T5 tranny swap

sadlsor7 · 04-14-2001, 01:11 PM

I recently finished a 1965 fastback. I converted it to a T5 with a cable clutch. I used a 1990 T5 flywheel, clutch, and bellhousing. The engine is a 1970 302 I used the crank and ballancer from this engine. I now have a severe vibration in the engine [it is definitly the engine because it does it at while in neutral].Can anyone tell me if the flywheel off of the 1990 engine could cause this and what are my option for fixing this?

induction · 04-14-2001, 09:31 PM

Wow i dunno, you got me on thay one. check an see if your balancer is "spun" ie. broken rubber . is the clutch aligned properly not chattering? How about the pilot bushine , did you use a NEW one? are ya using solid or rubber motor mounts? Is the cross member a good fit & tight . sorry man thats all I can thing of.

------------------

restored '65 coupe

** April Mare **

Chris in NY · 04-14-2001, 10:10 PM

According to the Centerforce catalog (which has flywheels), the '82 and up 302 has a 50 oz. balance type flywheel. And the early 302's have their own flywheel to go with their 28 oz. balance. I'm pretty sure you've got the wrong counterbalance weight on the flywheel you're using and that's what's causing the vibration.

66fastback · 04-15-2001, 12:43 PM

It is definately the flywheel...Ford changed the balance on the 302 in 1982 as Chris in NY has already pointed out. The easiest solution at this point (considering that you have to pull the trans, clutch, and flywheel anyway) would be to take the new flywheel to a machine shop and see if you can have it balanced to the old 28 oz spec.

Another option would be to have the old flywheel drilled to accept the new pressure plate...assuming that it is large enough to do so. Be careful with this one...make sure that the old flywheel will fit inside the new bellhousing before proceeding.

OOOO, you could always buy the rest of that 5.0 and put that engine in there....that way the flywheel you have would already match the balance of the new engine...heh heh, just a thought. Good luck. Doc.

------------------
66 GT Fastback,fuel injected 5.0, 5-speed, cable clutch, JBA's and duals, 3.40 gears and handling mods...just call me "Doc"

[This message has been edited by 66fastback (edited 04-15-2001).]

shovelnose · 04-17-2001, 01:01 AM

Ouch! Get that flywheel out of there. Do not run the car. I had the same problem as you. My motor is still running strong 5 years later but I'm just lucky. I read somewhere that a 1/4oz out of balance is something like 250 lbs of force at 6000 rpm.

Also my 28oz flywheel was not drilled for the 10.5" clutch bolt pattern, and if I'm not mistaken the extra clutch area touched some holes drilled in the flywheel.

If you have the money,buy the FMS billet with 28oz removeable weight. It's drilled for both size clutches and can be 28, 50, or 0 oz weight. Pretty sure it's sfi approved.

BTW you'll love the T-5(If it doesn't break). Gives you room for higher gears.

David Fulford · 04-17-2001, 10:10 AM

You can also buy the billet flywheel from Ford. Shovelnose---are the T-5's really that week. I've heard guys talk about breaking them before but unless they've got serious power, I would think they were just wishful thinking that they had enough power to break them. I drive mine pretty hard and I dynoed right around 320HP and haven't had any problems

shovelnose · 04-18-2001, 01:29 AM

I have the ford billet. I thought FMS was Ford motor sports. Anyway I have the ford one.

The T-5's are hit and miss. My buddy is on his third. (ran 13.5 motor/12.2 nitros) 30-40 passes. I know other people that have toasted them, but I have heard people here running good #'s with no problems. One guy I think has run 10's for 150 passes with 150K on the org. tranny.

83-85(86?) t-5's are weaker and have 2.95 1st compared to 3.35.

I had an SROD. I don't think they are strong, but I put 40-50 passes on it(13.5 best). Worked great when I pulled it out.

I just figured with my buddy putting out $1800(Can.) on three trannys I would spend $400 extra and get a Tremec.

[This message has been edited by shovelnose (edited 04-18-2001).]

66fastback · 04-18-2001, 10:13 AM

the T5 got a pretty bad rep from people who missed third gear. When you miss the third gear shift you bend the shift fork. From then on third gear never fully engages. Most of the time this is the death of a T5, sooner or later the box is trashed.

I have also seen plenty of 10 and 11 second cars running T5's without a problem, as shovelnose pointed out. Shoot, I remember talking to Bart Baer way back when they were just starting out Baer Racing, and they were running the stock T5's. They were road racing with these trannies and not having any problems.

Stay away from the non-world-class boxes...the pre 87 boxes...or just put up about 1200 bucks and buy a new SHD T5, which is a really sweet box.

I've hammered my T5 (stock 89 box) for about 8 years and over 110000 miles (plus the 30k it had when I bought it) and it never complains. The power keeps going up, but the box is holding fine.

------------------
66 GT Fastback,fuel injected 5.0, 5-speed, cable clutch, JBA's and duals, 3.40 gears and handling mods...just call me "Doc"

David Fulford · 04-18-2001, 03:53 PM

That's what I like to hear! I was starting to get paranoid. Thanks.

sadlsor7 · 04-18-2001, 10:27 PM

Thanks for all the wonderful information. I went ahead and bit the big one and bought the FMS flywheel. I an curently puting it in now. My fingers are bloody as I type. Thanks so much again its great to know I am not the only one that this has happened to.

04-14-2001, 01:11 PM	#1
sadlsor7 Registered Member Join Date: Apr 2001 Location: Anthony, Kansas Posts: 4	T5 tranny swap I recently finished a 1965 fastback. I converted it to a T5 with a cable clutch. I used a 1990 T5 flywheel, clutch, and bellhousing. The engine is a 1970 302 I used the crank and ballancer from this engine. I now have a severe vibration in the engine [it is definitly the engine because it does it at while in neutral].Can anyone tell me if the flywheel off of the 1990 engine could cause this and what are my option for fixing this?

