Hi all. Would like to know how the following GM service replacement parts will do in NCRS judging of a '63 coupe? Rear crossmember bushings(#9750078); Upper ball joints(#9762018); Lower ball joints(#9762019); Upper control arm bushings(? #401267 ?); Lower control arm bushings(#3714368); Outer tie rods(#3826814); Inter tie rods(#3826596). Thanks for your time. Jack
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Re: GM service replacement parts & NCRS judgin
Jack-----
I can't provide you with any information relative to the conformance with judging standards of the parts you mentioned. However, I can tell you something about the parts themselves:
GM# 9750078----CUSHION----This part is, as far as I can tell, identical in configuration to the original part supplied on 63+ Corvettes. Very little of the actual cushion is visible when mounted in the car.
GM# 9762018----UPPER BALL JOINT---This part is discontinued and replaced by part number 22156979. Both parts are identical save for the fact that the current part does not have a grease fitting installed. The 9762018 (and 22156979)ball joints are identical, except for one feature, to the ball joints installed in Corvettes as far back as 1965. I believe that they are identical to 1963 also, but I'm not certain. The one diffeernt feature is the size of the three holes for the rivets. Original joints have 1/4" holes for rivets; replacement joints have 5/16" holes for bolts. Joints with the 1/4" hole size have NEVER been available in service.
GM# 9762019----LOWER BALL JOINT----This part is also identcial to the original part as far back as at least 1965, and, I believe, 1963. Mounting holes accept the replacement 5/16" bolts, which are the same diameter as the original rivets.
GM# 401267----BUSHING, UPPER A ARM----This part is not the same as the original part which was discontinued from service in 1973. The original bushing had a rubber "collar" extending about 1/4" from the outer steel jacket on the INBOARD end of the bushing. On the 401267 bushing, the outer steel jacket extends to the end of the bushing. This feature can be discerned and, I believe, is judged. The original bushing is very hard to locate.
GM# 3714368----BUSHING, LOWER CONTROL ARM----This is the original part number and the original configuration used back to 1963. It has the rubber "collar" which I described above and is the best, easily available example of the configuration of the original upper bushing.
GM# 3826814----ROD, OUTER----This part number and configuration is original back to at least 1965. It may also be original to 1963. This part was still available the last I checked.
GM# 3826596----ROD, OUTER----This part number and configuration is also original to at least 1965 and may be original to 1963. It is discontinued and VERY HARD to locate.In Appreciation of John Hinckley -
Re: GM service replacement parts & NCRS judgin
Jack-----
I can't provide you with any information relative to the conformance with judging standards of the parts you mentioned. However, I can tell you something about the parts themselves:
GM# 9750078----CUSHION----This part is, as far as I can tell, identical in configuration to the original part supplied on 63+ Corvettes. Very little of the actual cushion is visible when mounted in the car.
GM# 9762018----UPPER BALL JOINT---This part is discontinued and replaced by part number 22156979. Both parts are identical save for the fact that the current part does not have a grease fitting installed. The 9762018 (and 22156979)ball joints are identical, except for one feature, to the ball joints installed in Corvettes as far back as 1965. I believe that they are identical to 1963 also, but I'm not certain. The one diffeernt feature is the size of the three holes for the rivets. Original joints have 1/4" holes for rivets; replacement joints have 5/16" holes for bolts. Joints with the 1/4" hole size have NEVER been available in service.
GM# 9762019----LOWER BALL JOINT----This part is also identcial to the original part as far back as at least 1965, and, I believe, 1963. Mounting holes accept the replacement 5/16" bolts, which are the same diameter as the original rivets.
GM# 401267----BUSHING, UPPER A ARM----This part is not the same as the original part which was discontinued from service in 1973. The original bushing had a rubber "collar" extending about 1/4" from the outer steel jacket on the INBOARD end of the bushing. On the 401267 bushing, the outer steel jacket extends to the end of the bushing. This feature can be discerned and, I believe, is judged. The original bushing is very hard to locate.
GM# 3714368----BUSHING, LOWER CONTROL ARM----This is the original part number and the original configuration used back to 1963. It has the rubber "collar" which I described above and is the best, easily available example of the configuration of the original upper bushing.
