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08-04-2017, 07:59 AM | #1 |
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Join Date: Feb 2011
Location: SUNSHINE MD.
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Overdrive trans. In 51 pkp.
What trans. Will work . Will car trans. Work.? Sunshine
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08-04-2017, 08:36 AM | #2 |
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Location: Green Bay Wi
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Re: Overdrive trans. In 51 pkp.
I think so but ask the king Mac Vanpelt
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08-04-2017, 09:29 AM | #3 |
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Location: Cincinnati, OH
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Re: Overdrive trans. In 51 pkp.
The 1949-50 Mercury overdrive transmission is the easiest bolt up with the least modification needed. You will have a side cover shift (requiring a steering column shifter) and you'll have to have a new driveshaft made up due to the shorter length. They use the same u-joint slip yoke. Same clutch, same clutch release linkage, etc.
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08-04-2017, 09:40 AM | #4 |
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Re: Overdrive trans. In 51 pkp.
It's mostly about fit and clutch actuation. The 49 to very early 51 Mercury type bolts right up as Mac VP mentioned with the same 1 3/8" 10-spline input. The only easy bolt up for the narrow mount 1-inch 10-spline transmissions such as used on Ford cars & later 51 thru 53 Mercury cars is all about the bell housing and clutch use. The only bell housing that will easily let that happen is the later 1951 Mercury cast iron bell but the clutch disc for the late 51 thru 53 Mercury would have to be used with the late 51 Merc throw out bearing. These housings are getting harder to find now days since they were only used during one model year and only part of that year to boot. The equalizer shaft for the late 51 Merc bell may also have to be modified to work but I don't know for sure.
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08-04-2017, 09:52 AM | #5 |
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Join Date: Nov 2011
Location: NW Arkansas
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Re: Overdrive trans. In 51 pkp.
Put a '49 Merc OD in a '48 F1 many years ago. Bolted right up. Biggest hassles were the side shifter on the trans and drive shaft length. Also don't forget rear end ratios. If you try to use the early Ford trannies you will have a bell housing issue.
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08-04-2017, 09:58 AM | #6 |
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Re: Overdrive trans. In 51 pkp.
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08-04-2017, 10:43 AM | #7 |
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Join Date: May 2010
Location: Hansville, WA
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Re: Overdrive trans. In 51 pkp.
This is a 49 Merc O/D transmission in my 1940 Tonner. I fabricated a new bracket to support the transmission and bolted it to the existing cross member and had a new driveshaft made to fit. That was the extent of the chassis mods. It was a straight bolt in clutch and all. We modified an early Ford 4 Speed shift tower to do the actual shifting chores. As has been suggested you will need to locate a column shift to complete the modification. I suggest you also consider the use of a T5 transmission. Do a search here on the site and there will be many threads on that topic. Good luck...
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08-04-2017, 11:13 AM | #8 | |
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Location: NM
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Re: Overdrive trans. In 51 pkp.
Quote:
A '51 F-1 pickup should already be side-shift, unless it came with the HD 3-sp or the spur gear 4-sp. If the truck is an F-2 or F-3, there is a chance the OD will clear the different crossmember used on those. More info would help.
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'52 F-1, EAB flathead |
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08-04-2017, 11:19 AM | #9 |
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Join Date: Sep 2011
Location: Black Hills, SD
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Re: Overdrive trans. In 51 pkp.
Personally, I think I would go with a later transmission, like a T5 or that BW 4 speed used in some of the early 80s Ford pickups (3+O/D), or the cast iron top loader. Those early overdrives are pretty weak and certain parts are unobtainium. Anything R9 or smaller is weak and the R10 didn't come until mid 50s. The R-11 is best, later 50s until the demise of 3 speed overdrive around 1972.
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08-04-2017, 11:49 AM | #10 |
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Join Date: Nov 2011
Location: NW Arkansas
Posts: 524
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Re: Overdrive trans. In 51 pkp.
After looking at all the overdrive options available now I decided on the T5. Glad I did.
The rear cross member is going to have to be modified either way. Drive shaft was easy. The Cornhuskers' kit made it a bolt in. The early S10 transmission I used was 20% OD. Worked perfect with the original 3.78 rear end. |
08-04-2017, 01:22 PM | #11 |
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Join Date: May 2010
Location: East Shore of LAKE HOUSTON
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Re: Overdrive trans. In 51 pkp.
Since you already have an open driveshaft to start with in the pick-up, a Borg-Warner T5 is just about a "no brainer". They are compact, plenty stout to stand-up to flathead power and more, and you can't find a sweeter-shifting transmission anywhere. By carefully choosing the correct model of the MANY available T5 gear sets, you can tailor the gear ratios essentially to perfection. A really prime, yet simple choice would be a 1983-'87 Camaro V8 T5 with a 2.95 1st gear ratio, as the 2.95 is extremely close to the stock old Ford 3-speed's 1st gear ratio of 2.82. You certainly don't want to end-up with one of the 4-cylinder or 6-cylinder T5s with a 4.03 1st gear, or even a 3.76 1st gear, which is essentially useless for a street-driven vehicle. To the suggested Camaro trans above, substitute an S-10 tailshaft housing which moves the shifter about 9-1/4" farther forward, to more-nearly replicate the old Ford 3-speed shifter location. Click on the link below for complete detailed article on this simple, bolt-on swap. This trans is shown below after the simple swap. This is a sweet deal! DD
http://lugnutz65chevystepside.weebly...onversion.html A simple one piece trans adapter for Chevy to flathead is available from several sources, such as Wilcap, Speedway Motors, Offy and others. |
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