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Post by frodo_monkey » Tue Feb 20, 2018 2:20 pm

Blimey, weak gearbox or arms like Popeye?! Didn't know you could fit a T5, might look into that although there is a price attached... does it bolt straight to a Type 9 bellhousing?



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Post by frodo_monkey » Tue Feb 20, 2018 2:22 pm

In fact I had a T5 in a TVR Griffith (90s shape) a while back - seem to remember they are silly strong but quite a 'solid' gearchange :)



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Post by turbster » Tue Feb 20, 2018 2:28 pm

Weak box, I'm very gentle with my cars :wink:

The TVR boxes in my Cerbera and Chimaera didn't have anywhere near as nice change as the cossie one before the quickshift and after it was so so sweet and precise. I machined a simple adaptor plate out of ally, I think you have to make up 25mm and the input splines are the same as type 5 etc. Ric Wood/Burtons do a bell housing but I used the plate and short SE5 bellhousing used with the o/d box as the later one is too long.. All good fun!!
Last edited by turbster on Tue Feb 20, 2018 9:34 pm, edited 1 time in total.


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Post by BigBobPilot » Tue Feb 20, 2018 9:27 pm

Yep as Paul says, adapter plate or Ric Wood alloy bell housing.

Big Bob has a T5 box (with an adapter plate), as does my (shared with Iain Daniels) Marcos. The Marcos is also a V6 Essex, it has a Ric Wood bellhousing with AP multi-plate clutch with concentric slave, it works well. Going T5 is not the cheapest option, but it is robust.

Also like Paul, a 3.77:1 diff would be better for a race car with a 5 speed box, better acceleration everywhere, but unlikely to affect the top speed on all but the longest straight. I doubt it would hold you back at Snetterton, which is probably the longest / fastest straight on a UK circuit? Our Marcos runs a 3.71 diff, with 205/60 x 13 tyres, we have never run out of revs in 5th, but our engine does rev to 7400.

You said you have your chassis there already, so Iain has 2 off T5 boxes in stock, but they are both the later TVR type with a forward gear lever position. The tail shaft can be swapped for the Cossie type rear mounted lever (which is what you would need). However, alot of the TVR boys want to do the swap the other way round, to delete the TVR remote adapter; so there may be swap options available? I'll find the link to the TVR topic


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Post by BigBobPilot » Tue Feb 20, 2018 9:40 pm

Ok, a correction, the earlier TVR T5 boxes didn't have the rear Cossie type lever position, but one in-between, see here:

https://www.pistonheads.com/gassing/topic.asp?t=1495435


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Post by frodo_monkey » Tue Feb 20, 2018 9:48 pm

Definite food for thought gents, thank you very much. Need to go and drop some bits with Iain for the chassis build at some point, so I’ll chat to him about it then :)



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Post by turbster » Tue Feb 20, 2018 9:53 pm

BigBobPilot wrote:
Tue Feb 20, 2018 9:40 pm
Ok, a correction, the earlier TVR T5 boxes didn't have the rear Cossie type lever position, but one in-between, see here:

https://www.pistonheads.com/gassing/topic.asp?t=1495435
The quick shift was cranked forward so the mid position version could work Ben.. The speed six version would be no good though, mine only works because the engine is on my lap :lol:


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Post by BigBobPilot » Tue Feb 20, 2018 9:59 pm

The front lever position (5 speed too) definitely wouldn't work. We have it in Big Bob, but the engine in that was moved a long way back too...


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Post by efi_sprintgte » Tue Feb 20, 2018 10:03 pm

Yep, T5 is a great box and would be my first choice.

I have to say Turbster was very unlucky with his 4speeds.

Unless I’m mistaken Big Bob ran a 4speed BGH for a fair few years on slicks??

4 speed has good ratios (as long as it’s the “long second” box).


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Post by BigBobPilot » Tue Feb 20, 2018 10:14 pm

Yes, correct for Big Bob, but it did strip all the teeth off 3rd gear when the 4 speed box failed. It was on a 2nd to 3rd change up. I ran with a standard 2nd hand 4 speed box for the remainder of the season (hill climbing) but without tyre warming and less agressively starts.

A 5 speed is better for racing though, as it allows you to run a higher diff ratio without sacrificing top speed.


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Post by frodo_monkey » Thu Feb 22, 2018 1:01 pm

So do we think a Cerbera gearbox like this could work (with work) or best off buying a Cossie box to start with?

https://rover.ebay.com/rover/0/0/0?mpre ... 2462509113

The going rate seems to be £1k+ for a Cosworth box...



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Post by BigBobPilot » Thu Feb 22, 2018 6:37 pm

That should work with a slightly rearward cranked gear lever.

In addition to the bellhousing etc. I should have also mentioned you will need a modified propshaft. The output spline for the TVR box is different to the Scimitar / Ford spline. I can't remember whay spline the Cossie box has.

As mentioned before, the T5 isn't the cheapest wsy to go. There are Scimitars & TVR's out there racing with the 4 speed box. One of the rally guys uses a 4 speed OD bix in his SE5(a?). You could go standard, then up grade in the future if / when you think it's necessary.

Also it may be worth just keeping your eyes open for a good price T5. Craig Hughes recently picked up a Cossie one for reasonable money (I can't remember how much).


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Post by philhoward » Thu Feb 22, 2018 6:52 pm

Is this a T5, but badly listed?

https://rover.ebay.com/rover/0/0/0?mpre ... 3495148863

Much cheaper if it is..


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Post by BigBobPilot » Thu Feb 22, 2018 7:04 pm

philhoward wrote:
Thu Feb 22, 2018 6:52 pm
Is this a T5, but badly listed?

https://rover.ebay.com/rover/0/0/0?mpre ... 3495148863

Much cheaper if it is..
Yep, that could be a bargain. It has the Ford type output spline and the rear gear lever position (as Cosworth box).


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Post by frodo_monkey » Thu Feb 22, 2018 9:12 pm

philhoward wrote:
Thu Feb 22, 2018 6:52 pm
Is this a T5, but badly listed?

https://rover.ebay.com/rover/0/0/0?mpre ... 3495148863

Much cheaper if it is..
I did see that one but did a bit of Googling - apparently there are “World Class” T5 boxes a la Cosworth 2WD and TVR, and a weaker version called “Non World Class” fitted to the Camaro/Firebird V6...



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