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Registered
Join Date: Feb 2002
Location: Near Albuquerque, New Mexico
Posts: 1,076
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Changing gear ratios on a 915?
I find I am not happy with the 8\31 ratio on my newer tranny. I am used to the stump pulling power of my previous 901 with its 7\31 ratio.
How involved is the changeover (putting a new ring and pinion into the 915) once I have my tranny out? Costs?
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-Rickeolis- 1986 Corvette |
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07-23-2004, 09:48 AM
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Join Date: Jul 2000
Location: Daytona, Florida, USA
Posts: 549
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You might be able to buy a used one for what it would cost to rework what you have. Look for a 74 trans it should have a TL 5th gear that will help easy highway cruising RPM
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07-23-2004, 10:35 AM
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Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,467
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find a 76 912E trans which has an electric speedo, and use the complete 7:31 R+P and shims from it. it's a direct swap, no setup needed. be sure to get the drive flanges with it, as they are coarse splined and a 77 is fine splined. same outer flange shape/size.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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07-23-2004, 11:46 AM
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Join Date: Jun 2002
Location: Seattle- Eastside
Posts: 380
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I did what John said and it saved me money vs. having to source a spacer and shims etc etc. It's a very good upgrade, and as long as things are apart I'd swap in a taller 5th too.
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Bob Piper 78 911SC "Bullseye" SOLD 00 540i 02 CBR 954RR 98, 00, 03 sons |
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07-23-2004, 01:46 PM
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Excellent choice - my '86 3.2 screams through every gear! Great for track and autoX using 7.31 with stock trans gears.
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Mike - PBG, FL '14 958 Cayenne GTS '05 997 C2 - SOLD '79 911 SC Widebody PCA, NASA, PBOC - SOLD 2004 NASA-SE GTS4 Champ, 2005 + 2007 NASA-SE GTS3 |
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07-23-2004, 01:50 PM
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Join Date: Feb 2002
Location: Near Albuquerque, New Mexico
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Alright! Now I know what to do, thanks!
I'd use my 901, but I hear they have issues as they get close to 200+ horsepower. Noah, I did e-mail you, thanks!
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-Rickeolis- 1986 Corvette Last edited by rickeolis; 07-23-2004 at 02:16 PM.. |
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07-23-2004, 02:07 PM
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911 Widebody NASA GTS3 / PCA E
Mostly Street
