Time to transition to lockable, single front diff?
Front diff showing 2757 ppm iron and 15 ppm chromium in January. Changed gearbox oils (Spirax-S) and resampled after 29,600 miles. Now has 1021 ppm iron and 5 ppm chromium.
Always had a mystery vibration in rear but never could get it out of this all Meritor driveline. Guessing I've got a worn gear since there were no obvious metal shavings, or pieces when I changed oil.
Heres my plan and looking for any helpful input:
1. Obtain front locking diff and send to MicroBlue for treatment. Haven't shopped yet but I'm first going to Jasper Engines to see what they have to offer. (Main office and plant is 8 miles away)
2. Gut rear axle, metal shop to fab plate with hub oil cap so I can do visual check of oil level. (I do not care for freeze plug idea because ability to monitor oil level is tough and if plug fails bearing failure will follow. I now this requires more syn oil but that is ok)
3. Plate rear of front axle housing with a fab plate to seal.
4. Volvo's seem to have a problem with rear driveshaft failures so by doing this I will also save on replacing this. (Betting it's expensive)
5.Extend front driveshaft and relocate carrier bearing if necessary.
6.Install a shutoff valve to isolate rear airbags in case of difficulties with terrain.
7.Dump valve for rear air bags.
8.Install MicroBlue drive bearings that I already have.
9.Save all old parts to easily convert back to 6x4 if this helps my trucks value later on. 675,000 miles now and plan to keep for 2 more years and maybe more.
I'm no mechanic but this is my plan. Welcome any helpful input.
Is this a worthwhile discussion?