Gear Ratios

GEMSTROKA · rice boy Joined: 13 May 2003 Posts: 16

Hey Guys,
I was wondering if anyone out there could help me to figure out which would be the best diff and gearbox to use in my TG gemini to get good performance in the lower gears and a good top speed. Can anyone help me?
Thanks

martin · backyard mechanic Joined: 04 Oct 2001 Posts: 900

by changing diff ratios you can either have one or the other

high top speed will mean the gears rev out longer but acceleration might seem slower

bigger gear ratio will ie 3.9:1 will make you acceleration quicker as more tourqe can be put to the ground

tx1975 · tinkerer Joined: 21 May 2002 Posts: 321

lol, here come another argument about diffs, all sedans had 3.9 except the 8 bolts which were 3.89, diesels had a diff ratio due to having no power and there is also rumor of a different ratio wagon diff but i have yet seen one. all the gearboxes are meant to be the same from 1st to 4th gears, though i swear my early mod 4 spd had way more take off then my 5spd.

elky · petrol head Joined: 06 Oct 2001 Posts: 1149

diesel diff: 3.5:1 and the diesel gearboxes have slighly revised ratios, also when the te was released they changed the 5 speed ratios a bit, I have a very rare dealer press release letter for the te series as well as the holden bible: The parts listing for every gem part in oz

champo · rice boy Joined: 09 Dec 2002 Posts: 26

I agree, my old 4 speed went harder than my 5 im sure. I used to have better pick up, and top end im sure of it. My 4 speed was in my te when I got it, the five speed was out of a tf or tg, either of you guys know whether the ratios changed from te to tf?