1979 3+3 GMC Dually

[SCOTI]

Originally Posted by Puglia10

Dang, no label in the glovebox. Ill see what I can find from the VIN. I'll need the paint code at least to paint the new fender.

What're you guys doing for highway speeds? I assume they all came with 4:10s? 60MPH is pretty high RPM....not great for around here when 80 is normal cruising speed. If I change the gears will it get out of its own way around town?

Ordered some interior parts I needed from Brothers. Of course the dash pad I really need is on backorder.

Next phone call will be for semi wheels and a drop....anyone to stay away from? I've heard good things about lowboy so far.

Lowboy is mainly bagged set-ups. I asked if he did an arm set-up that would work w/coils & he said "no, but it might be worth looking in to...". Not sure it is on his 'to-do' list but I'm betting no.

3" spindles & drop coil up front get's your 6" drop. The front x-member gusset bars will be creeping in close to the tarmac on decent size dips on the road w/the stock stuff that low.

Flip kit for the rear is 8" (+/- depending on the spring-pack count). At 8" drop you'll be bumpin' the bottom side of the bed floor w/the differential (they're porky).

Nothing should hang below the rails @ 6/8. They'll high center around town.

I think 4.10's is the most common for the HD rears. Mine does around 2800-3k @ 65-70 w/31.7" rear tires. Some guys will do 3.73's & there are also 3.54's available but like you mentioned it could impact the ability to get a load moving. I search C-list weekly for a 4l80e.