Re: F150 tranny with overdrive With more than 56,000 views on this thread alone, and 241 replies, do you think Henry missed the boat on not having an overdrive? :D
I've always said the three main things lacking on the Model A are a higher compression head, counterweighted crankshaft, and overdrive. More leg room would be next on the list.:) |
Re: F150 tranny with overdrive One needs to be aware that there are three overdrive ratios available with the F150 transmission. Unaware of that fact, I discovered too late that I had installed the highest ratio of 42% (I think that 35% is recommended for Model A's)
Fortunately, with an improved motor and lightweight body it pulls this ratio effortlessly up hill and down dale. I haven't checked what diff ratio I have but presumed it to be standard, but as it was out of a speedway midget it may indeed be lower than normal. To complicate the issue I have a vintage quick change diff with a slightly higher ratio. All I know is that at 100kph (62mph) it is pulling 1670 rpm. The installation uses a MAC's bell housing and requires a Mustang turbo clutch. Keith |
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Duplication of post #8 which has lost it's photos: To answer your question, the transmission you are looking for is out of an 84-87 Ford F150 2WD pickup with an inline 6 or small V8. It has a floor mounted shifter and the shift knob will have "OD" where the normal "4" would be in a normal "H" pattern 4 speed. Secondly, look at the left side of the transmission case. There should be a casting number "260XXXX". Third, on the right side of the transmission there should be a riveted metal tag with the first three letters "RTS" followed by two letters which will identify the OD ratio. See my chart below of the decoding.
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Missed a photo for post #245:
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Re: F150 tranny with overdrive Few other items we found, hopefully covered in prior posts:
Tranny is heavier than stock model A; Plate can be made to support tranny on cross member with Float a motors; Some frame spreaders may not clear the F150 tranny when using stock A motor mounts if/when installing engine with tranny already in car; Brake/clutch shaft may need special bracket to support shaft end and to accommodate stock A pedals; Speedo may need calibration , etc. |
Re: F150 tranny with overdrive Speedo won't need calibration with the F150 overdrive because the speedometer is driven off the drive shaft. A change in rear end ratio would require a calibration change.
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Re: F150 tranny with overdrive What machine work did you have to do to make this work for you?
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2) Comes with kit 3) With a little creative ingenuity, works ok 4) Comes with kit 5) Speedometer gear is aft of transmission, will give you the same reading in or out of OD. No need to re-calibrate. |
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However a Ford Falcon speedo cable fitted perfectly. Also, with the 42% overdrive the speedo reads 75mph when the car is doing 62mph (100kph in NZ) |
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Re: F150 tranny with overdrive I realize this is an ancient thread on the T170FT RTS. No where does anyone talk about shortening the output shaft for the torque tube adapter plate and universal. Are you all buying a kit that has the output shaft splined and cut and then re assembled back into the case? I understand that the torque tube, driveshaft, and radius arms need to be shortened. Any info appreciated on shortening the output shaft or does someone sell an already modified shaft? I have the 27% OD trans. Like to put it in my 30 Tudor.
Thanks, j |
Re: F150 tranny with overdrive I bought the complete kit with all the machine work already done. All I had to do was just bolt it in.
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Rather than have shorten the torque tube and drive shaft, would the open drive shaft kit be an option? Just asking. Speedway motors has them, Part #9191111. John |
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Thanks, John |
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Re: F150 tranny with overdrive I flip flop on doing open drive versus closed drive, Speedway sells rear end adapter for open driveline. Then wouldn't have to do any machining to output shaft but would have to do more mods on radius rods. Prefer to do TT but need more info on modifying the output shaft etc.
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The length of my OD Transmission with the AA bell housing to the retainer was 18.3125". I figured out how much to shorten the TT by subtracting the shorter original bell and trans combo from the longer OD set up.
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