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  #1  
Old 10-08-2007, 07:21 PM
Texas Landau Texas Landau is offline
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Default No Reverse!

My reverse just quit working today; No slipping,growling,grinding,clunking, or fanfare. All the foreward gears work great, no linkage problems, fluid looks and smells fine, and topped off. It simply has no reverse.

My question is:has anyone installed a C6 in a 61-63 Thunderbird? I know I will need a driveshaft, but my main concern is the trans mount.

Thanks!
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  #2  
Old 10-08-2007, 08:26 PM
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Alexander Alexander is offline
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You probably have a cracked transmission case.

I know people have done this C6 conversion with the Squarebirds. The Rocketbirds are probably similar:

Bill Van Ess posted this on the Squarebirds newslist:

Quote:
You can use the stock Squarebird transmission crossmember to use with the
C6 transmission. All you have to do is mount the crossmember back one
bolt hole. In other words, use the rear mounting hole for the front of
the stock crossmember and then drill two new holes for the rear of the
crossmember. You don't need to find a different crossmember. You also
will need a newer style starter. I didn't change the flywheel when I did
my conversion 26 years ago. You can use any C6 made for a big block. You
can find them in any full sized Ford, T-Bird, Mercury or Lincoln. that
had a 390 or 428 engine built after 1966. If I remember right, you may
have to have the driveshaft shortened a little bit also.
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  #3  
Old 10-09-2007, 07:57 AM
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Alexander Alexander is offline
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Default Cruise-O-Matic to c6 conversion

There is a good post here on the VTCI site on how to put a C6 in a 1961. Unfortunately all the great photos he posted are no longer viewable. http://www.vintagethunderbirdclub.or...opic.php?t=355

Posted by ValveTubeHead:

Quote:
The devil in the details

Glad you asked Alan...there are a few details to discuss.
Sorry, so many photos, I just grabbed the first few I came across without giving the continuity they deserve.

The cross-member is hybrid '61 tbird c/m + '66 tbird C6. I wanted to retain and use the original x-member mounting tabs used for c/m. The tangs on the hybrid x-member are from the c/m. The center portion, including the E-brake stand off (without modification) are directly from '66. The x-member mounting holes for the C6 are about 3" aft of c/m and so the center C6 section is centered and relocated this difference (a little box tubing stock and several gussets). As mentioned, my little concern regarding driveshaft alignment...I suspect a few shims would solve any issue. Note some of the clearance issues associated with the C6 case/pan and x-member when relocating...a few mid course corrections were performed, probably could have been avoided if planned better.

I'll post a few pix of the flat stock linkage mod to make the connection. It's so simple, its ridiculous. On the '66 tbird, there is a bellcrank widget used to complete the linkage. The clearances in this area are tight...and the '66 requires the bell crank...however, the '61 cannot accommodate it without modification to associated '66 linkage and bellcrank it self. Longstoryshort...don't bother with the bellcrank. Use the '61 column shift linkage, '66 C6 gear select armature and flatstock (or similar) extension tab mod.

I need to recheck the kickdown situation...been a while since I trial fitted it. I'll follow up.

A kit would be simple...the cross-member would be easy enough to fab from scratch...however, I think the tunnel bracing is different in '64-66 so may be slightly different x-member mod...and for that matter, linkage. I suspect the bellcrank would work for the flairbird guys.

The more illusive component is the '66 tbird C6 gear select arm. As far as I can tell, most of the C6 arms are significantly different.
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Old 10-09-2007, 01:27 PM
Texas Landau Texas Landau is offline
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Thanks, folks!

I was able to view the photos using the link. It seems to be a pretty straightforeward swap, a little welding on to the trans mount and a linkage fab is all. I already have a later model starter and flywheel (I dropped my c/m 3 times to figure the combo out lol!) and I have a C6. It is nearly identical in length to the c/m, but the mount is in a different place. I think I can extend my mount.....or I may just have a c/m rebuilt, as I have a couple extra ones laying around.

Thanks again for the great help!

Randy
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Old 05-28-2009, 02:29 AM
JCLipka JCLipka is offline
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Default How'd that C-6 conversion go?

I read your post from '07...I'm getting ready to do a C6 in my 1960 Convertible. I'd love any suggestions or info you can give me.
Thanks;
John

PS..anyone who reads this and has info, please respond.
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