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04-14-2001, 09:31 PM	#2
induction The Brit! Join Date: Feb 2001 Location: Across the Pond! Posts: 694	Wow i dunno, you got me on thay one. check an see if your balancer is "spun" ie. broken rubber . is the clutch aligned properly not chattering? How about the pilot bushine , did you use a NEW one? are ya using solid or rubber motor mounts? Is the cross member a good fit & tight . sorry man thats all I can thing of. ------------------ restored '65 coupe April Mare

04-14-2001, 10:10 PM	#3
Chris in NY Registered Member Join Date: Mar 2000 Location: Rochester, NY USA Posts: 19	According to the Centerforce catalog (which has flywheels), the '82 and up 302 has a 50 oz. balance type flywheel. And the early 302's have their own flywheel to go with their 28 oz. balance. I'm pretty sure you've got the wrong counterbalance weight on the flywheel you're using and that's what's causing the vibration.

04-15-2001, 12:43 PM	#4
66fastback Registered Member Join Date: Mar 1999 Location: Dallas, TX Posts: 208	It is definately the flywheel...Ford changed the balance on the 302 in 1982 as Chris in NY has already pointed out. The easiest solution at this point (considering that you have to pull the trans, clutch, and flywheel anyway) would be to take the new flywheel to a machine shop and see if you can have it balanced to the old 28 oz spec. Another option would be to have the old flywheel drilled to accept the new pressure plate...assuming that it is large enough to do so. Be careful with this one...make sure that the old flywheel will fit inside the new bellhousing before proceeding. OOOO, you could always buy the rest of that 5.0 and put that engine in there....that way the flywheel you have would already match the balance of the new engine...heh heh, just a thought. Good luck. Doc. ------------------ 66 GT Fastback,fuel injected 5.0, 5-speed, cable clutch, JBA's and duals, 3.40 gears and handling mods...just call me "Doc" [This message has been edited by 66fastback (edited 04-15-2001).]

04-17-2001, 01:01 AM	#5
shovelnose Registered Member Join Date: Oct 2000 Location: Ontario, Canada Posts: 234	Ouch! Get that flywheel out of there. Do not run the car. I had the same problem as you. My motor is still running strong 5 years later but I'm just lucky. I read somewhere that a 1/4oz out of balance is something like 250 lbs of force at 6000 rpm. Also my 28oz flywheel was not drilled for the 10.5" clutch bolt pattern, and if I'm not mistaken the extra clutch area touched some holes drilled in the flywheel. If you have the money,buy the FMS billet with 28oz removeable weight. It's drilled for both size clutches and can be 28, 50, or 0 oz weight. Pretty sure it's sfi approved. BTW you'll love the T-5(If it doesn't break). Gives you room for higher gears.

04-17-2001, 10:10 AM	#6
David Fulford Registered Member Join Date: Oct 2000 Location: Charlotte NC Posts: 193	You can also buy the billet flywheel from Ford. Shovelnose---are the T-5's really that week. I've heard guys talk about breaking them before but unless they've got serious power, I would think they were just wishful thinking that they had enough power to break them. I drive mine pretty hard and I dynoed right around 320HP and haven't had any problems

04-18-2001, 01:29 AM	#7
shovelnose Registered Member Join Date: Oct 2000 Location: Ontario, Canada Posts: 234	I have the ford billet. I thought FMS was Ford motor sports. Anyway I have the ford one. The T-5's are hit and miss. My buddy is on his third. (ran 13.5 motor/12.2 nitros) 30-40 passes. I know other people that have toasted them, but I have heard people here running good #'s with no problems. One guy I think has run 10's for 150 passes with 150K on the org. tranny. 83-85(86?) t-5's are weaker and have 2.95 1st compared to 3.35. I had an SROD. I don't think they are strong, but I put 40-50 passes on it(13.5 best). Worked great when I pulled it out. I just figured with my buddy putting out $1800(Can.) on three trannys I would spend $400 extra and get a Tremec. [This message has been edited by shovelnose (edited 04-18-2001).]

04-18-2001, 10:13 AM	#8
66fastback Registered Member Join Date: Mar 1999 Location: Dallas, TX Posts: 208	the T5 got a pretty bad rep from people who missed third gear. When you miss the third gear shift you bend the shift fork. From then on third gear never fully engages. Most of the time this is the death of a T5, sooner or later the box is trashed. I have also seen plenty of 10 and 11 second cars running T5's without a problem, as shovelnose pointed out. Shoot, I remember talking to Bart Baer way back when they were just starting out Baer Racing, and they were running the stock T5's. They were road racing with these trannies and not having any problems. Stay away from the non-world-class boxes...the pre 87 boxes...or just put up about 1200 bucks and buy a new SHD T5, which is a really sweet box. I've hammered my T5 (stock 89 box) for about 8 years and over 110000 miles (plus the 30k it had when I bought it) and it never complains. The power keeps going up, but the box is holding fine. ------------------ 66 GT Fastback,fuel injected 5.0, 5-speed, cable clutch, JBA's and duals, 3.40 gears and handling mods...just call me "Doc"

04-18-2001, 03:53 PM	#9
David Fulford Registered Member Join Date: Oct 2000 Location: Charlotte NC Posts: 193	That's what I like to hear! I was starting to get paranoid. Thanks.

04-18-2001, 10:27 PM	#10
sadlsor7 Registered Member Join Date: Apr 2001 Location: Anthony, Kansas Posts: 4	Thanks for all the wonderful information. I went ahead and bit the big one and bought the FMS flywheel. I an curently puting it in now. My fingers are bloody as I type. Thanks so much again its great to know I am not the only one that this has happened to.