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Title: 3speed to 4speed?? is it worth it? Post by: fc_special on February 22, 2004, 07:50:11 AM Hi everyone...driving to the city the other day i felt like the 138 needed a fourth gear..Will i lose alot of value to the car if i put a 4speed gearbox in??.The gearshift is already on the floor...i have been told a toyota 4 speed would suit best is this right??
Title: Re: 3speed to 4speed?? is it worth it? Post by: robbzfc58 on February 22, 2004, 08:25:16 AM hi there im no expert so my opinion may be worth nothing..but the ratio in top gear on 3 or 4 speed is the same..so nothing would be gained if you were looking for taller gearing. if you went to 5 speed toyota ,you'd have the ultimate but you would rarely use 5th gear because its an overdrive..the car would struggle on hills. personally i think the phillipino 4sp boxes from uc toranas & early commodores(4&6 cylinder cars had same box) are nicer than the aussiebox& cheaper..my boys have thrashed em & never killed em!! but top gear ratio is still the same
to fit a toyota 4 or 5 spd would be fairly costly so i suggest ya leave it as it is unless you need to replace it for mechanical reasons cheers trev Title: Re: 3speed to 4speed?? is it worth it? Post by: nicko on February 22, 2004, 12:58:41 PM why not change to a taller diff ratio,that way you dont need any mods
Title: Re: 3speed to 4speed?? is it worth it? Post by: oldgmh on February 22, 2004, 11:31:02 PM The standard ratio is 3.89.
You could try a 3.55 or a 3.36 from later models. They will fit into the existing diff housing okay but the standard grey might not have enough grunt - depends on your driving requirements. Title: Re: 3speed to 4speed?? is it worth it? Post by: RET on February 24, 2004, 06:57:13 AM An otherwise stock grey runs great with a 3.55 diff. I know blokes who have run a grey with a 3.36 but personally I think that's going a bit too far.
cheers RET Title: Re: 3speed to 4speed?? is it worth it? Post by: EJ_Dave on February 25, 2004, 02:41:34 AM I have run both 3.36 and 3.55s behing my stock grey and I'd agree with RET that the 3.55 is the best option. 3.36 is just a little bit too tall down low and at cruising speeds you don't really notice the difference.
David Title: Re: 3speed to 4speed?? is it worth it? Post by: EJ_Dave on February 25, 2004, 02:46:50 AM Forgot to mention that I started with a 3.89.
Some useful numbers to consider. 3.55 is 10% taller than 3.89, 3.36 is 15%. This extra 5% is just pushing it over the edge- you always need to work to get the car up to speed. You don't feel this with 3.55 but you can hang on to 1st for longer. With the 3.89 I always felt that you'd only just be rolling and you'd have to change up. David Title: Re: 3speed to 4speed?? is it worth it? Post by: Nick Athans on February 25, 2004, 11:05:33 PM thanks heaps guys..i was never interested in cars untill i bought my FC last month..now between the manual and work mates ive learnt heaps....much appreciated...Nick.A
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