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View Full Version : Just one question.... Wanted JC5 gearbox


minesa3
14-09-2010, 16:12
Hi all, I've got a Williams 3 and I need to replace the gearbox I just need to know whether or not the Williams 1,2 or 3 uses a different gearbox to the 1.8 16v. Basically do I have to replace it with a gearbox from a Williams?
Thanks....
snowman
14-09-2010, 16:24
yes Williams = JC5,Valver =JB3
snowman
14-09-2010, 16:25
Theyll both fit though,i run a JB3 on my Williams engine but if you want original the JC5 it is
minesa3
15-09-2010, 18:56
Thats perfect thanks very much for your help,

If anyone can suggest a suitable vendor for just such a component I'm all ears...
Laine_16v
18-09-2010, 19:43
Renault for a recon box like £600 - £900 depending on your luck and branch i think.

Or on any of the renault forums. I wanted one for ages, believe me finding a good Williams JC5 014 is quite a task these days.
shag
19-09-2010, 00:14
im in the same situation im thinking of a valver box for my williams wats the diffrence in acceleration i presume same from standstill and lose top end would this be right
Laine_16v
19-09-2010, 12:19
Valver box has a longer 4th and shorter 5th.

Williams box has a shorter 4th and longer 5th.
shag
19-09-2010, 13:55
bloody belting
Yanoo_
19-09-2010, 14:54
If I were you I would not use JB3 instead of JC5. JC5 is stronger (tapered bearings, wider teeths) and the gear ratio matches enough good to the F7R torque curve.

I wrote a software, called Renault váltók (Renault gearboxes in English), you can easily compare different Renault gearboxes (and gear ratios) by this program.

http://www.freeweb.hu/yanooka/downloads.php?id=Setup_Renault_valtok_1_1.exe

By the way JC5-129 and JC5-130 have the same ratios as JC5-014 (1st: 3.09, 2nd: 1.863, 3rd: 1.321, 4th: 1.029, 5th: 0.794, FD: 4.067). 129 has speedo cable output, 130 doesn't have but a machine shop can do it, so it's not matter.