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05-07-2010, 10:00 AM | #1 |
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Open Drive Conversion 1940
Hi ---I have a 1940 coupe which came w/9" ford rear end...going to put a 1951 mercury motor and 39 trans box in.....along w/driveshaft what will i need and does someone sell the whole kit? I tried speedway and they said go to s-10 trans but want the 3 sp for originality....thankyou
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05-07-2010, 10:45 AM | #2 |
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Re: Open Drive Conversion 1940
http://www.hotrodworks.com/ if you have a few dollars to spend.
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05-07-2010, 11:07 AM | #3 |
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Re: Open Drive Conversion 1940
You will not be able to connect you closed drive line transmission to your open drive line rear end. To do this successfully you will have to use a 1942-47 pickup truck trans mission which is designed for an open drive line. Down side to this is that you will have to modify the rear transmission mount.
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05-07-2010, 11:23 AM | #4 |
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Re: Open Drive Conversion 1940
If he already has a 9" rear end, he's halfway there. Any 42-51 pickup truck 3 speed trans will give him that "39" toploader trans but equipped for the open driveshaft. Or he can buy the parts needed to convert his actual 39 gearbox to open drive (ie: mainshaft and rear bearing retainer/rear support with speedometer drive gears). He'll have to have a driveshaft made up. The front yoke is available from Coleman Racing Products in Michigan (their 1310 series). Plus a minor (?) modification to the frame center support to change from the 10" wide spacing to the 8" wide spacing of the open drive rear support.
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05-07-2010, 02:44 PM | #5 |
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Re: Open Drive Conversion 1940
I was going that route and after 2 junk trans ,I went with c4 auto.If you can find a good 3 speed truck trans,thats and easy swap.
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07-13-2011, 09:00 AM | #6 |
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Re: Open Drive Conversion 1940
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07-13-2011, 09:24 AM | #7 |
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Re: Open Drive Conversion 1940
You might want to look for a later 3 speed that is fully synchronized and modified with a Jeep top shifter.
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07-13-2011, 05:30 PM | #8 | |
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Re: Open Drive Conversion 1940
Quote:
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07-13-2011, 05:49 PM | #9 |
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Re: Open Drive Conversion 1940
Buy MAC VP's book and save your self alot of hassle and money. He explains it in the book.
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07-14-2011, 12:48 PM | #10 |
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Re: Open Drive Conversion 1940
If you want to go back to a stock 3 speed trans, would it be worth considering going back to a stock rearend too?
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07-14-2011, 11:56 PM | #11 |
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Re: Open Drive Conversion 1940
found a stock rear end...rebuilt one.....going to use the 78 box for 3 peed on the floor
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07-15-2011, 09:16 AM | #12 |
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Re: Open Drive Conversion 1940
3 peed on the floor? Tell them three they can't ride with you anymore! ..B.
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