The V8 Owners Forum -

Hi, Thats good news, it pays to shop around, however you need to be careful.

Have just answered your other post and forgot to warn you .......
The mustang T5 251 can be bought brand new for US$ 1700.
In the UK change that to pounds. More than that and someone is making a lot of money.and it aint you!
If his T5 boxes are anything like his engines I would steer clear of RPI, again that is my own opinion not of this forum ...... though many here would agree.

Agree to all that Mike, Roadcraft have them in stock for £1620 + vat.
I have looked at shipping from the USA but most want silly postage and import charges, what with the pound to dollar !
I still cant find a Speedo drive for the box, seems in the conversions they use the one out of the old box !

Hi, With regards to your speedo cable for the `tang box. Have you tried any of the American car site here in the UK? They may help n locating them or provide an alternative method.
With the UK pound as it is buying from the USA gets expensive what with all the taxes that have to go on top.

If you buy one of those boxes it may be worth your while waiting to see what your up against before you go further.

Back again ...... £1620 plus vat = 1944 ..........£1700 + £30 delivered No vat looks better.

Well its probably the ATF that killed the T5 anyway. ( well known fact for T5 and Type 9 gearboxes and even the LT77).

75W90 is way better for a T5 gearbox.

JP,
`Tremec` who make all the T5 boxes now including the world class ones, would not agree with you.

We wheren't talking Tremec here but BW.
Cossy T5 aint Tremec. Cossy T5 is a low spec WorldClass BW transmission.
Not all T5's made are Tremec. There are thousands of different types T5 transmissions made from capable of handling only 150bhp up to 1500bhp.

Ask most rally & race drivers running T5 gearbox ( the ones that don't use a ZF ) ATF is to thin and is an hydraulic fluid, not a lubricant so not suitable for manual transmissions.
Manufacturers only advise ATF in it for a more smoother shift during cold situations, as people won't allow the gearbox to be warmed up properly and start complaining about the hard shifting in cold situations.

If you still want to use ATF, then be sure to put the proper one in as it comes in two classes, friction modified & non friction modified.

JP. wrote:Well its probably the ATF that killed the T5 anyway. ( well known fact for T5 and Type 9 gearboxes and even the LT77).

75W90 is way better for a T5 gearbox.

Not in this case, the lack of ANY lubrication killed it, the only damage was to the end of the main shaft where the needle rollers of the first motion shaft are, the rest of the box looked fine, the gearbox had not been used for years and was OK when removed from the car it was in, it was only changed for a six speed box, the new engine was started and run for 20 minutes at 2000/2500 revs to break the cam in, the new ATF obviously didn't get to the end of the mainshaft that was damaged, if you think about it the first motion shaft is the only part of the gearbox that is moving with the engine running.

ATF has reduced lubrication properties as its not a lubricant but a Hydraulic Fluid.

ATF is hygroscopic also.

Devonrod wrote: if you think about it the first motion shaft is the only part of the gearbox that is moving with the engine running.

And the layshaft. And come to think of it, all the mainshaft gears are spinning as well.

harvey wrote:

Devonrod wrote: if you think about it the first motion shaft is the only part of the gearbox that is moving with the engine running.

And the layshaft. And come to think of it, all the mainshaft gears are spinning as well.

Very true, but the lay shaft and it's bearings are flooded in oil and none of the mainshaft gears are spinning at the actual engine speed. The needle rollers between the first motion shaft and the main shaft are taking the full differential between the engine speed and the stationary mainshaft. The design of the needle chamber is slightly flawed in as much the orifice which allows oil in will at say 2000rpm actually spit the oil out and if the needles were dryish due to long term storage some damage is likely on starting up if taken straight to the sort of revs required for successful cam breaking in session.

Lesson learnt - I will in future put some oil in a box before installing it in the vehicle and tip it up at various angles to flood all the internals.

I think I have found the speedo housing problem, the later Mustangs used a electric sender, the early ones the housing was crimped onto the speedo cable, and looking at a youtube video, the early cables fit the T5