Weird issue...do i have a different diff?

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Jan 24, 2013 | 01:37 PM

empera

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From: PA

Weird issue...do i have a different diff?

So i got my black sc300 about a year ago. I never really drove it much but when i finally took it on the highway i noticed my RPMs were around 4,000 @ 60-65 MPH.....it looks like it does shift through all 4 gears and OD is working (drops a gear when i hit the OD off).

This car was mistreated to begin with so i'd like to say that the differential may have been swapped with another.

Any ideas?

Jan 24, 2013 | 02:31 PM

10thMtnLex

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From: Colorado

I do not know of any OE Lexus rear gears shorter than the SC autos 4.27:1. Most would then lower the rpm, does the engine truely sound and behave as if it was turning that RPM?, or is there a chance the RPM signal is getting muffed, leading to the higher indication on the tach?? Hmmmm...

Jan 24, 2013 | 02:37 PM

iridebmx

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From: Colorado Springs, CO

thats about the same as a mk4 na supra with a w58.... nothing out of the ordinary

Jan 24, 2013 | 02:56 PM

empera

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From: PA

engine sounds and feels like the correct rpm. my white sc300 cruised at about 3k at that speed....

whats the diff ration on a n/a supra 5spd?

Jan 24, 2013 | 08:48 PM

3L4jzz31

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From: NorCal

Courtesy of SupraForum
NA 93.5-96 US spec---- 4.272:1

NA 97-98 US spec---- 4.083:1

EDIT:
Threw this in on second thought as well
92-00 Lexus SC300 auto---- 4.272:1

92-97 Lexus SC300 5spd---- 4.083:1

92-97 Lexus SC400 (auto)---- 3.916:1

98-00 Lexus SC400 (auto)---- 3.266:1

Last edited by 3L4jzz31; Jan 24, 2013 at 08:55 PM.