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Join Date: Jul 2004
Location: Buena Park, Ca.
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All,
I am looking into low ratio diff's for a 79 930 4 Spd. I understand there was a popular one back in the 80's. It made the top speed drop from 165 to 145mph or so. It also made 2nd gear more useful at street corners I would not mind a ratio low enough to bring the top speed down to 135mph or so. What do these cost?. Does anyone have a good one in their garage. Thanks, Paul
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1970 911 (SLVR/BLK/SRD) 930 RSR in "Excellence" Sept 2007 (SOLD) 1983 911SC EURO (SOLD) |
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Andial use to make a 8:39 but is nla. There are a few other companies making them. I bought a new Andial one for $1450 last year and occasionally see used ones around $1000 and up.
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Harold '79 930/DP935 (sold) '68 VW 3.3 Turbo Crewcab |
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I thought the 8:31 was supposed to be real popular back then.
BTW.. Congrats on the Excellence article! Nice write-up and the car looks hot! Paul
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RGruppe #180 So many cars.. so little time!! |
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I've been running the Andial 8:39 for 5 years now and think they also had an 8:41.
The factory 4-speed at 6500 rpm in 4th gear is good for 189mph if you have the HP. With the 8:39 R&P it drops to 164mph.
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Lyall 82 930, 2500lbs 430hp Black, Black 85 944 ITS / SP2 racer 87 Carrera, stock, GP White, 03 Boxster S, GP White SOLD 73 De Tomaso Pantera, Grabber Blue 18 Alfa Romeo Giulia - Alfa Rosso Red |
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ive also been running the 8:39.i find 1st a little to short.but the rest of the gears i like.
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I was considering the upgrade.
Boy the car would be really quick Onboost, thanks for the Congrats! Ya, it's my 1st Porsche in Excellence. Imagine..it's in the September issue and we are in mid July. Glad you enjoyed the article. Hope to see everyone at the German Auto Fest. Paul
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1970 911 (SLVR/BLK/SRD) 930 RSR in "Excellence" Sept 2007 (SOLD) 1983 911SC EURO (SOLD) |
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Join Date: Feb 2004
Location: Olympic Peninsula
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You might consider changing the gear ratios rather than the diff. This runs around $750/gear. I lowered the 1st/2nd/3rd gear ratios around 20% and it made a big difference. I left 4th alone to have a highway cruising gear.
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