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#1 | |
![]() Join Date: Oct 2019
Location: San Antonio, TX
Posts: 13
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Thanks so much for helping me start my research. I love learning more about these cars! I appreciate your efforts, my friend. Geoff '90 #2591 |
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#2 |
Join Date: Feb 2018
Location: owens valley
Posts: 25
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Pilot. Bushing mine did the same thing
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#3 |
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,843
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Take it to Crossed Flags Performance in Magnolia if your close enough. There are not many good ZR-1 shops around, he’s the closest to you.
https://www.crossedflagsllc.com/ Steve Schroeder knows what he’s doing on these cars. I agree with the pilot bushing theory based on what I’ve read. H ![]() |
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#4 |
![]() Join Date: Oct 2019
Location: San Antonio, TX
Posts: 13
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Old pro and ccmano, thank you for taking the time to respond. It's so great to have a forum like this available to a newbie, like me.
And, magnolia is only a few hours away. Next door, by texas standards. I will definitely look them up! Thanks again and take care out there! |
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#5 |
![]() Join Date: Oct 2019
Location: San Antonio, TX
Posts: 13
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Kenny,
Thanks for the input. I've already had the car to see Corey, but of course it wasn't making this sound when he did the initial once over for me. Corey is great, and I'll be reaching out to him first to get his thoughts. Really helpful, genuine guy. I would love to come out to the bbq! Where it's the best place to get info about it? Thanks again and take care. Geoff '90 #2591 |
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#6 | |
![]() ![]() Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,817
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__________________
Clickable links ![]() On Iphone Touchable Links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 11-25-2019 at 02:42 PM. |
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#7 |
![]() Join Date: Jun 2005
Location: CenCoast California
Posts: 898
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The change was made mid-year 1993, as I recall. Without trying to find some of my old S6-40 articles I can't say for sure. Graham remembers more about that change than I, so maybe he can confirm the time line.
The early S6-40s were designed when GM was still considering a turbocharged LT5 for the future and it wanted some extra torque capacity. After it became obvious there never would be an LT5TT, GM decided to address customer complaints about noise and decided to increase the helix angle as well as the other changes Graham details. The decision resulted in the later transmissions which were quieter and made less noise.
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Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878 |
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#8 |
![]() Join Date: Feb 2013
Location: New Concord Kentucky
Posts: 186
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The change made to helix angle as mentioned by Hib was a significant change to radiated gear mesh frequency because it increased contact ratio, ie the number of teeth in mesh. There are detail changes to tooth profile and flexibility that affect the load progression across the teeth and thereby reduce the noise generated as the gears mesh also.
Graham |
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#9 | |
![]() Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,153
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__________________
2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" |
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