Need a T5WC transmission rebuild

Marty Howard · **Posted:** Thu Apr 22, 2010 9:24 am

Kevin Harvey wrote:

Marty Howard wrote:

Kevin Harvey wrote:

Marty Howard wrote:

Thanks guys, I will start calling around. I want to have this back in the car for the Alfa event.

Don't you have too many cylinders to run with those guys? I thought they were limited to 2.0 liters or something.

Instuctors are exempt.

It's 3 liters and smaller

Marty, Marty, Marty... you are leaving yourself and ALL instructors open to a snide comment. :lol:

I'll take the high road.

Yes, that was pretty bad. That's what I get for trying to respond with only 30 seconds before a meeting.

Sorry to all the instructors who can actually spell and type.

Marty Howard · **Posted:** Thu Apr 22, 2010 9:28 am

Jason Mauldin wrote:

steve remchak wrote:

Jason Mauldin wrote:

It's a T5. Anyone can handle that rebuild. Take it to the closest transmission shop.

really Jason? not to pick a fight, but really?

i realize this club was founded at the grassroots level; but, any local shop?

Have you ever looked inside a T5? It's about as simple as a transmission can get. Seriously, if someone can't pull off a rebuild on this transmission, they shouldn't be in the business. Just be glad that I didn't suggest that he do it himself.

If I had the time and ambition I might try it. I am looking for more than just a rebuild though. I want a place that can add some of the T5Z parts, including the rear shaft support bracket and such.

Jason Mauldin · **Posted:** Thu Apr 22, 2010 9:43 am

How about a spare?
http://www.horsepowerjunkies.com/forums ... hp?t=99393

If not, read to the bottom and he lists a place in Sanford that has experience with T5s.

Richard Casto · **Posted:** Thu Apr 22, 2010 9:44 am

Interesting thing is I am starting up a garage business to rebuild transmissions, but with a focus on early Porsche transmission. My plan is to eventually look at doing BMW and T5. I almost suggested that I would give it a try for next to nothing if it was as stock rebuild. But I am not ready to tackle what you are looking for (parts swap/updates).

There is actually a third party book out there that describes how to rebuild a stock T5.

Jason Mauldin · **Posted:** Thu Apr 22, 2010 9:49 am

http://pomoforacing.com/tech/T5Rebuild2002.pdf

Marty Howard · **Posted:** Thu Apr 22, 2010 10:05 am

Jason Mauldin wrote:

How about a spare?
http://www.horsepowerjunkies.com/forums ... hp?t=99393

If not, read to the bottom and he lists a place in Sanford that has experience with T5s.

that's a great deal. Too bad it has the 3.35 gear set. I have to run the 2.73 for spec class.

Richard Casto · **Posted:** Thu Apr 22, 2010 10:58 am

Jason Mauldin wrote:

http://pomoforacing.com/tech/T5Rebuild2002.pdf

Thats a pretty nice document.

Stephen Westerfield · **Posted:** Thu Apr 22, 2010 11:10 am

I have this book if you want to borrow it Marty. Coincidentally, it has in detail (with great pictures) how to rebuild a Honda B-series tranny as well as a T5. I haven't looked through the T5 section, but the B-series section was very helpful in going through my Integra tranny.

jakepressley · **Posted:** Thu Apr 22, 2010 12:22 pm

Marty

I know that your rear end needs to stay stock but is there anything that says you can't change gearing within the tranny.

The reason i ask is that the od (5th gear) in the T-5 is pretty weak.. I know there are some kits out there to maintain RPM's from 4th to 5th.

Now that I think of it, do you ever hit 5th with 2:73 gearing?

good luck, I'll probably be PMing you within a year about who you choose, as this seems to be a weak link within these drivetrains..

jp

Jason Mauldin · **Posted:** Thu Apr 22, 2010 12:49 pm

Richard Casto wrote:

Jason Mauldin wrote:

http://pomoforacing.com/tech/T5Rebuild2002.pdf

Thats a pretty nice document.

Come on Richard, you know you want to help Marty out.

Richard Casto · **Posted:** Thu Apr 22, 2010 4:13 pm

Jason Mauldin wrote:

Richard Casto wrote:

Jason Mauldin wrote:

http://pomoforacing.com/tech/T5Rebuild2002.pdf

Thats a pretty nice document.

