What can I do to a 2.78?

[vkwalks39]

Hi guys, I just brought myself a V8 diff. I was told that it was a 3.08, but, when i got it home my ol' man told me it's a 2.78! So what can i do to it? It's going into my good body (VK). One day it's going to be a show/drag car.I only pay $85.00 for the diff.

[SL/ENUT]

Do you mean its a 10 Bolt Sals or an 8 bolt Sals?.

I suppose you could use it, good for fuel economy if anything!. You could sell it as well.

[vkwalks39]

I don't know, mate, it was in a vk then the guy put a vl diff in his vk. That all i know. How can i tell if is a 10 bolt? It has disc brakes on it.

[SL/ENUT]

The diff cover, egged shaped its a 10 bolt, rounded shape, 8 bolt.

[vkwalks39]

The plate out the back is rounded. BUGGER!! Do you know how much power can they take? Rough i dear pls mate.And, i would like to put in lsd into the diff. My commodore book say, the diff is out of a vb s/le.

[SL/ENUT]

With a 308 behind it, not to long. Even with LSD, it won't last that long. Its only really designed for 202/low torque 253s.

2.78 diffs are usually behind 202/253 Trimatic Commodores.

[DANNY8]

Yeah 8 bolt's are pretty cruddy....in both our manual cars we blew 2 each, then both put a borgy in and haven't looked back.

[vkwalks39]

Thanks guys. The motor I'm going with is a 304 efi, the aim is to have 550hp. Maybe if talk to diff specialists, may be they can help, hey! I do have another vk but that has a 6's in it.

[jd hot stuff]

Hey guy's just asking which ratio is a 10 bolt sals. The plate under the bonnet say's ive got a 2:78 diff (gu7), so im just asking if that is right, it is also disc brake.

Cheers from justin

[vkwalks39]

G'day, where your tailshaft connects to the diff. Just have a look around the plate where's the front bit of th diff. It should be stamped on there. You will need a wire brush to clean it then you will see what ratio it is.

[jd hot stuff]

ok thanks for that mate ill look when i get a chance

[jd hot stuff]

Hey guys does anybody no what this number means on the diff j7h4 or it could b i7h4 it is very hard 2 see