The Ford Barn

Gumpy · 05-07-2010, 10:00 AM

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

19Fordy · 05-07-2010, 10:45 AM

http://www.hotrodworks.com/ if you have a few dollars to spend.

DICK SPADARO · 05-07-2010, 11:07 AM

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.

Mac VP · 05-07-2010, 11:23 AM

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.

www.flatheadv8.com

George/Maine · 05-07-2010, 02:44 PM

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.

Gumpy · 07-13-2011, 09:00 AM

Sponsored Links (Register now to hide all advertisements)

found a 78 number transmission from a pick up---3 speed on the floor!!

Scott De Shields · 07-13-2011, 09:24 AM

You might want to look for a later 3 speed that is fully synchronized and modified with a Jeep top shifter.

Barn Junk · 07-13-2011, 05:30 PM

Quote:

Originally Posted by Mac VP

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.

www.flatheadv8.com

Be careful, the open drive mainshaft from a 1951 or 1952 truck light duty 3-speed WILL NOT interchange with the gears from a 1939-1950 trans. If you use ALL the gears and mainshaft from a 1951-52 side-shift, they can be installed in a floor shift case.

roundvalley · 07-13-2011, 05:49 PM

Buy MAC VP's book and save your self alot of hassle and money. He explains it in the book.

VANPELT SALE.

Mart · 07-14-2011, 12:48 PM

If you want to go back to a stock 3 speed trans, would it be worth considering going back to a stock rearend too?

Mart.

Gumpy · 07-14-2011, 11:56 PM

found a stock rear end...rebuilt one.....going to use the 78 box for 3 peed on the floor

Barlea · 07-15-2011, 09:16 AM

3 peed on the floor? Tell them three they can't ride with you anymore! ..B.

05-07-2010, 10:00 AM	#1
Gumpy Senior Member Join Date: May 2010 Location: Sf bay area Posts: 1,464	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

05-07-2010, 10:45 AM	#2
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,950	Re: Open Drive Conversion 1940 http://www.hotrodworks.com/ if you have a few dollars to spend.

05-07-2010, 11:07 AM	#3
DICK SPADARO Senior Member Join Date: May 2010 Location: Altamont, NY Posts: 1,004	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. __________________ dickspadaro.com

05-07-2010, 11:23 AM	#4
Mac VP Senior Member Join Date: May 2010 Location: Cincinnati, OH Posts: 1,361	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. www.flatheadv8.com

05-07-2010, 02:44 PM	#5
George/Maine Senior Member Join Date: May 2010 Location: Mid coast Maine Posts: 1,878	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.

07-13-2011, 09:00 AM	#6
Gumpy Senior Member Join Date: May 2010 Location: Sf bay area Posts: 1,464	Re: Open Drive Conversion 1940 Sponsored Links (Register now to hide all advertisements) *found a 78 number transmission from a pick up---3 speed on the floor!!*

07-13-2011, 09:24 AM	#7
Scott De Shields Senior Member Join Date: Mar 2011 Location: Santa Monica CA Posts: 157	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.

07-13-2011, 05:49 PM	#9
roundvalley Senior Member Join Date: May 2010 Location: Idaho Posts: 150	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. VANPELT SALE.

07-14-2011, 12:48 PM	#10
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 8,755	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? Mart.

07-14-2011, 11:56 PM	#11
Gumpy Senior Member Join Date: May 2010 Location: Sf bay area Posts: 1,464	Re: Open Drive Conversion 1940 *found a stock rear end...rebuilt one.....going to use the 78 box for 3 peed on the floor*

07-15-2011, 09:16 AM	#12
Barlea Senior Member Join Date: May 2010 Location: West Central Alberta Posts: 441	Re: Open Drive Conversion 1940 3 peed on the floor? Tell them three they can't ride with you anymore! ..B.