Come on Richard, you know you want to help Marty out.

I would in a second. I just don't want to pass myself off as a T5 expert.

I would just have to say that I have some manual transmission experience but my T5 experience would consist of something like the PDF above and the book Stephen and I mentioned above. Frankly assuming the basic box don't have some hidden flaw, I suspect that with the right tools either/both of those resources would be enough to get it done including some basic parts swaping. Manual transmissions are not rocket science.

Richard Casto · **Posted:** Thu Apr 22, 2010 4:35 pm

One extra thing to add about rebuilding a transmission. Where the experience pays off is in two areas. First, when you disassemble it's being able to quickly spot the "what is wrong" or "what is odd". I am dealing with 40+ year old Porsche transmissions which may have already been apart a few times before. I have seen them put back together wrong with the wrong shims or thrust plates used in the wrong places (and the resulting problems it can cause). You can easily take them apart and put them right back together the wrong way if you don't catch the problem.

The second is that you can follow directions pretty easily and get the job done, but its going to take you 10 times as long as someone who has done it 100 times. Some of this is because there are always "tricks" to doing various tasks that are not always known.

Usually factory manuals do not describe either of the above, but some of the guides you see in third party books or online will go into both the common failures points to look for as well as tricks for quick and easy disassembly and assembly.

Marty Howard · **Posted:** Thu Apr 22, 2010 10:36 pm

jakepressley wrote:

Marty

I know that your rear end needs to stay stock but is there anything that says you can't change gearing within the tranny.

The reason i ask is that the od (5th gear) in the T-5 is pretty weak.. I know there are some kits out there to maintain RPM's from 4th to 5th.

Now that I think of it, do you ever hit 5th with 2:73 gearing?

good luck, I'll probably be PMing you within a year about who you choose, as this seems to be a weak link within these drivetrains..

jp

Unfortunately there is no wiggle room on the drivetrain:

Quote:

Eligibility
An OEM T-5 transmission that was originally offered in a model year 1987-1993 V8 Mustang must be used, unless otherwise specified by these rules. Standard ratios must be maintained.
Alternatively, a Tremec (part#3550 or TKO500) or T5Z (part #M-7003- Z) may be used, but only with the following ratios: 1st gear 3.27, 2nd gear 1.98 or 1.97, 3rd gear 1.34, 4th gear 1.00, 5th gear .68. or a Tremec T5Z (part #M-7003-Z) may be used. Transmissions must be
unmodified and gears may not be shaved, polished, trimmed, or otherwise changed.

I have only hit 5th on the long back straight at VIR and even then it was only for the very last section.

The T5 really is a the weak link. as I have found out is the standard T5 casing tends to flex under high g-loads (especially tight right handers). This can cause the edges of the gears to wear or the 3-4 fork to warp/bend. I am pretty sure it was the latter on mine leading to full failure.

The T5Z and the Tremac seem to fix the issue with better casings and front and rear brace plates.

Bernie Baake · **Posted:** Fri Apr 23, 2010 9:22 pm

I have alot of trouble believing that the T5 case flexes!!!! the edge of the gear wear is most often caused by bad synchros or premature release of the clutch while the gears are in transition, the same is true for the bent fork, especially 3/4 which are the most used gears. If the case flexed I believe that the bearings would fail or the input shaft would shear. Drag racers frequently experience input shaft failure on T5's due to the high torque loads.JMHO

steve remchak · **Posted:** Fri Apr 23, 2010 9:44 pm

Bernie Baake wrote:

I have alot of trouble believing that the T5 case flexes!!!! the edge of the gear wear is most often caused by bad synchros or premature release of the clutch while the gears are in transition, the same is true for the bent fork, especially 3/4 which are the most used gears. If the case flexed I believe that the bearings would fail or the input shaft would shear. Drag racers frequently experience input shaft failure on T5's due to the high torque loads.JMHO

might be the tranny mounts contributing to this also Bernie. i can't speak for this transmission but on my E36 before i went to solid mounts i would often hit the area between gears as the body and tranny twisted.

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Need a T5WC transmission rebuild

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