1972 Coupe Normal Wheel Arch Height
Thread Starter
Instructor
Joined: Oct 2012
Posts: 222
Likes: 11
From: Johnston, Rhode Island
1972 Coupe Normal Wheel Arch Height
Hello,
A year ago my composite rear spring cracked and I replaced it with a new VBP 315 spring. I had them install the spring with the standard length leaf spring bolts I had purchased from another vendor. When I got the car home the rear wheel arch was about 28 1/2 to 29" above level ground. My front wheel arches are about 27" high. I have 225/70/15 tires on all 4 corners of my car. The two rear are new and the front two are about 1/2 worn. I bought 8" long bolts at VBP and took the car to a spring repair place this morning. However, I am not sure if the car is lower in front because the front coil springs are weak or if it is higher in the rear than it should be. What should be the height from level ground to the high point of the front and rear wheel arches using 225/70/15? Thank you.
A year ago my composite rear spring cracked and I replaced it with a new VBP 315 spring. I had them install the spring with the standard length leaf spring bolts I had purchased from another vendor. When I got the car home the rear wheel arch was about 28 1/2 to 29" above level ground. My front wheel arches are about 27" high. I have 225/70/15 tires on all 4 corners of my car. The two rear are new and the front two are about 1/2 worn. I bought 8" long bolts at VBP and took the car to a spring repair place this morning. However, I am not sure if the car is lower in front because the front coil springs are weak or if it is higher in the rear than it should be. What should be the height from level ground to the high point of the front and rear wheel arches using 225/70/15? Thank you.
Thread Starter
Instructor
Joined: Oct 2012
Posts: 222
Likes: 11
From: Johnston, Rhode Island
Well Well Height
Does anyone have a 1968-1972 with 225/70/15 tires all around? Can you check the height of the high point of the front and back wheel well arch to the ground? Thank you.
Melting Slicks
Joined: Mar 2006
Posts: 2,248
Likes: 67
From: Warrington PA
Finalist 2020 C4 of the Year - Unmodified
Hello,
A year ago my composite rear spring cracked and I replaced it with a new VBP 315 spring. I had them install the spring with the standard length leaf spring bolts I had purchased from another vendor. When I got the car home the rear wheel arch was about 28 1/2 to 29" above level ground. My front wheel arches are about 27" high. I have 225/70/15 tires on all 4 corners of my car. The two rear are new and the front two are about 1/2 worn. I bought 8" long bolts at VBP and took the car to a spring repair place this morning. However, I am not sure if the car is lower in front because the front coil springs are weak or if it is higher in the rear than it should be. What should be the height from level ground to the high point of the front and rear wheel arches using 225/70/15? Thank you.
A year ago my composite rear spring cracked and I replaced it with a new VBP 315 spring. I had them install the spring with the standard length leaf spring bolts I had purchased from another vendor. When I got the car home the rear wheel arch was about 28 1/2 to 29" above level ground. My front wheel arches are about 27" high. I have 225/70/15 tires on all 4 corners of my car. The two rear are new and the front two are about 1/2 worn. I bought 8" long bolts at VBP and took the car to a spring repair place this morning. However, I am not sure if the car is lower in front because the front coil springs are weak or if it is higher in the rear than it should be. What should be the height from level ground to the high point of the front and rear wheel arches using 225/70/15? Thank you.
Try to get your rear spring bolts adjusted for 27 1/2" and I think you will be happy with the results. Tom
Last edited by 74 LS4-454; Jun 13, 2015 at 06:06 PM.
Drifting
Joined: Sep 2014
Posts: 1,430
Likes: 59
From: Long beach NY
St. Jude Donor '15-'16, '18
Can't take measurements because tires no longer on car, but I have a pic, side view that will show what 225/70/15 looked like on front and back if that would help.
Melting Slicks
Joined: Nov 1999
Posts: 2,372
Likes: 227
From: N Cal
Hello,
A year ago my composite rear spring cracked and I replaced it with a new VBP 315 spring. I had them install the spring with the standard length leaf spring bolts I had purchased from another vendor. When I got the car home the rear wheel arch was about 28 1/2 to 29" above level ground. My front wheel arches are about 27" high. I have 225/70/15 tires on all 4 corners of my car. The two rear are new and the front two are about 1/2 worn. I bought 8" long bolts at VBP and took the car to a spring repair place this morning. However, I am not sure if the car is lower in front because the front coil springs are weak or if it is higher in the rear than it should be. What should be the height from level ground to the high point of the front and rear wheel arches using 225/70/15? Thank you.
A year ago my composite rear spring cracked and I replaced it with a new VBP 315 spring. I had them install the spring with the standard length leaf spring bolts I had purchased from another vendor. When I got the car home the rear wheel arch was about 28 1/2 to 29" above level ground. My front wheel arches are about 27" high. I have 225/70/15 tires on all 4 corners of my car. The two rear are new and the front two are about 1/2 worn. I bought 8" long bolts at VBP and took the car to a spring repair place this morning. However, I am not sure if the car is lower in front because the front coil springs are weak or if it is higher in the rear than it should be. What should be the height from level ground to the high point of the front and rear wheel arches using 225/70/15? Thank you.
Thread Starter
Instructor
Joined: Oct 2012
Posts: 222
Likes: 11
From: Johnston, Rhode Island
Lowering Rear Bolt Question
I have a service manual, but I cant find anything in there about the ride height. Does anyone know if I lower the back an 1" will the front rise an 1" as well or does it not work this way?
Melting Slicks
Joined: Mar 2006
Posts: 2,248
Likes: 67
From: Warrington PA
Finalist 2020 C4 of the Year - Unmodified
If you can take measurements of all 4 corners and post them. And pics would help too.
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Melting Slicks
Joined: Mar 2006
Posts: 2,248
Likes: 67
From: Warrington PA
Finalist 2020 C4 of the Year - Unmodified
On my 82, the LR is slightly lower than the RR, it's the nature of the beast. You could probably get the measurements correct, but after adjustments if you are a 1/2" difference from side-to-side, its no biggie!!!
Thread Starter
Instructor
Joined: Oct 2012
Posts: 222
Likes: 11
From: Johnston, Rhode Island
Rear Height
So if I have 225/70/15 which is 27.4" high versus 215/70/15 which is 27.1" high does that mean the height should be around 0.4" higher? I saw somewhere the rear height was 27.76" with the F70 x 15 tires so maybe the height should be around 28.2" with the 225/70/15. Does anyone think otherwise?
Melting Slicks
Joined: Nov 2005
Posts: 2,297
Likes: 156
From: Clayton New Jersey
I was having the same issue ..I have the 9 leaf metal rear spring. Mine was sitting at 31.5 with 6 inch bolts. As recommended by forum members, I replaced the 6 inch bolts with 8 inch. The lowest I can get is 29 inches. I can live with that. I'm also running the 225's. The front is 27.5. Front springs are also new. Good luck.
Melting Slicks
Joined: Mar 2006
Posts: 2,248
Likes: 67
From: Warrington PA
Finalist 2020 C4 of the Year - Unmodified
ride height is right on, hope the 74 will come out like that after completion....
Thread Starter
Instructor
Joined: Oct 2012
Posts: 222
Likes: 11
From: Johnston, Rhode Island
Thank you
The 225/70/15 tire is a little taller (27.4" vs 27.05") than the 255/60/15 so maybe the my car should be around 28" high in the rear. Thank you for replying and your car is really nice looking.
Safety Car
Joined: Apr 2006
Posts: 4,057
Likes: 421
From: BC
I think the GM factory ride height started to increase in 74 or maybe 73.