far but the solenoid wires on the tail shaft are not hooked up. A couple questions about this tranny, one is if I can wire the OD solenoid to a on/off switch for highway use and the other is what the other solenoid further forward on the passenger side does? Any input is surely welcome. Thanks
Logistics Pro
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From: tujunga, calif
Yes it can be done with a toggle switch assuming you truck is 12V, I have two set up that way. Driving will require a different method then if you had all the stock relay, kick down, governor etc. Be sure to have the cable setup to lock it in conventional drive or shift to overdrive. The part on the passenger side is the governor, that doesn't need to be hooked up if you just use a toggle switch..
Logistics Pro
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From: tujunga, calif
You will need to hook up that cable. When the handle is pulled out it locks the trans in conventional drive, thats what you need for around town driving and in my case mountains roads, or you could find yourself in a free wheeling mode and being 100% dependent on just brakes. If it was to go into free wheeling it's just like having the trans in neutral. Also when the handle is pushed in to put it in the OD mode you won't be able to shift into reverse. You can push the handle in at any time to engage the OD but you can only pull it out to lock conventional drive when the truck is at a complete stop, NEVER try it when its rolling..
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More great info. Thanks. I lied to you. I got up under there this morning and traced the overdrive cable and sure enough it is hooked up to a lever. When pulled out the lever moves forward and pushed in it moves rear ward. I'm wondering if if this transmission will work after all. So since I got this truck the overdrive has been engaged. It seem a bit high geared when I moved it in and out of the shop. Would you happen to know what the OD 3 gear end ratio is? And it does have the R11 tail shaft housing. I think I'm gonna keep this transmission. What role does the solenoid play in this mix or could it be left out of the equation under these condition. Cool stuff. I think the fun part is learning about all of these things. Thanks again.
Logistics Pro
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From: tujunga, calif
Have no idea what rear end ratio would be, could be almost anything after all these years.. Even with the OD handle pushed in it won't be in OD until the solenoid is energized. If you drive it with the handle in and the solenoid not energized it will go into freewheeling when you let off the gas and will coast like it is in neutral...
The R11 is a really good unit. I have both, a R11 in my Ranchero and R10 in my Panel.
The R11 is a really good unit. I have both, a R11 in my Ranchero and R10 in my Panel.
Ford Parts Specialist
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From: Simi Valley, CA
The 1965 F100 (that I owned for 44 years) had T-85 Warner O/D, and this is what the owners manual said to do.
Besides the T-85 in the F100, the same trans was also used in 1955/56 Packards (which I've owned 20 of), the same SOP is used.
Pics: Left lower (1965 F100) similar to 1966/71 F100 O/D.
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Logistics Pro
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From: tujunga, calif
Bill, he is not going to be using the kick down switch, relay and governor so to be on the safe side I recommended he not try to pull it out when moving at speed..
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From: Coal country
I suggest you check out this website. Although it deals with GM Suburbans, he has a great deal of information on the T-85 overdrive transmissions.
Early Suburban Owners Club How-To Page
Early Suburban Owners Club How-To Page
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Thanks for all the great feed back. A couple more questions, the two wires on the solenoid does it matter which one is positive or negative, and do you engage the solenoid first then push the cable in or the other way? Thanks again for your replies. The diagrams where great along with the link to the suburban trans overhaul.
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From: tujunga, calif
Using a single switch for the solenoid you only connect one wire, the solenoid is already grounded to the trans. Take a hot wire and touch it to each wire, only one will engage it, you will hear it click, thats the one to use.
You push the handle in first, then flip the switch but it won't shift into OD until you let off the gas momentarily..
You can down shift from OD to a conventional gear the same way, flip the switch to disengage the OD and let off the gas momentarily. I only do that for a short period if I get bogged down climbing a hill or stuck behind a slower vehicle and need to pass. This will also put you into free wheeling which I don't like and shift back into OD as soon as possible..
You push the handle in first, then flip the switch but it won't shift into OD until you let off the gas momentarily..
You can down shift from OD to a conventional gear the same way, flip the switch to disengage the OD and let off the gas momentarily. I only do that for a short period if I get bogged down climbing a hill or stuck behind a slower vehicle and need to pass. This will also put you into free wheeling which I don't like and shift back into OD as soon as possible..
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