Quote:
Originally Posted by Bigdav160
Question for the group. The service manual list those two RPO axles as SERIES 20-30 5200 AND 7200 LB capacity axles. Then they list a Series 30 11,000 lb axle.
The 11,000 lb axles has the pinion supported by ball bearings instead of tapered bearings.
Am I to presume the H072 is the 11,000 lb and the H052 is the lesser?
The service manual also shows threaded holes for removing the axles in the 5,200-7,200 and a slide hammer necessary for the 11,000 axle shafts.
My original axle is long gone but the door tag list the GVRW as 7500lbs. This Suburban would have had a H052 or H072?
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Thought we were talking about pickup trucks, but here goes.
H052 5200lb axles were the standard axle for the C20 and K20 series trucks with a GVW of up to 7500lb. The HO72 7200lb axles were standard for the C30 trucks with GVW up to 9000lb on pickups and 10000lb as dual wheel chassis cabs. An optional axle the HO110 11000lb was offered on C30 dual rear wheel trucks with a 14000lb GVW rating (15x4 brakes and ten stud wheels).
On your 72 K20 Suburban, it could have had a maximun GVW of 6000, 6400, 7200 or 7500lb as built the left column. All would have stated maximum capabilty as 7500 in the right column. That means with the correct added springs and tires as required, any vehicle could be brought up to the 7500lb limit. This is charted in your driver's handbook and the chassis service manual.
Now the rear axle load limit is the variable here as the front axle limit at all GVW ratings for your K20 are 3300lb. That means your rear axle, depending on options and equipment, would be rated at 3900, 4700 or 5000lb. Now this is the maximum design weight on the rear axle, at the ground. All are well within the limits of the standard HO52 it would have been built with in most cases. Remember the GVW rating of your vehicle is less than the combined axle rating limits.
Overall there are some Dana 60 (5500lb) applications I am still trying to work out but generally they were big block four speed series 20 full floating applications and series 10 semi-floating applications.
Added a chart for those that want to poke into it.
To keep things clear the HO52/72/110 are described as banjo style axles. The Chevy 12-bolt and the Dana 60 are salisbury style axles.