Outer Limits 4x4 Board

g'day all,

Id like some advice on your experiences with diff-ratios in relation to increase tyre diameter. I know that with the increased diameter your revs drop and the trucks more sluggish on take-off. My 265/75x16 BFG's have done this to my truck. If I wanted to put on 32/11.5x15 or 33/10.5x15 tyres what diff ratio would I need to put in my diff housing to give it the same perfomance that it had as if it was standard. The factory V6 diff ratio is 4.56:1 so I'm just guessing here but would 4.88:1 cure my problem or should I choose another ratio? And will the new ratio also bring my speedo back to standard? I have a Marks Adaptors variable ratio box I use for the speedo at the moment.

Any advice is appreciated.

Thanks

max

What gearbox are you using
The Commodore V6 should be about 2600/2700 at 110 kmh

Adrian
www.chevtorque.com.au

NAH MATE,

its a standard hilux 3.4 litre engine and standard 5 speed. Not the holden 3.8litre.

I shouldve clarrified myself abit better.

max

4.556 in the non turbo diesels might suit.

Diff Ratio (5L) 4.556:1 (1KZ-T) 3.727:1 (5VZ-FE) 4.100:1

thanks blakpak, but I was pretty sure the 5VZ had a 4.56:1 ratio in it standard. R u sure its 4.11:1 ? Im not doubting you I just wanna make sure.

If my hilux has got a 4.1:1 ratio, then would fitting 4.56:1 with my 265/75x16 BFG's go well to giving me better performance or would that ratio not suit that tyre size?

thanks mate,

max

My XTRA cab hilux 2003 model, factory V6 3.4L engined, has 4.1 diff ratios. Confirmed by Toyota.

I think the Dual cabs have a different ratio, but not sure. You can contact any Toyota dealership, give em your rego, engine and chassis number and they can print out a technical report on the vehicle, all sorts of useful info.

Cheers

Yep I got my info off Toyota. I think the 2.7 4cly had the 4.1 as well.

thanks blakpak, I appreciate it.

What ratios does anybody else use with 33's on their hilux?

max

97-01 2.7 petrol has 4.3

97-01 2.7 petrol has 4.3