Tranny conversion
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New User
Joined: Apr 2003
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Tranny conversion
I am very new to the truck community (including the mechanics of trucks) so please be patient. I have a stock '86 Ford Bronco(full size) and I want better gas milage out of it. It has a 351w with I think a 3 speed automatic (don't know the type). I want to get an overdrive tranny or an aftermarket kit but I don't know anything about this. What kind of overdrive should I get, what do I need to do (generally) to complete the job, and what not. Any other sujestions on improving gas milage would be appretiated.
Junior User
Joined: Feb 2003
Posts: 60
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From: Raleigh, NC
Tranny conversion
What is your current gas milage?
Your Bronco is around 5600 lbs. and has the aerodynamics of a brick wall. If you are getting anything over 12 mpg right now you are probably doing better than most.
I don't mean to sound negative, I just don't think it's realistic to try to get decent gas milage from a big Bronco.
Your Bronco is around 5600 lbs. and has the aerodynamics of a brick wall. If you are getting anything over 12 mpg right now you are probably doing better than most.
I don't mean to sound negative, I just don't think it's realistic to try to get decent gas milage from a big Bronco.
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New User
Joined: Apr 2003
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Tranny conversion
I am getting about 10mpg right now. I understand that it seems stupid to try and make a truck gas efficient, but I am going to college and have very little left over money to pay for a lot of gas. I enjoy my truck and I would rather keep it than get something like a Ranger and this is why I am trying to do this.
Hotshot
Joined: Jul 2002
Posts: 14,285
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From: Bend,OR
Tranny conversion
I say take the cash it would cost to upgrade your tranny with an overdrive or swaping it. and just buy a geo metro or somthing to drive during the week. because putting an extra gear in a C6 tranny which is what you have will cost 1000+ easy. and a rebuilt AOD tranny that isnt as strong will cost around 800. Im sure you could find and ok car for that amount of cash.
later
later
New User
Joined: Apr 2003
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Tranny conversion
Hey mbd2-
Stick with the C-6. It is the strongest tranny you can have on the Bronco, and the cheapest to fix or replace.
Especially if you are on a college budget, leave it alone.
I had a 92 4x4 F150, burned up the EOD4, and spent $1,800 replacing it. A rebuilt C-6 costs around $400, and won't tear up to start with.
That extra $1,400 would have bought a lot of gas....
Stick with the C-6. It is the strongest tranny you can have on the Bronco, and the cheapest to fix or replace.
Especially if you are on a college budget, leave it alone.
I had a 92 4x4 F150, burned up the EOD4, and spent $1,800 replacing it. A rebuilt C-6 costs around $400, and won't tear up to start with.
That extra $1,400 would have bought a lot of gas....
Senior User
Joined: Nov 2002
Posts: 149
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From: Saint Charles, MO USA an
Tranny conversion
You can try to find an AOD at a junkyard, around here I have found quite a few its the C6'S that are hard to come by. You can pick one up below $250 and swap it out yourself. I also read an article, I think here, about modifying a C6 for overdrive. Also alot of engine modications claim to add gas mialage. Or I guess you can just try to lay off the gas pedal.
