Stock C3500 Rear Leafs on a C2500

[GMCTruck]

sample from the web

 

[Schurkey]

Which brake RPO code do you have? JB7 or JB8 (if vacuum boost) or JD7 or JD8 (if hydroboost)
JB7/JD7 = 8400 lbs
JB8/JD8 = 10,000 lbs

I imagine, since you have the 10.5 full float rear axle, it is JB8 or JD8. That would be good.

My '97 K2500 7.4L has the 10.5 full-float axle, but 8400 lb. GVW and JD7 brakes.

 

[stutaeng]

My '97 K2500 7.4L has the 10.5 full-float axle, but 8400 lb. GVW and JD7 brakes.

GVWR 8600#? I've never seen a model with 8400#.

 

[Schurkey]

GVWR 8600#? I've never seen a model with 8400#.

OK, 8600. Not the 10K listed in the earlier post.

 

[stutaeng]

My K3500 CCLB SRW leaf springs look the same as what the OP posted. Unless they look the same but are different spring rate? I don't know. That's why I was wondering if his truck was 9200#.

If they are, then the dually springs with the arched overload above the regular spring pack is what I would look for at the junk yard. The one @GMCTruck posted.

That's a mod I've been wanted to do to my truck to help with sag....although in that photo OP posted the rear doesn't look too bad if the camper actually weighs 3,500#.

 

[GMCTruck]

GVWR 8600#? I've never seen a model with 8400#.

I think the 8400 lbs number comes from the earlier squarebody ratings for the C/K20. GM simply forgot to change the rating to 8600 later on.

 

[GMCTruck]

That's a mod I've been wanted to do to my truck to help with sag....although in that photo OP posted the rear doesn't look too bad if the camper actually weighs 3,500#.

That's what i thought too. I would expect a 3500 pound camper to squat the rear end more.

 

[stutaeng]

I did a yard of flex base on my 3500 today, it levels it pretty good. It's around 2700-2800 lb/yard. Sand is about the same, depending on moisture content.

I've done a pallet of 42 bags of 80 concrete baggaged mix on mine, and that puts the rear axle about 1" from the bump stops. I "think" that pretty much nets my 9200 lbs. Old girl sags pretty good.

I've kinda estimated that number when taking busted rock to the landfill. I get weighed when I go in. I've been right on the number a few times. Stopping distance is extended for sure at that payload. My truck has the JB8 brake code, whatever that means?

3500 lbs is a good amount of weight.

 

[Schurkey]

My truck has the JB8 brake code, whatever that means?

My '97 service manual says JB8 varies between single-rear wheel and dual-rear-wheel vehicles. Both rear brakes are 13" drums x 3 1/2" shoes. The front brakes are different--12 1/2" rotors 1.26 thick on single-rear-wheel vehicles, 12 1/2" rotors 1.5" thick on dualies.

 

[Westieterrier]

sample from the web

Unfortunately, I have the JB7 brakes. I must say that it stops just fine with the camper. You've been super helpful GMCTruck!