351c swap
06-22-2010, 12:48 AM
#1
Thread Starter
Join Date: May 2010
Location: ca
Posts: 27
351c swap
hey everyone, i have a 351c, C6, drive shaft from a recked 72 mustang, im wanting to transfer this into my 69 mustang. i know 70 was the first year the cleveland was build, and the 69-70 are pritty close to idenical right?? would i have any issues with this swap?? driveshaft length? tranny support bracket?
has anyone on here done this swap before and if so what problem did you incounter if any? thanks
has anyone on here done this swap before and if so what problem did you incounter if any? thanks
06-22-2010, 07:49 AM
#2
2nd Gear Member
Join Date: Aug 2009
Location: Nebraska
Posts: 475
You didnt say what was in the 69 mustang for what you already have available. The C-6 has its own transmission crossmember. These are easy to find from most mustang parts places or off ebay, for about $40.
06-22-2010, 12:11 PM
#3
Thread Starter
Join Date: May 2010
Location: ca
Posts: 27
You didnt say what was in the 69 mustang for what you already have available. The C-6 has its own transmission crossmember. These are easy to find from most mustang parts places or off ebay, for about $40.
i have the entire drive line for both sets, my concern is that since its out of a 72 that all the parts wont match up completly
Last edited by mustang_garage; 06-22-2010 at 01:15 PM.
06-24-2010, 05:05 AM
#5
6th Gear Member
Join Date: May 2009
Location: PA
Posts: 5,232
sry, i have a 351w, c4 trans currently in my 69, the 351c and C6 is still in the wrecked 72 fully assembled. i have the the cross member for the C6 but its designed for the 72.. i was wondering if i would have problems with the motor mounts, driveshaft length, trans crossmember mounting issue, location? ect...
i have the entire drive line for both sets, my concern is that since its out of a 72 that all the parts wont match up completly
i have the entire drive line for both sets, my concern is that since its out of a 72 that all the parts wont match up completly
You could just use the trans you have.
I'm not sure how important the C6 crossmember is, years ago I put a 71 C6 in a 68, without the special crossmember, since I didn't know any different. Didn't seem to be a problem.
You may be able to use the driveshaft you have now. If your 69 actually has an FMX, it'll have the 31 spline yoke, that may need to be swapped
All 289/302/351W/351C used the same motor mount system.
06-24-2010, 06:00 AM
#6
6th Gear Member
Join Date: Oct 2006
Location: Cork, Ireland
Posts: 6,417
we recently swapped a FMX for a C6 in a Mercury 400M (late70s). the crossmember actually fit (i was well surprised), but we had to shorten the driveshaft by a couple of inches but spline count was 31 on both. I guess you won't know until you try ....
06-25-2010, 01:36 AM
#7
Thread Starter
Join Date: May 2010
Location: ca
Posts: 27
Strange, the factory transmission in a 69 351 would be an FMX, which was also used in the 71-73 351 2V.
im not 100% sure its a C6 now that u say factory 351c 2v came with a fmx.. ive been told that 351c and up came with c6 no one til now had mentioned the fmx..
so that brings up another question how can i tell the difference between a C6 and FMX?? part#, marking?
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