overdrive - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1969 modified · 08-22-2005, 04:15 PM

I bought a 1965 chevy inline six truck to add to my stable. It gets along with my 69. The guy I bought it off of had installed a early sixties 3 speed standard tranny with a manual overdrive, but the overdrive linkage was never hooked up. I have put a manual cable on the overdrive and have switched it back and forth going down the road, but I do not notice any rpm change. The only thing I notice is the tranny "free wheels" when you let off of the throttle when it is in overdrive. If its not in overdrive then you can hear the load on the motor when you let off of the throttle. I do not have the electric solonoid hooked up on it yet. Does anyone have knowledge of how these overdrives are supposed to be hooked up or react. You would think that you would hear a rpm change.

Thanks

farside847 · 08-22-2005, 04:27 PM

From what little I understand of these trannys - the manual cable engages the flywheel and the solinoid kickes it into overdrive. I have been looking for info on these too so if you find out more - let us know!

Lobo'74 · 08-23-2005, 12:39 AM

Try this site:
http://www.classictruckshop.com/club...over/drive.htm

llegos · 08-23-2005, 01:31 AM

can i get that overdrive unit to bolt to my truck? that sounds relly interesting, and is cheaper than a modern unit....i would only need it for freeway usage, and then i would also not need to regear my rear axle...

anyone know where i can find one and if it will bolt up to an NP435

**pjmoreland** · 08-23-2005, 09:40 AM

Sounds like you need to wire up an electrical switch to provide 12 volts to the solenoid on the overdrive unit.

1969 modified · 08-23-2005, 10:51 AM

Thanks for the help guys. I will go to the web site provided and see if I can find out the ins and outs of the T-85N overdrive tranny. For starters I guess I better see if I can find a ID plate on the tranny to see what it really is and what year. Does anyone know how to identify this tranny? If there is any T-85N guru's out there, let me know.

Thanks

*FormerMember* · 08-23-2005, 10:58 AM

let me know if there's any interest in these.

I have four of them. One hooked to a Dana 20 4x4 t-case. Still located at my buddy's house in Cameron Park, CA.

farside847 · 08-23-2005, 11:17 AM

Quote:

Originally Posted by grendel

let me know if there's any interest in these. I have four of them.

Yes! What condition are the T85's in? Do you rebuild these things? I would
be interested in one.

*FormerMember* · 08-23-2005, 11:26 AM

Quote:

Originally Posted by farside847

Yes! What condition are the T85's in? Do you rebuild these things? I would
be interested in one.

I have two that are in great shape. I bought them off of ebay about five years ago, without pictures. Was sold as "4 Jeep Overdrives". When I got them, I was a wee bit shocked, as I was expecting Warn overdrives.

Apparently these were also an option in the Willy's Wagons and pick ups.

If I were to run one of these, (which I can't due to BBC) I'd replace bearings and seals and go. They're not tough to assemble/dissasemble and all the bearings are common at any bearing store worth it's salt. The planetaries are solid and the housing is complete with all the switches.

I don't want to thread highjack anymore than I have. Throw me a PM if interested.

jamal · 08-24-2005, 12:04 AM

Quote:

Originally Posted by farside847

Yes! What condition are the T85's in? Do you rebuild these things? I would
be interested in one.

same here

llegos · 08-23-2005, 12:19 PM

if they bolt up to a my NP 4sp, i would be very interested , especially if it was a decent price...

*FormerMember* · 08-23-2005, 12:30 PM

I've seen them hooked to an SM420 and a SM465.

farside847 · 08-23-2005, 12:54 PM

What is a stock manual 3 speed called? I have a 3 on the tree.

llegos · 08-23-2005, 01:26 PM

i have a NP435, so if it is found that it can hook up to this, i would def be interested. also, how much would you want for one in good condition?

llegos · 08-23-2005, 10:20 PM

any takers on the NP bolting to this?

71RestoRod · 08-23-2005, 10:50 PM

I had one of those in a '49 Willys truck. Yup... all you need to do is pull the freewheel cable and put 12 volts to the solenoid. Mine also had a momentary disconnect switch under the gas pedal so that when you floored it, it would kick out of overdrive and act like a passing gear!

