3000 rpm is low for 100kph. But reducing torque further will increase fuel economy

Get one of these which bolt in:



It is H165 which came in these AUS models:
* A10 Stanza (1978-1981): 3.700 and 3.875
* 180B (610) wagon: 3.889:1
* Bluebird 910 sedan: 3.889:1 and 3.700 (wagons used H190)
* 200B (810) wagon 4.111 earliest versions before they switched to Borg Warner
* Series 3 Bluebird wagon (910): 3.889:1
* Bluebird series 1 (L20B engine)
* Bluebird series 2 (L20B engine)

Vanette
3.889 V.SB.LD20
4.111 LD20
4.375 V.A15
4.875 T.A15, Z20
4.625 A15
5.143 A12

Thanks for the info fellas, already got a five-speed gear box in my ute and it sites on about 3000rpm. I've got an A15 in it as well, wanting a LSD to get the power down better. I'll be a looking for a Series 1 or 2 bluebird diff then, are the a straight bolt in?

Hi Mate series 1/2 bluebird runs the same diff but in 3.7 3.9 depending on auto or manual

To reduce revs without losing power, you should be looking at a five-speed. About $1000 in AUS.

two reduce wheel spin with an A12, fit 205 tires and traction bars. Better than LSD.

The diff in my ute is on it's last legs, I am wanting to get an LSD with a different ratio so my ute isn't revving as much at 100 km/h. What should I be looking for? And what are the rough prices.