Overdrive for C6
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Overdrive for C6
I have a 72 F100 with a C6. I was wondering if anyone has put an overdrive unit on and if it was worth it for the extra gas mileage. If anyone has what kind was it and how much work did it take.
Bob
Bob
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Overdrive for C6
Bob, there has been a lot of dialogue on this subject the past couple of months. Do a search on this site using terms like overdrive, gear vendor, etc.... You'll have plenty to read.
I think it is generally accepted that 460's w/C6 having rear gears of 3.55 to 4.10's get pretty much the same mileage - lousy.
I don't know what your driving habits are, nor how much driving you do with your truck, but I decided that the small mpg improvement that I could "possibly" realize didn't warrant the the additional cost of an overdrive unit.
Chris
'88 F350 XLT Lariat CC DRW/7.5l/C6/4.10
'93 Mustang LX 5.0l/T-5/3.55's/Flo's/pulleys/K&N/Synthetics
Nissan p/u (DC commuter)
Volvo 940
I think it is generally accepted that 460's w/C6 having rear gears of 3.55 to 4.10's get pretty much the same mileage - lousy.
I don't know what your driving habits are, nor how much driving you do with your truck, but I decided that the small mpg improvement that I could "possibly" realize didn't warrant the the additional cost of an overdrive unit.
Chris
'88 F350 XLT Lariat CC DRW/7.5l/C6/4.10
'93 Mustang LX 5.0l/T-5/3.55's/Flo's/pulleys/K&N/Synthetics
Nissan p/u (DC commuter)
Volvo 940
Cargo Master
Joined: Jul 2000
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From: Northern California
Overdrive for C6
The quick answer is NO. If you want to see for yourself, go to a junk yard and buy a ford 9" with tall gears and swap it in and see what happens. You'll find that if you got 10mpg you may get 12mpg now.
A gear change will do the same thing, but you'll loose some of the low end power. For most trucks that don't tow a lot, the best option is new gears or taller tires because the $3000 for an overdrive takes a LONG time to pay off. If you have a 2speed transfer case, I'd try tall gears and then use the lower range for towing if needed.
If you can find one used, it might be another story. I've seen used OD units for about 600~800.
A gear change will do the same thing, but you'll loose some of the low end power. For most trucks that don't tow a lot, the best option is new gears or taller tires because the $3000 for an overdrive takes a LONG time to pay off. If you have a 2speed transfer case, I'd try tall gears and then use the lower range for towing if needed.
If you can find one used, it might be another story. I've seen used OD units for about 600~800.
Senior User
Joined: Aug 2001
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Overdrive for C6
karljay
where have u seen the used units for that price, i was thinking about putting in the o/d unit into my truck but i am not sure it will fit, i have dual gass tanks and it looks pretty tight down there, but maybe the unit will fit in there better...
thanks
77_f250_460
where have u seen the used units for that price, i was thinking about putting in the o/d unit into my truck but i am not sure it will fit, i have dual gass tanks and it looks pretty tight down there, but maybe the unit will fit in there better...
thanks
77_f250_460
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