C3 corvette solid rear NHRA leaga questions

corvette john · 03-10-2013, 07:53 PM

i dont want a toms diff, lets just get that out first. yes they work but that isnt what i want.

i am looking for info on the approved way of mounting the factory trailing arms to a solid rear and if there is a top mount used or allowed. i am not going to be running in stock and the ET im after the toms stuff wont live but i still need stock rear suspention. i can do the work myself as i have the use of a chassis shop.

i have read to page 60 in this forum looking for info and i have only found one post for a C4 corvette, that tech director's name that was named i will search out to see if he might have insite on the C3 cars as well.

thanks for any help you can offer.
corvette john

Chad Rhodes · 03-10-2013, 08:57 PM

have you seen how fast some Tom's equipped cars have gone?

Rory Christianson · 03-10-2013, 09:13 PM

If your not running stock you could just put a 4 link with coil overs or ladder bars with coil overs and get rid of the transverse
The factory trailing arms are not the strongest either
There are a few aftermarket trailing arms out there that are nice, Global west for one if you are going to stick to trailing arms

If you trying to run something legal in stock then that's different
I am just building a stock legal diff for my now
A few people on this site were nice enough to show me what they had done in building a stock legal one

Tom Turner · 03-10-2013, 10:54 PM

Contact Alf Wiebe. If he will make trailing arms and spring seats for you THAT is the way to go. He built my C-3 (Fred) complete but the trailing arms and the spring setup is the tricky part.

jmcarter · 03-11-2013, 05:46 AM

Don't know where you live but Jimmy Parker has set up a lot of fast vettes down here in the south. He's on the forum.

Terry Cain · 03-11-2013, 09:40 AM

Quote:

Originally Posted by corvette john

i dont want a toms diff, lets just get that out first. yes they work but that isnt what i want.

i am looking for info on the approved way of mounting the factory trailing arms to a solid rear and if there is a top mount used or allowed. i am not going to be running in stock and the ET im after the toms stuff wont live but i still need stock rear suspention. i can do the work myself as i have the use of a chassis shop.

i have read to page 60 in this forum looking for info and i have only found one post for a C4 corvette, that tech director's name that was named i will search out to see if he might have insite on the C3 cars as well.

thanks for any help you can offer.
corvette john

John,
Email me. I might be able to answer a few of your questions.

tj310 · 03-11-2013, 09:59 AM

If your not running stock why do you care about their rules ? If your running with a different group I'd get in touch with them directly , try to get them to put it on paper, or did they tell you whatever ?HRA allows ?
It's my understanding you have to use a transverse rear leaf spring . No heim joints on the lower arms and your supposed to use the stock frame mounting points. When you make your new control arms they have to be "accepted"
---Trevor

Bob Pagano · 03-11-2013, 11:31 AM

Alf dose not make trailing arms for corvette anymore, I got the last set.

03-10-2013, 07:53 PM	#1
corvette john Junior Member Join Date: Mar 2013 Posts: 1 Likes: 0 Liked 0 Times in 0 Posts	C3 corvette solid rear NHRA leaga questions i dont want a toms diff, lets just get that out first. yes they work but that isnt what i want. i am looking for info on the approved way of mounting the factory trailing arms to a solid rear and if there is a top mount used or allowed. i am not going to be running in stock and the ET im after the toms stuff wont live but i still need stock rear suspention. i can do the work myself as i have the use of a chassis shop. i have read to page 60 in this forum looking for info and i have only found one post for a C4 corvette, that tech director's name that was named i will search out to see if he might have insite on the C3 cars as well. thanks for any help you can offer. corvette john

03-10-2013, 08:57 PM	#2
Chad Rhodes VIP Member Join Date: Jan 2005 Location: Where the Green Grass Grows, AL Posts: 2,375 Likes: 0 Liked 3 Times in 3 Posts	Re: C3 corvette solid rear NHRA leaga questions have you seen how fast some Tom's equipped cars have gone? __________________ Chad Rhodes 2113 I/SA

03-10-2013, 09:13 PM	#3
Rory Christianson Member Join Date: May 2005 Location: canada Posts: 128 Likes: 3 Liked 9 Times in 6 Posts	Re: C3 corvette solid rear NHRA leaga questions If your not running stock you could just put a 4 link with coil overs or ladder bars with coil overs and get rid of the transverse The factory trailing arms are not the strongest either There are a few aftermarket trailing arms out there that are nice, Global west for one if you are going to stick to trailing arms If you trying to run something legal in stock then that's different I am just building a stock legal diff for my now A few people on this site were nice enough to show me what they had done in building a stock legal one

03-10-2013, 10:54 PM	#4
Tom Turner Member Join Date: Jan 2005 Location: Lake Tapps, Washington Posts: 137 Likes: 0 Liked 0 Times in 0 Posts	Re: C3 corvette solid rear NHRA leaga questions Contact Alf Wiebe. If he will make trailing arms and spring seats for you THAT is the way to go. He built my C-3 (Fred) complete but the trailing arms and the spring setup is the tricky part.

03-11-2013, 05:46 AM	#5
jmcarter VIP Member Join Date: Dec 2008 Location: Richmond Hill GA (and Port Ludlow WA) Posts: 4,297 Likes: 2,383 Liked 3,184 Times in 973 Posts	Re: C3 corvette solid rear NHRA leaga questions Don't know where you live but Jimmy Parker has set up a lot of fast vettes down here in the south. He's on the forum. __________________ Jim Carter 2340 Super Stock 2340 SST/2340 Stock Set another place at the table

03-11-2013, 09:59 AM	#7
tj310 Member Join Date: Sep 2009 Location: Dresden On. Canada Posts: 460 Likes: 0 Liked 0 Times in 0 Posts	Re: C3 corvette solid rear NHRA leaga questions If your not running stock why do you care about their rules ? If your running with a different group I'd get in touch with them directly , try to get them to put it on paper, or did they tell you whatever ?HRA allows ? It's my understanding you have to use a transverse rear leaf spring . No heim joints on the lower arms and your supposed to use the stock frame mounting points. When you make your new control arms they have to be "accepted" ---Trevor

03-11-2013, 11:31 AM	#8
Bob Pagano VIP Member Join Date: Jun 2002 Location: New Holland, PA Mooresville,NC Posts: 1,163 Likes: 241 Liked 16 Times in 11 Posts	Re: C3 corvette solid rear NHRA leaga questions Alf dose not make trailing arms for corvette anymore, I got the last set. __________________ Bob Pagano A/SA