T5 conversion advice, please

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iamlance

New Member

Sep 18, 2004

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Sep 25, 2004

#1

• Sep 25, 2004

• #1

I called a Mustang only store and explained that I was doing a T5 conversion on a 65 Mustang. It is a 4 speed car already. The guy told me that all I needed was the adaptor plate for the bell housing and the crossmember. He said the slip yokes were the same and the original trans mount was retained.
Well , the slip yokes are not the same and the trans mount will not work. The trans mounts hight prevents it from fitting in between the crossmember and the trans , even if the trans is jacked into the floorboards. The original yoke is too small for the T5. I have the T5 yoke , but the local parts store can't come up with a u-joint that will mount the new slip yoke to the old driveshaft. The trans is out of a 93 Mustang , if it matters. This bites big time because the car is stuck on my lift at work. Can anyone shed some light on this??? I did a search and saw several pictures of what is needed for the swap and they all showed a mount and a slip yoke. I have a Mustangs Unlimited crossmember if it matters.
THANKS !!!!!!!!!!

 

SandSprite

Member

Feb 8, 2003

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16

L.A., CA

Sep 25, 2004

#2

• Sep 25, 2004

• #2

Was your 4sp a T10 or a toploader? I had a toploader and the slip yoke worked fine in the T5. The tranny mount was also the same part (from a toploader), you just use the other holes -- (left & right) instead of the original holes (front and back). I used the ron morris crossmember, but it shouldn't matter which one you use. I also had to shorten my driveshaft 3/4".
Try to look at a toploader/c4 slip yoke and toploader tranny mount at the parts store. IIRC though, early toploaders and maybe t10's were 25 spline and the later ones were 28 spline output shafts.

 

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iamlance

New Member

Sep 18, 2004

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Sep 25, 2004

#3

• Sep 25, 2004

• #3

Lucky me!!!! I've got an early toploader 25 spline. What do I win?? So that explains the slip yoke problem. I'm not sure what your saying about the mount. The one I have has 2 holes and 2 studs. The 2 holes match up to the two threaded holes in the trans and the two studs go thru the crossmember. As best I can see , there is no other option. Thanks much for the reply.
Has any one else encountered this mount problem or found a u-joint that will mate the 65 driveshaft to the 93 yoke?? (93 yoke is shorter , btw, and it looks like if I can get a u-joint , I won't have to shorten the driveshaft.

 

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CPonds66

New Member

Apr 29, 2004

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Irvine, CA

Sep 25, 2004

#4

• Sep 25, 2004

• #4

I don't know if maybe this is your problem but the mount isn't horizontically symmetrical. The holes are a little cockeyed to one side. Also, don't tighten anything up until it is all together.

 

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iamlance

New Member

Sep 18, 2004

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Sep 25, 2004

#5

• Sep 25, 2004

• #5

Thanks. The holes line up pretty good. The problem is that to get the mount in place , the trans is plastered up against the floorboards.

 

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Ronstang

New Member

Apr 4, 2004

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Houston Texas

Sep 25, 2004

#6

• Sep 25, 2004

• #6

iamlance said:

Thanks. The holes line up pretty good. The problem is that to get the mount in place , the trans is plastered up against the floorboards.

Click to expand...

That is because there is no way the factory crossmember can be used unless you cut a notch out of the built in upper crossmember to let the rail shifter boss move farther up. I did this and reboxed in the crossmember to retain strength. I also modified a stock crossmember since the T-5 sits farther back and I lowered the mounting point just a little to maintain the proper 3 degree drivetrain angle. You can buy a commercially available crossmember but it sits lower so no cutting of the upper crossmember is necessary and it results in an improper drivetrain angle. The mount I use is the C4 mount for the year of the vehicle (heck this mount was used on just about every vehicle that ever had a C4!). Good luck.

 

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iamlance

New Member

Sep 18, 2004

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Sep 25, 2004

#7

• Sep 25, 2004

• #7

The crossmember I am using is specifically made for this conversion. I looked at a picture of the mount which is supposed to fit and it does look shorter in the picture. My car may have had the wrong mount on it to begin with. I hope the auto parts store has one to compare. Thanks again for the help.

 

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6T6coupe

Founding Member

Jul 15, 2000

219

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Sep 25, 2004

#8

• Sep 25, 2004

• #8

On my conversion I used the 66 transmission mount. At first I got a mount for a late mustang (to match the transmission0 and it was too tall. The early mount is shorter.

 

MrBobMarley

Founding Member

Oct 7, 2002

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Ft Myers, FL

Sep 25, 2004

#9

• Sep 25, 2004

• #9

Yes the early mount it the ticket here, I used a c4 trany mount and it works great. From what the driveshaft shop told me, original u-joints for 65-66 stangs had 1" cups on all four sides. I'm sure a local shop can mate and balance the yoke to your d/s for you. I just went ahead and had a new one built form parts the guy had laying around. I'm pretty sure the yoke was a 28 spline too.

 

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gjz30075

Member

Aug 30, 2004

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Roswell, Ga

Sep 25, 2004

#10

• Sep 25, 2004

• #10

Now that you have the crossmember stuff straightened out, don't forget to change the speedo gear to a T5 or C4 gear. It has the spiral going the other way from a toploader gear.

 

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iamlance

New Member

Sep 18, 2004

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Sep 26, 2004

#11

• Sep 26, 2004

• #11

The original trans mount was wrong ( maybe thats what caused the intense vibration??? ). I got the right 1 2day and everything is in place. Still closer 2 the floor than i would like, but ill see what happens. 1 ujoint from being mobile!!!