Overdrive kit for auto?
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Freshman User
Joined: May 2004
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From: San Diego/Santa Cruz
Overdrive kit for auto?
I have a 3 spd auto '86 F-250. I read about people putting in overdrives with manual transmissions, can I put one in mine? Would be nice to roll down the highway at lower rpms.
On the subject of transmissions, how do I know which one I have (c4,c5,c6), and what's the difference?
On the subject of transmissions, how do I know which one I have (c4,c5,c6), and what's the difference?
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Joined: Aug 2004
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Originally Posted by Teedo47
I have a 3 spd auto '86 F-250. I read about people putting in overdrives with manual transmissions, can I put one in mine? Would be nice to roll down the highway at lower rpms.
On the subject of transmissions, how do I know which one I have (c4,c5,c6), and what's the difference?
On the subject of transmissions, how do I know which one I have (c4,c5,c6), and what's the difference?
Posting Guru
Joined: Sep 2002
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From: Northeastern Pa - USA
the c-6 was put behind the diesel engines. beefed up internal parts to handle the higher torque and power. You should be able to get an overdrive from gear vendors. You will have to shorten the drive shaft. It will work on the rear wheel drive and the 4x4. try a internet search for gear vendor (s). they are located in california. I had one on my 88 and it worked very well. It allows a 22% reduction in engine speed in all gears. They shift like a standard (selectable) or set it to shift automatically.
Posting Guru
Joined: Jul 2004
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From: West Valley Utah
Reading your post, I am not sure if you mean swapping a 5 speed manual with overdrive with your existing C6 or if you are talking about adding a brownie trans.
Either one can be done. A brownie trans is a manual, 3 or 4 speed that gives you deep under, under, direct and overdrives. It mounts behind the existing trans, can be used with either manual or auto trans.
Under and overdrives by either Gear Vendor or U.S Gear work very well.
Swapping in a 5 sp. overdrive can be pretty expensive. You have to change the flywheel, bellhousing, buy the clutch, tranny and linkages whether they be hydraulic or use the old style rods. You could also swap in an E4OD auto and use aftermarket electronic box (computer) to shift the trans properly.
I have a Gear Vendor OD in an 86 F250 4x4, 4:10 gears, cummins 5.9 and C6 auto. Still needs another overdrive cuz it's wound tight at 78 mph. I don't want to loose the low end torque by changing the gear ratio because of the load I pull. 27 ft 5th wheel, 21 ft boat or the 5th wheel and trailer with 4 wheelers.
Mostly it depends on what you want to use the vehicle for and how deep your pockets are.
Either one can be done. A brownie trans is a manual, 3 or 4 speed that gives you deep under, under, direct and overdrives. It mounts behind the existing trans, can be used with either manual or auto trans.
Under and overdrives by either Gear Vendor or U.S Gear work very well.
Swapping in a 5 sp. overdrive can be pretty expensive. You have to change the flywheel, bellhousing, buy the clutch, tranny and linkages whether they be hydraulic or use the old style rods. You could also swap in an E4OD auto and use aftermarket electronic box (computer) to shift the trans properly.
I have a Gear Vendor OD in an 86 F250 4x4, 4:10 gears, cummins 5.9 and C6 auto. Still needs another overdrive cuz it's wound tight at 78 mph. I don't want to loose the low end torque by changing the gear ratio because of the load I pull. 27 ft 5th wheel, 21 ft boat or the 5th wheel and trailer with 4 wheelers.
Mostly it depends on what you want to use the vehicle for and how deep your pockets are.
