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post #1 of 3 (permalink) Old 10-05-2003, 07:21 PM Thread Starter
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another 5 speed changeover ??

l need some advise please, l have driven my 93 lx without o/d for 15000 miles, l did not want to push the car over 70mph @3000 rpm in 3rd gear, l have found a 89 s/c 5 speed transmission [changeover kit} what [approx] would my rpm be at 70 mph in 5th gear??? l am looking for better gas mileage, the car has a stock rear end [ax code 5] and 15in wheels thanks very much for any info.

Last edited by azbill; 10-05-2003 at 08:06 PM.
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post #2 of 3 (permalink) Old 10-06-2003, 01:20 AM
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The axle code of 5 shows to be an Open 3.27....

The ratios of the 1989 M5R2 manual....
1st Gear- 3.75
2nd Gear- 2.32
3rd Gear- 1.43
4th Gear- 1.00
5th Gear- .75
Reverse- 3.26

Your current AOD has...
1st Gear - 2.40
2nd Gear - 1.47
3rd Gear - 1.00
4th Gear - 0.67

I assumed a tire size of 215/70R15

With your current rear end gears you'll be turning between 2000-2500rpms in 5th gear at 70mph. You could throw in the rear pumpkin out of that 89 5speed car with its 2.73s and make a nice difference.

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post #3 of 3 (permalink) Old 10-06-2003, 03:24 AM Thread Starter
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very helpful,,thank you very much
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