[douglasgiersch]

Chasing the gear ratios on the 4spd box to suit 1l reason being I would like to find out if my current engine and gbox (4k) will have a higher or lower gear ratio in top gear and also first.
First it 5spd 4k box is 3.789:1
5th is 0.865:1 . Trying to determine my gearing needs to run 30s or close too 30 don't plan on going bigger On 1l nt diffs with 1l non switch case.
Doug

[mrw82]

4th gear is 1:1 can't remember 1st ratio but I'll check the book tomorrow arvo.

[douglasgiersch]

4th gear in the 4k 5spd box is 1:1 so putting it in 4th will have standard gearing just with a motor that has a few more ponies.
Using formula I found
Ratio 1 - ratio 2 = x
X over ratio 1 = percentage drop
So 1 - 0.865 = 0.135
0.135 over 1 = 0.135
So that's 13.5% increase ? Maybe wrong.

[sideways]

IIRC 1st is 3.163 in a 1l. You could just google it.

Yes, that's a 13.5% decrease in highway revs. 1ls do over 5000rpm at 110, a 4k wont live long doing those revs so it needs to be geared up.