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Discussion in 'Original Drivetrain Topic' started by 70lt1z28, Mar 26, 2017.
Here's a couple from an NOS Gm set I have. Not sure when they were made. See next...
Here's a NOS GM set...not sure of production date.
Figured this was worthy of being stickied... see under "Various Original Drivetrain Stickies".
Hi Joe!....been a while bud. hope you, Karen and the girls are well.
We're all good Steve, thanks for asking. Hope you guys are doing well also.
PS I still have a pair of doors sitting here with your name on them.
I'm obsessed with coming to a CONCLUSION on what mfg (not any ole dealer)
can mfg the closest best fit best look 70 Z28 AND 70 L-78 rear leaf spring
WITHOUT all this re-arching baloney
Steve....I bought 21-297 springs from DAYTON (via www.SDtruckSprings.com)
to replace the springs in my 73 R/S LT (L65, T350)
The 21-297 is the spring that replaces the factory # 480879
Member JBloake wrote else where that he found the 21-285 to same as
3930074 ....70 Z28 spring ??????
Anyway my contact at DAYTON spring says he can make a very close
21-287 but currently has NO inventory
I'm trying to pull together all previous postings but not doing a good job...
Did anyone ever post anything accurately on the 70 L78 rear spring
or what did Scott K and Mike S buy from EATON
FWIW....I used the Eaton Z/28 leaf springs, but never had them modified in any way. I've never touched the front coil springs though and have had the car 20 years....I'm pretty sure they're the original 48 year old coils.
I think my cars slightly 'nose down' look is due to the front coils, not the rear leafs, and I believe Eatons springs are correct without de-arching. Check out the vintage Z/28 dealership photos below for comparison. They show a lot more clearance both front and rear above the tires than are on most of our restored Camaros.
Note: My car has over-sized tires in these pics, but tire size doesn't matter for the purpose of spring stance. The tires are the same size on all four corners.
How they looked when new
The problem was so bad that you could not hook up the brake line from the diff to body...That why the searching was necessary.
OK, today I took some time and found my original (02C-Norwood) springs. Took some pics of them. They are on my photosite. You can look through them and if you want wicked detail, use the link at the bottom of the page. It is ginormous!
Huh. The rubber in the spring mount is:
GENERAL TIRE B15153 5F-45 3892753
FlaJunkie, I also have ORIGINAL 70 Z28 springs that I bought from a local wrecked Z28
about 25 years ago.
What we need is to be able to compare what the Aftermarket is offering US
compared to the GM originals
I have the aftermarket SRI #'s that match the OE numbers
For reasons I cant explain DAYTON spring doesnt mfg the 21-285 which crosses
to the 3930074 2nd design 1970 Z28
DAYTON does mfg the 21-345 which crosses to a service replacement 480881
No one I know of is willing to buy this 21-345 from www.sdtrucksprings.com
and see if/how it fits their 70,71,72,73 Z28 !!!!!!!!!!!!!!
I still need to discuss/call EATON and DAYTON with the above info and come to my final conclusions.