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Join Date: Mar 2008
Posts: 166
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915 Swap
Hello,
I have a 1974 mag case 915 and a 1980 alloy case 915. What is more advisable to do ? To put the LSD from the late 915 to early or, to swap the R&P from the ealry to late ??? Thanks! 
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Jim Wolf ------------------------------------------------------------------- "WHEN WE START RUNNING YOU BETTER CATCH UP" |
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06-23-2008, 03:40 PM
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Join Date: May 2003
Posts: 3,346
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My understanding is the mag case is better because it has a steel insert where the bearings are. The late LSD should fit in the early case and that would be my choice. The late RP should be an 8:31. Unless you want that gearing I'd keep your 7:31. If you have a high power engine you might want the 8:31 but you will lose your speedometer.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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06-24-2008, 04:14 PM
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Join Date: Feb 2008
Location: Phoenix Arizona
Posts: 166
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If you put the 7:31 r/p in the late alum case you end up with a "short" gearbox. 3rd, 4th and 5th gears on a late alum case are shorter because of the taller 8:31 r/p and by installing the earlier r/p you have a much shorter gearbox. The 7:31 r/p however is not as strong as the 8:31
aws |
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06-24-2008, 09:55 PM
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