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I have a 2002 GU and have just fitted a Chevy Optimizer 6.5lt V8 diesel from Brunswicks. Is there anyone in WA willing to swap my 4.3:1 F&R diffs (212,000kms) for their 4.1:1 diffs please? Mine are in excellent condition and I wish for the same in return. Cheers.
Damn. I have heard 3.9s are best suited. You should get good coin for the 4.3s and sghould get 4.1s cheap.
I have 3.9 N/A optimiser in GQ. - from @peeved Darren - ya big fat fingered goose! I know a guy who went as high as 3.7's and the 10% overdrive on the turbo, but basically was useless on the highway - could not pass anything without dropping down 2 cogs.
Hahaha bloody fat fingers and auto correct.Quote:
Originally Posted by PeeBee
no worries @Dirtwobbler
3.9 in mine when it was still the 5 speed but I think Brunny recommend the 4.1 in the 4L60 family of auto's.
Now that mine is also an auto I found it was a bit tall with 35's but 33's driven off the 4L85 works
Hey MudRunner TD, 3.9s are a bit tall for towing a caravan
4.3s currently in mine also after removing the 3.9s as they were too tall for our hilly highways here. I reckon 4.1s and reduction LR gears would be perfect too as the 4.3s are too low on the flat open 100km 5speed stock manual box driving 35s.
EDIT: Have thought about Marks 5th gear upgrade too that could work for leaving the 4.3s in there: https://www.marks4wd.com/mfk730.html
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IMHO if you run the standard 5 speed box...
3.9 for standard to 'small' 33's cruising
4.1 for 33's towing or lots of 4X... or... 35's cruising
4.3 for 35's if you want a tug.
Having said that everything is a compromise esp if the car is a daily or worker and depending on genuine tyre size IE some 'small' 33's are under 32 actual
MB, I also sussed out the 5th gear upgrade but was told that the rev gap between 4th and 5th was too great for towing a caravan and I would be constantly pulling it back to 4th, therefore eliminating the advantage.
6L80e for the win... point it, floor it. :1062:
Expensive tho :frown:
Wish I'd had the cabbage at the time but the 4L85e will just have to do for now while I dream about a Supercharged P400 / 6L80e
@poindexter mate, is it confirmed that a P400’s sump will fit in our GU’s at bump stop?
My new Bannana fibreglass bonnet should fit the charger well, lol :-)
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East-West Postage may be a bugger mate, although my 3.9s kindly swapped out by Patrol Apart - Victoria were I believe shipped back across to Brunswick possibly. Chat to the blokes there and here to see if some 4.1’s can make there next Nullabor pallet run.Quote:
Originally Posted by Rod Rocket
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Thanks MB,will ask