Re: Viva La GMC!
Posted: Sat Jan 03, 2015 11:17 pm
I have to admit I have been falling a bit short on the "weekly washes" routine. I'll... Hm, I may take her down to the car wash tomorrow. Maybe.
The big mechanical update fer now is the fact that I've finally gotten around to inspecting the axles that I have aquired not too long ago!
WOooohooo, gogo 6-lug / 12 bolt!
I had to chop out the cross member to be able to get the diff cover off.
Before we begin, this is a gem... Left rear drum, and I have to say, this is the most ruined drum I have seen thus far. That has not only exploded, someone also let it to sit forever and a day to get thoroughly rusted.
On the other hand I managed to make a nice chip into one of the rare front drums all by myself, as I was trying to PB/torch/hammer the drum off. I had a bit of a moment to say the least. I'm pretty sure that that an be balanced out though, so I'm not too worried to be honest.
The GM 12-bolt 8.875" rear differential, in all of its overexposed glory. One of the major objectives for cracking the diff cover to be able to see what the RPO was, as it could've been either 3.73 or 4.11
I counted the ring gear teeth which came out to 37. I didn't remember off the top of my head what the pinion was, and the ratio wasn't stamped into the ring gear either. With closer inspection I noticed that the pinion had "10 67 9 37" stamped into it. Huh. So this is likely the original 37:9 RPO, commonly known as 4.11:1
We'll see how much of an acceleration increase I will have once I hit the road with bigger tires compared to my current 3.06:1
Condition wise it's a good axle, the inside surfaces are clean and free of rust and the ring gear has only minor surface rust. I'll first clean the axle out and drive it around to see what it does, as this is another "not too concerned" item.
Between the clean inside and heavily corroded outside it's safe to say that the van it came out of - '68 G20 in Ohio, thanks for the sale MC! - has been a life-long East coast van.
Left axle shaft is in OK condition, it has some minor pitting on the outer edge. There isn't a deep grove per say, so it's not a dead axle. It'll definitely have to be replaced sometime eventually.
Right axle shaft is A-OK though.
These items actually had some good rust developing, had to scrape it off with some wood. They are the shims between the differential and the axle shaft gears. I have a feeling that all rust developed after the van has been parked, as this rust has not marked the differential or the axle shaft gears.
I'll be likely replacing these even though I scraped off the pertruding rust. I'd rather save a differential if I can help it.
The big mechanical update fer now is the fact that I've finally gotten around to inspecting the axles that I have aquired not too long ago!
WOooohooo, gogo 6-lug / 12 bolt!
I had to chop out the cross member to be able to get the diff cover off.
Before we begin, this is a gem... Left rear drum, and I have to say, this is the most ruined drum I have seen thus far. That has not only exploded, someone also let it to sit forever and a day to get thoroughly rusted.
On the other hand I managed to make a nice chip into one of the rare front drums all by myself, as I was trying to PB/torch/hammer the drum off. I had a bit of a moment to say the least. I'm pretty sure that that an be balanced out though, so I'm not too worried to be honest.
The GM 12-bolt 8.875" rear differential, in all of its overexposed glory. One of the major objectives for cracking the diff cover to be able to see what the RPO was, as it could've been either 3.73 or 4.11
I counted the ring gear teeth which came out to 37. I didn't remember off the top of my head what the pinion was, and the ratio wasn't stamped into the ring gear either. With closer inspection I noticed that the pinion had "10 67 9 37" stamped into it. Huh. So this is likely the original 37:9 RPO, commonly known as 4.11:1
We'll see how much of an acceleration increase I will have once I hit the road with bigger tires compared to my current 3.06:1
Condition wise it's a good axle, the inside surfaces are clean and free of rust and the ring gear has only minor surface rust. I'll first clean the axle out and drive it around to see what it does, as this is another "not too concerned" item.
Between the clean inside and heavily corroded outside it's safe to say that the van it came out of - '68 G20 in Ohio, thanks for the sale MC! - has been a life-long East coast van.
Left axle shaft is in OK condition, it has some minor pitting on the outer edge. There isn't a deep grove per say, so it's not a dead axle. It'll definitely have to be replaced sometime eventually.
Right axle shaft is A-OK though.
These items actually had some good rust developing, had to scrape it off with some wood. They are the shims between the differential and the axle shaft gears. I have a feeling that all rust developed after the van has been parked, as this rust has not marked the differential or the axle shaft gears.
I'll be likely replacing these even though I scraped off the pertruding rust. I'd rather save a differential if I can help it.