Aftermarket diff ratio for GX71

**gx71_chaser** · 26-11-2008, 03:51 AM

Car is coverted to 1JZ with R154.. Recently blew the standard diff and have decided on a TRD 2-way.

Is a daily driver. Would like to sit around 3300-3500rpm at 110

Anyone know the standard ratio off hand?

**Celica RA45** · 26-11-2008, 06:01 AM

either a 4.1 or 4.3 going by thoes revs

**CrUZida** · 26-11-2008, 01:06 PM

Being a G powered car any diff is likely.

Going by those revs and assuming stock tyres you are running around a 4.5-4.8 : 1 diff.

The plate on the firewall will tell you the factory diff, assuming its still in there.

Be careful ordering a new diff, as some GX71's had G series diffs, where as most had F series.

**gx71_chaser** · 27-11-2008, 07:50 PM

Ok thankyou.

Running low profile 15 inch tyres..

So just to make sure, 4.1 is going to give a higher speed at given revs compared to a 4.3?

**CrUZida** · 27-11-2008, 08:35 PM

Correct .

**gx71_chaser** · 28-11-2008, 09:06 PM

Hope this is the right code.

A42DL T292

?

**CrUZida** · 28-11-2008, 09:09 PM

T292

Povo spec T-series diff.

Stock ratio is 4.1:1

**gx71_chaser** · 30-11-2008, 03:34 PM

Is it worth looking for a centre, or should we be looking for a new housing?

**CrUZida** · 30-11-2008, 03:41 PM

Diff is really to small to put any decent amount of power through it.
But an F-series diff won't bolt up to your crossmember.

Try and source an F-series diff/crossmember from an MX73 Cressida and see if that bolts in.