R154 question

[bsupra]

I have 1989 turbo and a 1991 turbo. Both has r154 transmission but I noticed that there is a 200rpm difference on all gears. I am crusing 50 mph 4th gear and my 89 is at 2250 rpm but my 91 is at 2450 rpm. Is there any difference between these two regarding about the years they were made?

 

[IJ.]

Diff ratio

 

[bsupra]

Diff ratio

Ahhhh. Ok. I did not know there were differences between the two based on transmission. Thanks

 

[Poodles]

They should both have the same ratio unless something was swapped...

 

[hvyman]

speedo wrong?

 

[Poodles]

very much a possibilty, verify with a GPS...

 

[IJ.]

20 year old performance car there's a good chance of a diff swap over the years.....

 

[Doward]

Sounds like hte '91 has a 3.91 vs the 3.73.

 

[bsupra]

Sounds like hte '91 has a 3.91 vs the 3.73.

So, did 89-92 supras had this changes on their differential?

 

[Doward]

Pre '89 Turbo 5 speeds had 3.91 diffs, post '89 Turbo 5 speeds had 3.73s from the factory.

 

[Supra-Man18]

373's ftw !!