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[SMD]

Agreed. 3.45 with a petrol engine will be terrible - tractors only.

Also, remember that those graphs show theoretical speeds in gears. If the engine doesn't have enough grunt to get there it won't happen.

4.22 in a 3.2 auto is probably a worthwhile mod, as the auto is quite high geared. (mine is far from bogging down at 130, mind.. apparently) 

4.22 might be a bit much in a manual, as that is lower geared anyway, and the low gears in that gearbox are already pretty short, IMHO. IIRC, someone on here tried it (after a 2.6-3.2 conversion) and went for the 3.9 after trying it.

2.6 manual might benefit from a 4.22, but the auto already has it.

Thanks MV8 

Kevin, I'm guessing by your post you have a 4.22 diff. Is the difference noticable?

[bigtow]

i have fitted a 2.5 diesel diff to my 3.2 manual and it drives fine and i was getting 28-29 mpg out of it and a higher top end

[SMD]

Don't diesel diffs have different ratios than petrol and are tall geared for economy?

[Kevin Wood]

Agreed. 3.45 with a petrol engine will be terrible - tractors only.

Also, remember that those graphs show theoretical speeds in gears. If the engine doesn't have enough grunt to get there it won't happen.

4.22 in a 3.2 auto is probably a worthwhile mod, as the auto is quite high geared. (mine is far from bogging down at 130, mind.. apparently) 

4.22 might be a bit much in a manual, as that is lower geared anyway, and the low gears in that gearbox are already pretty short, IMHO. IIRC, someone on here tried it (after a 2.6-3.2 conversion) and went for the 3.9 after trying it.

2.6 manual might benefit from a 4.22, but the auto already has it.

Thanks MV8 

Kevin, I'm guessing by your post you have a 4.22 diff. Is the difference noticable?

Nope. I haven't done it to mine. Purely a speculative comment. IIRC Chrisgixer did it and was happy with the difference it made.

Then again, I once asked him what impact it had on fuel consumption and he gave me a funny look which told me he really didn't care much.

[RobG]

My 2.5 diff has a leaky pinion seal.I have a spare 3.0 diff (both auto cars) which I could bung in there rather than change the pinion seal.Problem is,I dont know what ratio aeither a 2.5 or 3.0 are.
Might be best to just change the seal I suppose.

4:22 for the 2.5,   3:90 for the 3.0.
And before you ask
http://www.omegaowners.com/forum/index.php?topic=90497.0

[albitz]

Cheers Rob.

2.5 is already sluggish.Im thinking the 3.90 diff would make it even more so.

[RobG]

Cheers Rob.

2.5 is already sluggish.Im thinking the 3.90 diff would make it even more so.

Go on a diet then fatty

[albitz]

Its the bloody car that needs to diet.Its half a ton overweight for the power output.

[RobG]

Its the bloody car that needs to diet.Its half a ton overweight for the power output.

Chuck that heavy LPG tank out then

[albitz]

But then I would need to fill the petrol tank which holds a lot more liquid than the LPG tank.

[cem_devecioglu]

Its the bloody car that needs to diet.Its half a ton overweight for the power output.

agreed