pinion size with a gtb
 

hi just fitted a 4.gtb in the worlds car wanted to know if anyone could suggest what size pinion i should start with { im no good working ovarall ratios out}

Hi there, which spur are you running. If you are running a 78 then you want to be somewhere in the area of 15,16,17 but if you are running a 81 then you might be able to take it up a pinion, or something in that range. And is it a 4.5 because on the post is says 4.gtb:confused:

ye its a 4.5 and its kit spure gear

That car was faaaaaaaaaaaaassssssssstttttt on Sat. night.

cheers neil hope its as quick outdoors i just put a 16 pinion on i think

It'll be great outdoors mate.:)

My Bj4we was bloody fast with a 4.5 gtb in it. So fast, that one night down at TRCC i decided , in the break between finals and qualifying, to launch my car up a ramp going straight up the far wall. It was so fast that it actualy hit the roof, not only once but twice. After, it didnt do to well in the final.:rolleyes:

16/78 would be a decent starting point I should think

cheers rich for that information:)

15/16 78. iF IT IS A BIG TRACK 16 will do the job. I would make sure your slipper is set well or you may not have many gears left on the dif.

hey all, first time here and saw this thread. Any ideas or suggestions on gearing for full time 4wd with gtb and ss13.5 pro stock. i currently have 81t spur but also have 78t i can put in. The track is medium sized, outdoors, hardpacked and moist. Thanks all
Andrew

sorry, I have no idea what to gear a stock motor.