What offset size rim will I need to use on a 4/6 drop

[sduckworth13]

I have read so many different combos, I'm now lost in what works great. What offset should I use if I want a 4/6 drop on my 1967 GMC 3/4. I have suspension from a 1974 Chevy 1/2 ton donor truck, I'm installing a 5 lug disc/drum setup. I'm doing a almost complete swap of the frontend except the crossmember and I'm going to use the rearend out of the 1974 Chevy 1/2 ton truck also. What drop kit gives the best ride and is a reasonably price kit. I know that the 1974 suspension is wider in front and back. What would be the best offset to use with 20 inch rims or 22 inch rims?

[lolife99]

What width wheels are you planning on using?
20x8?
20x9?
20x10?
Better yet,... which wheels exactly?
Most wheels only come is a few backspaces.

I recommend ECE's 4.5/6 drop.

[sduckworth13]

Keith, I'm needing advice on all the above. I don't know what width or size of rim that will be the best choice. I'm open to using any rim. I might have missed it, but I looked at ECE for a drop 4/6 for a 1974 Chevy Truck. I didn't see they carried it.
Thanks,
Scott

[SCOTI]

Originally Posted by sduckworth13

Keith, I'm needing advice on all the above. I don't know what width or size of rim that will be the best choice. I'm open to using any rim. I might have missed it, but I looked at ECE for a drop 4/6 for a 1974 Chevy Truck. I didn't see they carried it.
Thanks,
Scott

You'll need a 4/6 kit for a 67 w/leaf rear (assuming your 3/4 ton is leaf suspension) & a disc conversion. If it has coils, you want the 4/6 drop for 67 1/2 ton w/coil suspension.

For a staggered set-up, 20x8's up front w/4.5 to 5.25" back-spacing (I prefer 5-5.25" personally). Use a 255-40-20 (28" tall). 20x9.5's w/5.0" back spacing & a 275-45-20 or 20x10's 5/5.5" back spacing & 295-40-20's (29.3" tall).

[sduckworth13]

Even though I'm using a 1974 Chevy 1/2 ton suspension ( disc/ drum ), I still need to get a 4/6 drop for a 1967 w/ leafs? I don't have coils, leafs only.

[sduckworth13]

Thanks for the info on the drop kit and the wheels

[SCOTI]

Originally Posted by sduckworth13

Even though I'm using a 1974 Chevy 1/2 ton suspension ( disc/ drum ), I still need to get a 4/6 drop for a 1967 w/ leafs? I don't have coils, leafs only.

You just need to specify (clarify) that it's a 67 that was converted to disc brakes using 73-80 parts donor & the rear housing came from the same donor.

You'll need 73-80 dropped spindles & a drop coil for a 67-72.
The 67-72 rear leafs utilize different hangers, shackles, & narrower leafs (2.25" vs. 2.5"). You'll want a flip kit for the 67-72 year model. The 67-72 & 73-80 rear axle housings utilize the same OD axle tubes, they were just different lengths (67-70 shorter; 71-87 longer).

[sduckworth13]

cool, thanks for clearing that up, appreciate the help. Thats really helpful, now I might sound like I know what I'm doing when I buy the parts.
Thanks,
Scott

[SCOTI]

Is your plan to use the original leafs or the leafs from the donor?

[sduckworth13]

I'm going to use my original leafs for now, I was inform to do it that way. I had the guy I bought the rearend from cut off the 1974 Chevy donor truck leafs.

[sduckworth13]

I was wondering if I should do a flip kit of lower leafs on the rear, or is there a better option for my set up.

[SCOTI]

Originally Posted by sduckworth13

I was wondering if I should do a flip kit of lower leafs on the rear, or is there a better option for my set up.

For 6" drop? Flip kit.

[sduckworth13]

Ok, thank you.