which v8 manual gearbox

Toyota Supra 'boxes seem to be the favourite in oz, for V8s.

Google "supra gearbox conversion" for a few ideas/threads

I think the T5's were upgraded, virtually year on year for the Mustangs, to cope with the ever increasing power of the GT's. So I would imagine buying one would be a right minefield. Every one would be advertised as the stronger box, just like every small block chevy is a 4 bolt 350.

Heres one thats a bit off the wall, Getrag 290 5 speed out of a Jag XJ/XJS 4.0 ltr. They were rated at 512 Nm (380 lbs/ft), which is what the straight 6 supercharged XJR's were rated at funnily enough

In truth, the XJR's made it a bit more than that (probably around 400 lbs/ft), especially once the supercharger had bedded in.

Don't know how easy one would be to find, they also have an integral bell housing, which is a bit of a pain.

Sean

"T5" is like saying "small block". It's a family, not a specific transmission.

So what 5.7L engine's in the Firenza anyway?

A T5-Z edition, which is called the Motorsport World Class unit, for example, is readily available new for around 1200.00 USD. I have a few in stock myself here at Team Blitz for our Capri V8 conversion customers. Used T5s are easy to identify. There's loads of T5 charts with ID info, and ratios, and TQ ratings.

The properly selected T5 will do fine behind a stock SBF, goodness sakes, not even an issue. You just gotta know what the hell you're looking for and what you need to buy.

Norm

like said the world class t5 will work.. cheep enough look in america in small adds seen um for as little as 50 dollars I kid u not...

failing that again been said a supra turbo box (R154 out of a mk3 3lturbo or 2.5TT only) the n/a ones can be used but go for the w58 or early "iron" box from a celica supra.. the iron box are getting hard to find but some say they are weak others had no probs with 500hp no probs.. my boss had a sbc in a healey on one for ages prob no more than 350hp tbh but gave it hell evrywhere for years hillclimbs too.. still fine!
and the ausies use the w58 behind v8's again prob handle 500hp as loge as you are not consistantly trying to "hook-up" 14" slicks in the dry in a 2 tonne car you should be fine tbh..

edit:
to add another gearbox try the getrag 265 dogleg in biimer m535, 635, jag manuals etc.. very strong and you can get a bargain if u look hard..
or pay 350 to get one easy..
si

its all relative. its torque thats breaks boxes/axles etc..
ask yourself this:
if your engine produces 600ftlbs torque at 3500rpm and you drop the clutch at that many revs with the rear hubs bolted to the floor with zero clutch slippage the engine will stall at thet piont and the gearbox will be seeing a genuine 600ftlbs of torque..
but tbh if you are launching a light car (viva) with 10" sticky road tyres at 1750rpm with 3/4 throttle and the clutch will slip slightly and takeup. then there will be breakaway wheelspin.. and by the time u "hook-up" u will be already moving.. the gearbox may only be seeing 150ftlbs of torque anyway.. and so it if it breaks once a year and the replacement is a 50 quid item thats readily available (see supra w58 box) then whats the probs??

thats the way I see it anyway.. I will let you kow how many w58's I kill in my 318 turbo barracuda when its done!
just my 52p
si

I have been using a w58 iron case for ages, not had any problems with it either other than the rear seal on the tailshaft, beleive me this gearbox has taken some serioussh-t, with many 1.5sec 60ft launches up the pod,
I made my own conversion bellhousing, but this company makes bellhousings to fit almost anything to anything.
www.dellowauto.com.au/catalogue/DellowAutomotive.pdf

going from experiance I would go with the Tremec TKO 600 that way you can be sure of it being future proofed for any future power mods its what I run on the the estate and they knock spots off the T5 world class found on the fox body mustangs . I know this because I had the heavy duty T5 on my old 2 door v8 mk3 it lasted just over a month the tremec has been in for 2 years now with no problem at all .its also the box found on a lot of OE powerful cars Corvette viper 2005 mustang gt ect

[quote author=teamblitz board=general thread=66498 post=892654 time=1251412255The properly selected T5 will do fine behind a stock SBF, goodness sakes, not even an issue. You just gotta know what the hell you're looking for and what you need to buy.
[/quote]

his isn't a stock small block though. Hense suggesting he look at something stonger. T5 might be fine for stock applications (Ford designers aren't stupid) but for drag racing they don't seem to last very long even in stockish cars. This might be due to them being 15 years old or wharever before takign to the track, but, again, hense my suggestion to look at a stonger box to start with.

I thought the T5 in the 'stang was the same pretty much regardless? I am aware the T5 used in various other applications is not the same deal.

And I occasionally express myself in terms where I expect other people to know the assumptions I am making...

Not at all, as I said earlier. SBF T5's range from 235 to 330 TQ rating as factory-supplied from Ford, in all sorts of ratios, with various speedo and input shaft variations. There must be something like 40 different distinct p/n's from Ford/B-W.



LOL ;D