'72 Leafs to trailing arm conversions

[69gmcc10]

I think the '60-66 arms are the same, but I cant be 100% sure. I do know the lower spring mounts on that vintage are interchangeable with 67-72 and are sronger (double shear).

Read my thread: http://67-72chevytrucks.com/vboard/s...=501676&page=2. Starting at post #39 I did a coil conversion and it might have the info you are looking for.

It rides way better with the coils and with the trailing arm mount flipped it hooks up and puts the power to the ground real well!

[chevy72blu]

Thanks, I'll take a look!

Are there any differences between C10 and C20 frames with reference to the trailing arm setup? I was under the impression that they are the same, but a guy on Craigslist is adamant that they are not.

[SCOTI]

Originally Posted by chevy72blu

Any tips or pictures you can share would be helpful. Thanks

Obviously the most cost effective thing would be to find a pair of stock trailing arms, brackets, and spring perches. I could then use something like the CPP super track bar in lieu of a PHB. I've found a few sets of '60-66 arms. Are these the same dimensionally as the 67-72?

Yes they're the same. 3/4 ton arms are as well but they will have partial reinforcement plates on the top & bottom of the arms.

Other than cutting off and re-welding the spring perches, and torching out the factory rivets, what other fab work is involved? I assume I'll need to install new shock mounts, also.

Leaf frames do not have the same upper shock x-member as a coil equipped truck so upper mounts will be required. An alternative is No Limit Engineering's rear shock relocation kit. It changes where the shocks mount & provides better geometry. Check into their Panhard bar kit as well & compare vs ECE or CPP's set-up.

I may just rebuild my leafs with drop shackles and add a set of caltracs, but I've never really liked the way leaf springs ride compared to a coil spring '72 BBC truck I owned years ago...

Night & day difference of a swb 1/2 tons ride quality when comparing the leaf set-up vs coil in my opinion.

Are there any differences between C10 and C20 frames with reference to the trailing arm setup? I was under the impression that they are the same, but a guy on Craigslist is adamant that they are not.

69-72 2wd & 4wd Blazer/Burb frames are shaped different.
63-72 1/2 ton & 3/4 ton frames are shaped similar but I believe the C20 frames are thicker/taller (73-87 C20's are vs C10's).