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Old 01-09-2016, 11:07 AM   #241
Tom Wesenberg
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Default 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?

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.
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Old 01-09-2016, 03:43 PM   #242
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Default 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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Old 01-09-2016, 03:43 PM   #243
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Default Re: F150 tranny with overdrive

Quote:
Originally Posted by forever4 View Post
Tom,
What about the real "Number One"?

An electronic generator regulator.
20 years too early for the transistor, but an electro-mechanical regulator would have been just fine.
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Old 01-09-2016, 04:28 PM   #244
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Default Re: F150 tranny with overdrive

Quote:
Originally Posted by wensum View Post
...(I think that 35% is recommended for Model A's)...
Mine is 27% with the standard rear (3.58)
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Old 11-04-2016, 06:48 PM   #245
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Default Re: F150 tranny with overdrive

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.
Attached Images
File Type: jpg F150asFound03b.jpg (66.8 KB, 101 views)
File Type: jpg F150asFound04b.jpg (90.0 KB, 82 views)
File Type: jpg RTS coding chart_b.jpg (47.3 KB, 108 views)
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Old 11-04-2016, 06:50 PM   #246
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Default Re: F150 tranny with overdrive

Missed a photo for post #245:
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File Type: jpg F150asFound05b.jpg (102.4 KB, 81 views)
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Old 11-05-2016, 03:17 PM   #247
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Default 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.
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Old 11-06-2016, 04:58 AM   #248
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Default 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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Old 02-20-2017, 02:11 PM   #249
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Default Re: F150 tranny with overdrive

What machine work did you have to do to make this work for you?
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Old 02-20-2017, 03:28 PM   #250
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Default Re: F150 tranny with overdrive

Quote:
Originally Posted by whitetm View Post
What machine work did you have to do to make this work for you?
No machine required with the kit I purchased. Complete bolt in.

Quote:
Originally Posted by duke36 View Post
Few other items we found, hopefully covered in prior posts:
1) Tranny is heavier than stock model A;
2) Plate can be made to support tranny on cross member with Float a motors;
3) Some frame spreaders may not clear the F150 tranny when using stock A motor mounts if/when installing engine with tranny already in car;
4) Brake/clutch shaft may need special bracket to support shaft end and to accommodate stock A pedals;
5) Speedo may need calibration , etc.
1) True
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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Last edited by CarlG; 02-20-2017 at 03:36 PM.
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Old 02-21-2017, 02:48 PM   #251
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Default Re: F150 tranny with overdrive

Quote:
Originally Posted by harleytoprock View Post
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.
It's interesting that because the gearbox has an electronic take-off for the speedo, I was told that an expensive solution was required.
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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Old 02-21-2017, 03:55 PM   #252
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Default Re: F150 tranny with overdrive

Quote:
Originally Posted by wensum View Post
It's interesting that because the gearbox has an electronic take-off for the speedo, I was told that an expensive solution was required...
You must have a different transmission than I have (which is a Tremec RTS), mine does not have an electronic take off for the speedometer.

Quote:
... Also, with the 42% overdrive the speedo reads 75mph when the car is doing 62mph (100kph in NZ)
My transmission is 27% overdrive (4th gear). And since the speedometer take off is the original Model A gear, aft of the transmission, it has no bearing on what gear it is in as to how it reads.
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Last edited by CarlG; 02-21-2017 at 04:00 PM.
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