GM# 3826814----ROD, OUTER----This part number and configuration is original back to at least 1965. It may also be original to 1963. This part was still available the last I checked.
GM# 3826596----ROD, OUTER----This part number and configuration is also original to at least 1965 and may be original to 1963. It is discontinued and VERY HARD to locate.In Appreciation of John HinckleyComment
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Re: GM service replacement parts & NCRS judgin
In addition to the fine summary that Joe presented, I can only add the I have seen clever restorers modify the upper a-arm bushings to make them more closely resemble the originals by removing approx 3/16 inch of the metal collar, thus exposing the rubber.Comment
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Re: GM service replacement parts & NCRS judgin
In addition to the fine summary that Joe presented, I can only add the I have seen clever restorers modify the upper a-arm bushings to make them more closely resemble the originals by removing approx 3/16 inch of the metal collar, thus exposing the rubber.Comment
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Re: GM service replacement parts & NCRS judgin
I've actually been toying with the idea of adding 3/16" of rubber.TonyComment
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Re: GM service replacement parts & NCRS judgin
I've actually been toying with the idea of adding 3/16" of rubber.TonyComment
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Re: GM service replacement parts & NCRS judgin
True answer to your question is, "It depends"
Depends on whether you're at Chapter, Regional, National event.
Depends on who's on your chassis judging team, what he/she knows, and how much time pressure they're under.
Bottom line shouldn't be 'How will it do'. Top line should be how much pride/knowledge do you have and what is your objective....Comment
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Re: GM service replacement parts & NCRS judgin
True answer to your question is, "It depends"
Depends on whether you're at Chapter, Regional, National event.
Depends on who's on your chassis judging team, what he/she knows, and how much time pressure they're under.
Bottom line shouldn't be 'How will it do'. Top line should be how much pride/knowledge do you have and what is your objective....Comment
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Re: GM service replacement parts & NCRS judgin
Tony, if you look at the new one next to the lod one, I think you'll find the replacement has added the length to the steel. The rubber appears to be the same overall length as the original. A judge can see the extra length of steel when examining the upper a-arm.Comment
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Re: GM service replacement parts & NCRS judgin
Tony, if you look at the new one next to the lod one, I think you'll find the replacement has added the length to the steel. The rubber appears to be the same overall length as the original. A judge can see the extra length of steel when examining the upper a-arm.Comment
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Re: GM service replacement parts & NCRS judgin
Bill,
Would a Dremmel tool do the job of removing 3/16" or 1/4" of the metal sleeve? Do you suppose this job can be done while installed on the car? Anyone have any tips to successfully achieving the correct look?
Thanks, TonyTonyComment
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Re: GM service replacement parts & NCRS judgin
Bill,
Would a Dremmel tool do the job of removing 3/16" or 1/4" of the metal sleeve? Do you suppose this job can be done while installed on the car? Anyone have any tips to successfully achieving the correct look?
Thanks, TonyTonyComment
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Re: GM service replacement parts & NCRS judgin
Tony----
I think that it would be nearly impossible to try to modify the bushing while it's on the car. Also, bear in mind that even if you remove 3/16" or so from the end of the bushing it still won't look exactly like the original bushing. That's because the diameter of the rubber portion on the end of the original bushing was the same as the outer metal sleeve. If you remove some of the outer sleeve from one of the newer bushings, you will have a rubber diameter that is SMALLER than the metal sleeve. To illustrate what I'm talking about, check out the configuration of a new lower bushing. You will understand what I'm talking about.In Appreciation of John HinckleyComment
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Re: GM service replacement parts & NCRS judgin
Tony----
I think that it would be nearly impossible to try to modify the bushing while it's on the car. Also, bear in mind that even if you remove 3/16" or so from the end of the bushing it still won't look exactly like the original bushing. That's because the diameter of the rubber portion on the end of the original bushing was the same as the outer metal sleeve. If you remove some of the outer sleeve from one of the newer bushings, you will have a rubber diameter that is SMALLER than the metal sleeve. To illustrate what I'm talking about, check out the configuration of a new lower bushing. You will understand what I'm talking about.In Appreciation of John HinckleyComment
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