Diff ratio

MUS BUS 10 · newbie Joined: 21 Aug 2002 Posts: 2

Is it true that panel van (gypsy wagon!) diffs are a different ratio than the sedans? I know diesels are a 4.55 ratio but what are the vans? Cheers

ByteMe22 · backyard mechanic Joined: 28 Dec 2001 Posts: 591

i thought diesels were 3.55...

elky · petrol head Joined: 06 Oct 2001 Posts: 1149

maybe but i don't think so. I have the Geniune holden gemini parts book for the whole t series run. It says that there were 3 ratios, the diesel diff, the early model 8 bolt (3.89) and the later model 10 bolt (3.90) 8 bolts were only found on tx and tc gems
cheers

martin · backyard mechanic Joined: 04 Oct 2001 Posts: 900

so the different of a bee's dick between early and late model petrol models

Birko · tinkerer Joined: 03 Apr 2002 Posts: 180

Ive heard rumors that a diesel is a 4.11, howver there is no prove and nobody confirms it on this site. So ill stick with my holden book and say that it is 3.55

spud · petrol head Joined: 05 Apr 2002 Posts: 1106

i hearded the centres are the smae as some commodore diffs. any one able to confirm or deny that? and if it does work what ratios are available with them?
spud

GasGem · backyard mechanic Joined: 05 Nov 2001 Posts: 755

Early Diff 3.89:1 (8 bolt)
Petrol ALL Australian MODELS 3.90:1 (10 Bolt)

Diesel 3.55:1

Diff 10 Bolt is the same as commdores BUT the Pinion is different so you have to use a Gemini Crown and Pinion, thus keeping with the gemini ratio 3.9:1, but the LSD centre can be added.

as far as I know:
Piazza 3.55:1 LSD Solid disk brake version. with tourque tube.

ZZ/R & ZZ/T
unsure.
I assume they may have had the same as the Piazza,

Cheers
Eggy

gemivanman · rice boy Joined: 08 Oct 2001 Posts: 39

yes, the panal vans had a higher diff ratio. this was because it gave them a better take off when they had a load in them. i cant remember the ratio off the top of my head cause i read it a long time ago.

later

Trippo · rice boy Joined: 16 Aug 2002 Posts: 18

I'd say that that would be a typo! 4.55 - 3.55. Vans are different ratio, but stuff knows what.

GasGem · backyard mechanic Joined: 05 Nov 2001 Posts: 755

VAN's are same ratio as Petrol sedans,

and 3.5:1 would be a higher ratio and hard to get off the line.

ie. 1st would be like a 1st+1/2 gear and so on,

Ben Wight · backyard mechanic Joined: 04 Oct 2001 Posts: 946

Does anyone know if the diesel diff is the same salisbury unit as the petrol diff, just a different ratio? Or is the diff housing different aswell?

I am keen to get a 3.55:1 ratio, but keep my LSD centre.

Ben wight

Trippo · rice boy Joined: 16 Aug 2002 Posts: 18

3.55 - They set the speedo out 10Kms. Pretty good, its almost worthwhile having first gear! Good on the highway, a prick if you don't get the handbrake cable to suit!