Has anyone put an overdrive transmission on a 390?
I have just purchased a 67 Mercury (that's a Canadian Ford ) Custom Cab. The Engine is Rebuilt to 400 hp and has a fmx transmission in it.
I don't think this will stand up and would like to put a heavier transmission in and get better mileage on highway.
Suggestions please?
I am rolling with a T85 with R11 overdrive in my 69 Bump with a 390. Old school to say the least but I love cruising with old world technology that worked. I can cruise on the highway doing 65-70 with everyone else and it turns no RPMs. With the overdrive on my ride which is a bone stock rebuild translate into 3-4 mpg on the highway if I am easy on the gas.
"If it can't be fixed with a hammer, then it is an electrical problem"
69 Ford F100 Ranger 390 3spd with overdrive
63 Chevy Impala 327 with 4spd. In the family since brand new. Over 280,00 miles
cowbay wrote:I am rolling with a T85 with R11 overdrive in my 69 Bump with a 390. Old school to say the least but I love cruising with old world technology that worked. I can cruise on the highway doing 65-70 with everyone else and it turns no RPMs. With the overdrive on my ride which is a bone stock rebuild translate into 3-4 mpg on the highway if I am easy on the gas.
3-4 mpg? My '69 F-250 T85-OD gets 17-18 mpg on mostly level terrain highways at 70mph. It's an FE 410 2bbl with RV cam, 4.08 bore x 3.98 stroke, with 3.54 Dana 60 TorqueLoc, P235-75R16LTs. Why is yours getting such poor gas mileage?
cowbay wrote:I am rolling with a T85 with R11 overdrive in my 69 Bump with a 390. Old school to say the least but I love cruising with old world technology that worked. I can cruise on the highway doing 65-70 with everyone else and it turns no RPMs. With the overdrive on my ride which is a bone stock rebuild translate into 3-4 mpg on the highway if I am easy on the gas.
3-4 mpg? My '69 F-250 T85-OD gets 17-18 mpg on mostly level terrain highways at 70mph. It's an FE 410 2bbl with RV cam, 4.08 bore x 3.98 stroke, with 3.54 Dana 60 TorqueLoc, P235-75R16LTs. Why is yours getting such poor gas mileage?
I think cowbay meant that his truck saw a 3-4 mpg increase with that drive train combination.
) Custom Cab. The Engine is Rebuilt to 400 hp and has a fmx transmission in it. 
Old school to say the least but I love cruising with old world technology that worked. I can cruise on the highway doing 65-70 with everyone else and it turns no RPMs. With the overdrive on my ride which is a bone stock rebuild translate into 3-4 mpg on the highway if I am easy on the gas. 
