DIFF RATIOS

Post by **AZZA'S HJ47** » Sat Feb 21, 2009 1:18 pm

hi all getting the hj47 closer to completion and at the moment thinking about diff gears will be running 33-35 tyres vehicle has a 5speed box and a 2h with a turbo main concern is that i dont want the engine to be doing a million rpm at 110k tell me what you running and what are the like

Post by **bj on roids** » Sat Feb 21, 2009 3:54 pm

33s and 35s fine on a 2H with turbo.

Low range gears in transfer case might be okay down the track.

Your engine will rev a little less on the highway, so it will be good for it.

Post by **Sixty's Guy** » Sat Feb 21, 2009 8:17 pm

I found the standard 4.11 diffs great for 33" tyres, 2H turbo & 5 speed. When I went to 35" I found that 5th gear was next to usless. I have now gone to 4.56 and that is ideal.

Post by **AZZA'S HJ47** » Sat Feb 21, 2009 9:16 pm

thats what i wanted to hear what kind of rpm are you doin at 110

Post by **Sixty's Guy** » Sun Feb 22, 2009 7:12 am

I'll have to get back to you on that one - the Cruiser is at the doctors at the moment.

According to my gear ratio calculator with 35z and 4.56 diffs I should be doing around 2550RPM as opposed to 2450RPM with 33z and 4.11 diffs.

Post by **bj on roids** » Mon Feb 23, 2009 6:16 am

Sixty's Guy wrote:I found the standard 4.11 diffs great for 33" tyres, 2H turbo & 5 speed. When I went to 35" I found that 5th gear was next to usless. I have now gone to 4.56 and that is ideal.

Mine was turbo with work done to it, and I found fifth gear fine.

But I know what you mean, becuase my 3B with 35s and 5 speed didn't like running in 5th gear.

Post by **bj on roids** » Mon Feb 23, 2009 6:18 am

I think some of the Mark's gearsets have 8% high range reduction too.

Post by **evanstaniland** » Thu Mar 19, 2009 5:50 pm

If i want to put 35s on my 100 would i need 4.56 to bring it back to standard?? i do alot of towing so i need it like standard!!

Evan

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