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Username Post: LEAF SPRINGS question..        (Topic#357215)
Posts: 5

Age: 57
Loc: Phoenix, Arizona
Reg: 11-07-12
07-13-19 06:21 PM - Post#2770632    

I have a '78 GMC Sierra 3/4-ton 4x4 that years ago I installed a ROUGH COUNTRY suspension on. Unfortunately, I threw out the old springs. I would like to put on stock springs again because I really don't like the lifted look anymore and it's getting harder to get in and out of.. Anyway, I found some springs from a '79 Chevy C30 Dually Cab, will these fit on my truck?
Thanks all!

1978 GMC Sierra25 3/4 ton 4x4 pickup (350-V8) and
1978 GMC Sierra Grande 1/2 ton pickup (350DX diesel)

Posts: 73

Loc: Arizona
Reg: 03-13-09
07-14-19 09:30 AM - Post#2770670    
    In response to hhelfenb2

I am dealing with leaf springs on my 74 K-10 with 3/4 ton suspension. I don't think those springs will do it on that 3/4 ton. You could take the springs you have and have them re-arked at about $70 each and take the lift out of them. As far as buying a new set here in Arizona you are looking a round $450. I have a 20 ton press. If I knew a little bit more about it I might try to re-ark my springs myself. So I'm looking for some information on the subject too.

Hold everything I misread Those springs should work with no problem.

Edited by badbob85037 on 07-14-19 09:36 AM. Reason for edit: No reason given.

Very Senior Member
Posts: 1865
Loc: Yo Mamaville, CA
Reg: 05-08-01
07-14-19 12:33 PM - Post#2770681    
    In response to badbob85037

Physically I'm pretty sure the leafs are only 2 sizes: 1/2 ton length and 3/4 or 1 ton.

So yes I'm pretty sure they'd fit. But the one ton has more leafs than the 3/4 ton, so youd still be riding a little high.

You can confirm this by measuring the distance from spring bolt to spring bolt.

But I'm pretty sure this is how it works if memory serves. Correct me if I'm wrong anyone.

1980 C20 -- If it fits in a compact parking space, IT AINT A TRUCK!
1959 4 door Impala -- "You bought your dad that car? it looks like the Batmobile"
1977 Chrysler Cordoba -- It's a Mopar, but it's a nice looking Mopar!

Senior Member
Posts: 1710

Loc: Whitewater, CO
Reg: 05-25-01
07-20-19 10:02 PM - Post#2771192    
    In response to roger_27

Might, might not.

As mentioned, measure the length.

The 1/2 ton and 3/4 ton were interchangeable...BUT, the 1/2 tons were 2 leaves and the 3/4 were often 3 leaves.

If it was 3 leaves, or more, and stiffer it would still work...somewhat.

You could also "fool" w/the pack and remove leaves.

That said, I bet there isn't a nickels worth of dif between them.

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