97 Q45 diff gear

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zinkie13
Posts: 548
Joined: Tue May 27, 2003 5:01 pm
Car: 1992 Lexus SC300 Single Turbo
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Does anyone here have any experience with changing the differential gear on a 97 Q to 4.083? If so, I'd like some feedback on what kind of results you had.

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Q45tech
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Posts: 14296
Joined: Tue Apr 30, 2002 3:19 am
Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl

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Again the 97 Q has a higher ratio [3.694 vs 3.538] so the impact is a little less noticable. The 10% higher revs per equal previous speed will reduce the gas mile an equal amount.Lots of work and cost for 0.2 seconds improvement. Finding and replacing the correct gear in the speedo sensor is an added challenge.
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