Looking at Rearends
Thread Starter
Le Mans Master
Joined: Apr 2002
Posts: 6,927
Likes: 3
From: Glendale NY
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18- '19
Looking at Rearends
I'm having some drivetrain work done in the near furture (I hope) transmission and clutch. While it's all apart, now is the time to consider a possible rearend change. O.K. here we go...the car is a 1998 6-speed, coupe with 70,000 mile on it. Usual bolt ons, Corsa exhaust, Air Filter, MAF Ends. I am considering 4.11's. Right now at 1500 RPM in 6th. gear I'm going 66 MPH. At 2000 RPM I'm gong 90 MPH. With the 4.11's what would be my RPM range at about 85 MPH? If it's between 2400-2600 I think I could live with that. Also, years ago you could change the speedometer gear to make the speedometer read correctly, I'm sure everything today is a sensor, is it possible to calibrate everything to read correctly? or, just live with the speedo being off a certain MPH. I Just Don't Know
Bob NY :confused:
Bob NY :confused:
Burning Brakes
Joined: Aug 2001
Posts: 1,206
Likes: 21
From: Roswell GA
Re: Looking at Rearends (vette#one)
The rpm change for a given speed is straight arithmatic.
4.10 / 3.42 * current rpm = future rpm. 2000 @ 90 now would be 2397 @90.
The speed sensor works where nothing changes for any of the gear options (3,73 3.90 4.10).
You are rigth - this is the best time - go for them.
[Modified by KingTut, 6:24 PM 1/5/2003]
4.10 / 3.42 * current rpm = future rpm. 2000 @ 90 now would be 2397 @90.
The speed sensor works where nothing changes for any of the gear options (3,73 3.90 4.10).
You are rigth - this is the best time - go for them.
[Modified by KingTut, 6:24 PM 1/5/2003]
Melting Slicks
Joined: Dec 2000
Posts: 2,204
Likes: 5
From: Bethlehem PA
St. Jude Donor '03-'05-'06-'08-'10
Re: Looking at Rearends (KingTut)
Just made the change from 3.73s to 4.10s on my '98 MN6. Don't give it a second thought with respect to RPMs, as the RPM increase is not worth worrying about. On the other hand, the performance increase is awesome, like somebody bolted on about 50-60 HP. The throttle response is there(!), when you want it!! Make the change man, you'll not regret it!!!
Good luck with your choices.
Joe
[Modified by C54FUN, 5:40 PM 1/5/2003]
Good luck with your choices.
Joe
[Modified by C54FUN, 5:40 PM 1/5/2003]
Thread Starter
Le Mans Master
Joined: Apr 2002
Posts: 6,927
Likes: 3
From: Glendale NY
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18- '19
Re: Looking at Rearends (KingTut)
King Tut
Thank you very much for answering my question. The members of this site have helped me greatly. This has been quite a learning process, and I love it.
BOB NY :flag
Thank you very much for answering my question. The members of this site have helped me greatly. This has been quite a learning process, and I love it.
BOB NY :flag
