Loganator160

Hi guys, 

I own a 98hilux. It's a Ln167, with both the g52 gearbox and 5l turboed motor recently refurbished. Cruising at 100 the engine is revving at 28-2900. It's loud. Can't get much more speed then that without it sounding like it's gonna blow. 

So I'm thinking of changing the diff gear ratio. Currently it's 3.9. If I change it to 3.4 am I going to low? Will this stress the drive train to much? 

I've got brand new 29 tyres  atm, so want to stick with them for a while yet. But might go 31 in the future. Did some quick maths in differences. 

3.9 to 3.4 gives 13% difference 

29 to 31 tyres is 6.8%

If I were to go both in the future that's 20%. Is that to much? It's fine taking off due to the turbo, I don't tow and tbh ain't going to be hardcore 4wding. More highway ks in the neat future from Adelaide to Darwin with a little off road. 

What are your thoughts and experiences?

Ah well, I'll take it on the chin and lump it for a few years then get a cruiser!

Hi all, I've got a 1998 hilux. The motor model is a 5L  with aftermarket turbo. Driving back from pt Augusta to Adelaide the gearbox lost power in 5th. Can only use 4th gear now. No 1st, 2nd, 3rd or reverse. I understand 4th works cause its straight through. It was rebuilt only 23months ago going by receipts. (bought second hand 2 months back).

Chatted to the Mechanic today and he says he can replace it for 950 plus labour. I asked him about the possibility of putting an R151 in and he wasn't sure. If I purchase an R151 is it a straight swap over? From what I gather they are a stronger gearbox. If it's not a straight swap over what is required to make it work? 

Before the gearbox went it use to run around 3000rpm a100kmh. Anything I can do to reduce this since I'm replacing the gearbox? I read a little on a dyna 5th gear.