aussie 4 speed

[mezzmo]

So last week i was looking at a 5 speed celica box, this week i want know if anyone has a highway diff (3.5) matched up to a 4 speed aussie box on a 173. any info? how does it rev? whats it sit at around 100k's etc etc

Thanks guys

Mezz

[Bas / NZ]

Yes have owned this set up too.
Well 186 and 4spd 3.5 rear end, didn't rev in top end, so good there, but I think it was a little under powered on take off, but this was a loooooooooooong time ago so could be wrong.
Think the 3.7 ratio would be better

[restoreid]

The original diff in mine was 3.70 at 100ks it was reving at 3800 put the 3.08 in & now revs at 2800 @ 100ks big difference crueses nice now

[mezzmo]

so how do reckon it would go with the original 3 speed?

[Bas / NZ]

The original diff in mine was 3.70 at 100ks it was reving at 3800 put the 3.08 in & now revs at 2800 @ 100ks big difference crueses nice now

But it must be slow on take off..? as I said it was a long time ago, so might have it wrong...

[Hobbit]

I'm still using the original 3 speed manual gearbox with a 3.5 diff. The ratio seems fine.
It's good on take off and sits at 100 - 110 kms okay, without excessive revs.

[Bas / NZ]

Yes, from what I can recall mine went well with the 4spd and 3.5 Cresta rear..

[mezzmo]

Thanks for the comments guy's, looks like i've bitten the bullet - got myself a fully reco'd 4 speed today - if it sits well on a 3 speed Hobbit, i can only assume she'll go a little better with a 4 speed - i'll let you know when she's on the road - whenever that is!!! 

[rumax]

Your trouble Messmo will be that the top gear is the same ratio: that is 1:1..... the sillycar 5 speed has an overdrive top, same as the v6 auto's, so @ 100k, your engine will be reving just as hard with the 4 speed. What will happen is you get an extra gear to get there, making it easier on the engine. Realise that @ 100 k, the difference between a 4.7 and 3.5 diff is nearly 25% (3700 rpm vrs 2700 rpm, depending on tyres.) I would be changing the diff as well... I even thought about getting 15 or 16" tyres as a solution to drop the revs. Have a look in the old posts as there is a lot of experience there and you don't have to re-inventing the wheel.

Cheers & good luck

Russell

[mezzmo]

Thanks Rumax, i am getting the diff checked this week to make sure it's ok - hopefully i wont be doing anything to it at this stage other than a clean up. What i thought was that i will get it set up with 3.5 and 4 speed and just see how she goes. if i'm unhappy then i'll get the centre changed - i'd rather do it that way than change the centre first (at a cost) be unhappy and then have change it again - also at a cost.

Thanks for the advice though - i will be keeping everything in mind.

cheers

Mezz