911SC with short r/p 915

[Jim Schrager]

In my daily driver 1983 911SC I want to install a short r/p 1972 915 trans. Anyone ever done this? Does it make much difference in the way the car drives? Is it messy other than the speedo hook-up? Many thanks, Jim Schrager, South Bend, IN

[Bill Verburg]

Originally Posted by amoco911

In my daily driver 1983 911SC I want to install a short r/p 1972 915 trans. Anyone ever done this? Does it make much difference in the way the car drives? Is it messy other than the speedo hook-up? Many thanks, Jim Schrager, South Bend, IN

Yes, it makes a big difference in the character of the car. What are you trying to accomplish?

here's what you are looking at. The first is stock, the second is w/ a '72 trans. Normalized for the same tires and rev limit. the speed in gears and drops are the important things

[Jim Schrager]

Thanks for your post, I am trying to make the car feel "friskier" below 70 mph in daily use. I don't care about gas mileage. What I wonder is how big a deal it is to make it all work. Many thanks, Jim Schrager

[Steve@Rennsport]

Jim:

Given the issues with the early 915's ('72-'73), I would suggest that you simply re-gear that MUCH stronger SC 915 to suit.

Installing a custom stack of 2nd through 5th gears makes a much bigger difference than an R&P swap and you get the benefits of the later 915.

[Bill Verburg]

It'll be friskier allright

[Jim Schrager]

Thanks, Steve for your post. The mods you speak of sound great! What does something like that cost? Best regards, Jim Schrager

[johndglynn]

I have a shorter R&P in my C3, and if I were to do it again I would regear and use the stronger 8:35 instead of 7:31, just to do it once and be finished with it. Actually not so much if as when (pretty soon I would say). Makes a big difference to the car but you do notice the fuel costs. So what though, you're only here once