Lemme

Can't find this anywhere.

I am trying to determine what my diff ratio is. It is apparantly on this label as one of the Regular Production Options (RPOs).

turbodiesel

its in ur center column lid?

Lemme

If your talking about the centre console lid / compartment between the drivers and passenger seat then its definitely not there. Maybe its been removed!

rodj

Jack rear of car ,mark driveshaft ,rotate wheel one full turn ; count number of times DS turns
In '87 only have 2.59 and 3.07 ratios so not hard to work out which one

Lemme

So both rear wheels off the ground, transmission in neutral, park brake off. I am a bit worried the car will move without any brakes on. Is chocking the front wheels good enough?

Cadmaro

chocking the wheels should be fine. or you can set the cruise control at and note your speed and rpms and plug that in with your tire size in one of the 9 million gear ratio calcs on the internet. good excuse for a drive

Lemme

Thats not a bad idea either. Why didn't they just stamp it on the diff like other cars I know?

Pete K

Set the cruise at 70 MPH
If it turns 2000 rpm, it is 3:07 gears
If it turns about 1700 rpm's, it is 2:59 gears.

Except for the verts that had 2:77's, those were the only 2 gearsets available in a c4 auto car.

Lemme

Too easy!

Lemme

From my datalogging info for 60 mph my engine rpm is 2250. In 3rd gear (1:1) that tells me I have 2.73 final gears. Can anyone confirm that?

rodj

Correct ratio for a auto convertible / coupes got 2.59
Buy my 3.73 D44 ; that will wake your car up
Kill your top end speed some with a TPI but you aren't driving the
Nullarbor often?

Lemme

Lets get it organised.