Thread: diff upgrade options

Originally Posted by Bush65

The earlier rover diff had SAE Grade 5, 3/8" UNF bolts. Their strength (SAE Grade 5) is comparable to ISO Property Class 8.8.

With UNF bolts, SAE Grade 8 is readily available. I don't have my bolt hanbooks and Standards with me, so I can't confirm if Grade 8 is comparable to Class 10.9 or 12.9 and I don't want to go from memory.

However I do know that Grade 8 is the highest strength in any of the Standards for imperial bolts. Now Unbrako socket head cap screws are Class 12.9 and readily available, but the strongest bolts in the world (sorry can't remember the manufacturer, but I have a catalogue - not with me) as a stock line are called Grade 9 - these have the strength of Grade 9 if the Standards were to be extended to include such a high strength - so this make me think that Grade 8 is stronger than Class 10.9, but may be a bit less than Class 12.9

I do believe this is correct, yes.

JC

Originally Posted by Bush65

... so this make me think that Grade 8 is stronger than Class 10.9, but may be a bit less than Class 12.9

All the info I have shows 150000 psi (= 1034 MPa) tensile strength for Grade 8, and 1040 MPa for Class 10.9.

Grade 9, or bolts listed as "high strength grade 8" are listed as 170000 psi = 1172 MPa, so about the same as 1220 MPa listed for Class 12.9.

Probably one of the toughest housings built in Australia, can have built with Ford F350 parts. The current Dirtcomp magazine has an article on them as well.
Ruff Stuff Housing

Originally Posted by crash

Probably one of the toughest housings built in Australia, can have built with Ford F350 parts. The current Dirtcomp magazine has an article on them as well.
Ruff Stuff Housing

Ruffstuff is an all American company. I'm guessing dragtec are just importing. Ruffstuff have been working on a rover front housing for the Israeli military. I have suggested the sixty9 many times for a rear upgrade as the d60 and sals so close, you could make it a full rover drop in.

Originally Posted by uninformed

... I'm guessing dragtec are just importing. ...

given the text and images on this siteare identical... looks like you are right.
Axle Housings - RuffStuff Specialties

just had a flick through the dirtcomp mag. I saw the article and noticed they talk about housing thickness. The Ruffstuff axle tube is 3.5 inch and 3/8th thick, and they say compare this to a Nissan of 3mm thick and others as little as 1.6mm thick. BS! there is no way the axle tube on any solid alxe housing is 3mm or 1.6mm thick, yes the diff cover area maybe, but not the tubing which they are alluding to.

God I hate Journolism....