diff questions.

[mr sinbin]

If your WB was originally a 6cyl it probably has a 3.55 diff in it, possibly 3.36 if it was an auto. Putting a 3.08 will make it more sluggish. You won't find a small salisbury diff lower than 3.55. If you want to run 3.9:1 you can easily do that by finding a 6cyl HQ-HZ ute or van diff housing and coarse spline and fit that to your WB. Grab a LH-LX Sunbird or 4cyl Torana 3.9:1 diff centre for it and you are away. Tailshaft, brakes, U-bolts etc are all identical. Your best bet would be a HZ housing though as it'll have the RTS sway bar mounts on it. You can also fit a V8 diff into it (big 10-bolt) from a HQ-WB ute, can or tonner but these come in the same ratios, only one lower than the 3.55 is a 4.44. This too will fit straight in but will need tailshaft mods.

If it has the factory V6 memcal in it with a 3.55 or 3.08 diff the lock up torque converter and speed sensor (and cruise control) won't be working correctly. You need to get a memcal re-written with the right ppk (pulse per kM) constant for the tyre diameter and diff ratio. Things like idle when coating to lights etc can be affected.

thanks for all the info, and sorry it took me so long to reply, didnt even realise i had had an answer on this thread lol.

so you think that maybe the reason my van doesnt seem to be taking off as fast as the commodore use to is because of the memcal? do u know who i could ring or talk to, to find out weather this may be the case?

also ive had a few people tell me that the small ten bolt, originally in the van isnt really strong enough to take the power of the v6 and that i am better of replacing it with something stronger, what is your opinion on this?

i am also looking at buying a rear disk brake setup for the van just to help it stop a little better, but am unsure if i should just get axles, calipers, disks etc off another diff and fit them to mine, or upgrade the diff altogether with one that already has disk brakes.

sorry about asking even more questions, but i would rather get clarification from someone who knows there shit, then go in all gung ho and stuff something up.

cheers again

matt