08-22-2005, 04:15 PM	#1
1969 modified Registered User Join Date: Aug 2004 Posts: 38	overdrive I bought a 1965 chevy inline six truck to add to my stable. It gets along with my 69. The guy I bought it off of had installed a early sixties 3 speed standard tranny with a manual overdrive, but the overdrive linkage was never hooked up. I have put a manual cable on the overdrive and have switched it back and forth going down the road, but I do not notice any rpm change. The only thing I notice is the tranny "free wheels" when you let off of the throttle when it is in overdrive. If its not in overdrive then you can hear the load on the motor when you let off of the throttle. I do not have the electric solonoid hooked up on it yet. Does anyone have knowledge of how these overdrives are supposed to be hooked up or react. You would think that you would hear a rpm change. Thanks

08-22-2005, 04:27 PM	#2
farside847 Registered User Join Date: Feb 2005 Location: Bay Area, California Posts: 995	From what little I understand of these trannys - the manual cable engages the flywheel and the solinoid kickes it into overdrive. I have been looking for info on these too so if you find out more - let us know! __________________ 1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree

08-23-2005, 12:39 AM	#3
Lobo'74 Registered User Join Date: Nov 2002 Location: Charlottesville, VA Posts: 404	Try this site: http://www.classictruckshop.com/club...over/drive.htm __________________ "Truck" '67 small window '79 350 .030 over, LT1 "clone"

08-23-2005, 01:31 AM	#4
llegos Registered User Join Date: Aug 2005 Location: pleasanton, CA Posts: 570	can i get that overdrive unit to bolt to my truck? that sounds relly interesting, and is cheaper than a modern unit....i would only need it for freeway usage, and then i would also not need to regear my rear axle... anyone know where i can find one and if it will bolt up to an NP435 __________________ -Steve

08-23-2005, 10:58 AM	#7
FormerMember Account Suspended Join Date: Feb 2004 Posts: 3,051	let me know if there's any interest in these. I have four of them. One hooked to a Dana 20 4x4 t-case. Still located at my buddy's house in Cameron Park, CA. Last edited by FormerMember; 08-23-2005 at 10:58 AM.

08-23-2005, 09:40 AM	#5
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,366	Sounds like you need to wire up an electrical switch to provide 12 volts to the solenoid on the overdrive unit.

08-23-2005, 10:51 AM	#6
1969 modified Registered User Join Date: Aug 2004 Posts: 38	Thanks for the help guys. I will go to the web site provided and see if I can find out the ins and outs of the T-85N overdrive tranny. For starters I guess I better see if I can find a ID plate on the tranny to see what it really is and what year. Does anyone know how to identify this tranny? If there is any T-85N guru's out there, let me know. Thanks

08-23-2005, 12:19 PM	#11
llegos Registered User Join Date: Aug 2005 Location: pleasanton, CA Posts: 570	if they bolt up to a my NP 4sp, i would be very interested , especially if it was a decent price... __________________ -Steve

08-23-2005, 12:30 PM	#12
FormerMember Account Suspended Join Date: Feb 2004 Posts: 3,051	I've seen them hooked to an SM420 and a SM465.

08-23-2005, 12:54 PM	#13
farside847 Registered User Join Date: Feb 2005 Location: Bay Area, California Posts: 995	What is a stock manual 3 speed called? I have a 3 on the tree. __________________ 1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree

08-23-2005, 01:26 PM	#14
llegos Registered User Join Date: Aug 2005 Location: pleasanton, CA Posts: 570	i have a NP435, so if it is found that it can hook up to this, i would def be interested. also, how much would you want for one in good condition? __________________ -Steve

08-23-2005, 10:20 PM	#15
llegos Registered User Join Date: Aug 2005 Location: pleasanton, CA Posts: 570	any takers on the NP bolting to this? __________________ -Steve

08-23-2005, 10:50 PM	#16
71RestoRod Registered User Join Date: Sep 2003 Location: Evergreen, CO Posts: 494	I had one of those in a '49 Willys truck. Yup... all you need to do is pull the freewheel cable and put 12 volts to the solenoid. Mine also had a momentary disconnect switch under the gas pedal so that when you floored it, it would kick out of overdrive and act like a passing gear! __________________ 71 Blazer / GMPP ZZ383 / MPFI / 700R4 / 4-Wheel Disk / Ground-up frame off almost completed resto-mod



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