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915 Gears
Are 915 gears for 4th & 5th interchangeable?
Can I use a tall 4th for 5th gear or a short 5th for 4th gear?
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1985.5 944 GTS |
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10-28-2006, 04:44 PM
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Anyone?
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1985.5 944 GTS |
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10-29-2006, 05:13 AM
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Join Date: Feb 2003
Location: Kailua, Bend, & Tamarack
Posts: 1,618
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Only 3rd & 4th are interchangeable in the 915.
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10-29-2006, 07:26 AM
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Grand Am/IMSA Data Guy
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915 gears for 3 4 and 5 are the same. They use the same spline on the fixed gear and the same bearing on the rotating one. I just checked the tranny I have apart to be sure and 4th slides on the fifth pieces. Check out Carquip website: http://www.carquip.com/parts/911/trans/gears/915gears/3rdgear/index.asp and you'll see many of the 4th gear sets offered as fifth gear sets.
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Jerry Austin AIM Data Products Dealer 84 911 3.6 track car - Sold Morris Minor Van with S2000 running gear http://austinmotorsportsllc.com/ |
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10-29-2006, 03:49 PM
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Join Date: Feb 2003
Location: Kailua, Bend, & Tamarack
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I'd take another look. Your 915 5th fixed gear has an entirely different spline than 3rd & 4th fixed gears .... and last time I checked, the helix angle on 5th idlers is opposite that found on 3rd & 4th idlers.
Many low ratio 5ths have the same tooth counts as tall 4ths ... that doesn't mean they interchange. |
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10-30-2006, 06:29 AM
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Grand Am/IMSA Data Guy
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You are correct. I thought I had a 4th gear "SN" set and tried it on the tranny I have on the bench, but it turns out to be a fifth gear set. There are a few other differences so I stand corrected. Thanks, I learned something today.
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Jerry Austin AIM Data Products Dealer 84 911 3.6 track car - Sold Morris Minor Van with S2000 running gear http://austinmotorsportsllc.com/ |
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10-31-2006, 12:32 PM
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1984 Porsche 911 3.2
1984 Porsche 911 964 3.6
