I want overdrive
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Elder User
Joined: Dec 2007
Posts: 813
Likes: 6
From: Up Nort Minnesota
I want overdrive
i've got a 77 f150 4x4 with a bone stock 351 & a C6. NP205.
3.50 gears.
I want to pull lower RPM's at hwy speeds without comprimising my low end.
what's the best way to do this? is there a way?
3.50 gears.
I want to pull lower RPM's at hwy speeds without comprimising my low end.
what's the best way to do this? is there a way?
Senior User
Joined: Dec 2008
Posts: 156
Likes: 0
From: Marshfield, MO
I only know of two ways to do it, 1. Buy a gearvendors unit, this is very expensive although someone on here claimed to be able to get rebuild units for half price but he never came back with a link. 2. use a newer computer controlled overdrive transmission, I'm not sure which one would work for your application.
Mountain Pass
Joined: Jun 2005
Posts: 237
Likes: 1
off the top of my head and I am not sure on the drive shaft as I am not sure of the length but any AOD trans should bolt right up and work doesn't have to be computer controlled the only challenge will the kick down linkage and and gear selector if you have a column shift
edit: I missed the part about keeping the NP205 I am going to say it will still work just not sure off the top of my head
edit: I missed the part about keeping the NP205 I am going to say it will still work just not sure off the top of my head
Elder User
Joined: Jan 2007
Posts: 746
Likes: 1
From: Minnesota
Since the M is a big block 351 similar to the cleveland, and I am pretty sure the AOD was only offered on small blocks such as the windsor, this won't work. You need to get a company such as Lentech to custom build you an A0D or and E40D tranny, or buy a gear vendors from the research I have done. Either way, start recycling your beer cans cause its gonna cost some cash.
Tuned
Joined: May 2008
Posts: 334
Likes: 41
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Elder User
Joined: Jan 2009
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From: Western N.C.
Did Ford ever make a lock-up C6?
My old D***e van had a lock-up torque converter that seemed to drop the RPMs a bit at highway speed...I just put a switch in the dash that let me turn the lockup on/off. Worked well and made a noticeable difference in my mileage.
I suppose you could do something similar if there is such a thing as a lock-up C6. Not sure how much of a difference it would make for you, though. Might be nice to have in 4WD. I have 3.00 gears and my 360 C6 seems to be loping at 55.
My old D***e van had a lock-up torque converter that seemed to drop the RPMs a bit at highway speed...I just put a switch in the dash that let me turn the lockup on/off. Worked well and made a noticeable difference in my mileage.
I suppose you could do something similar if there is such a thing as a lock-up C6. Not sure how much of a difference it would make for you, though. Might be nice to have in 4WD. I have 3.00 gears and my 360 C6 seems to be loping at 55.
Posting Guru
Joined: Jan 2009
Posts: 1,145
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Since the M is a big block 351 similar to the cleveland, and I am pretty sure the AOD was only offered on small blocks such as the windsor, this won't work. You need to get a company such as Lentech to custom build you an A0D or and E40D tranny, or buy a gear vendors from the research I have done. Either way, start recycling your beer cans cause its gonna cost some cash.