cossie box

[vapy]

this may sound bit of a strange thead but dose anyone know if there would be a advantage to changeing the rover gearbox to the cosworth one cuz me mates{cossie box} is compleetly different geared to mine{rover box} both 4.0 cars any ideas

[WWESTY]

Blimey....wondered what this thread was all about when I read the title....... Cossie!!

[M@H]

I guess the other half of this question is what to do with the Diff.. The newer BTR Diff has a final drive of 3.45 to 1, and the later BW T5 Box has a ratio of 0.8 to 1 in top so this would give 2760 rpm per 1000. The Old GKN Diff has a final drive of 3.31 to 1, and the early LT77 Box has a ratio of 0.83 to 1 in top so this would give 2747 rpm per 1000.

Cheers,
Matt.

[chassis 33]

So what ratio do I get with a GKN diff and a T5 box as fitted to my '95 car?

ETA, I should have done the sums before asking...by the logic above I should be at 2.648:1 overall!

Regrds
Iain

Edited by chassis 33 on Wednesday 7th June 12:18

[900ss]

These may help a little assuming you are talking Chimaera T5 box

Std 1996 4.0 T5 box below
http://img.photobucket.com/albums/070

Cossie T5 box with Chimaera T5 in foreground

http://img.photobucket.com/albums/070

As you can see the gear lever on a Cossie box is a good 4" ish back
What you can't see is the prop shaft on a Cossie n TVR box is diffo. The Chimaera box output spline is larger so you will need a matching prop. The input shaft clutch spline is deeper aswell and the nose (clutch bearing carrier part) is also a diffo diameter, plus as mentioned above the g/box mount holes are spaced diffo.
Saying all that, a Cossie T5 box will bolt straight upto a 4.0 V8 engine (given all the bits lol)
hths

Edited by 900ss on Wednesday 7th June 22:18

[vapy]

thanx for the advice am goin to leave it as it is lol thanx for convinsing me

[M@H]

vapy said:

thanx for the advice am goin to leave it

sensible choice sir !

Edited by M@H on Thursday 8th June 18:07

[brummiewedge]

My 4.6 was in my wedge, now in chim. The engine suits the chim gearing much better. In my opinion, the gearshift is also more positive.