1999 Patrol GU Y61 Diffs

[mudski]

Hi Mudski, I just rcvd my H233 diffs from superior engineering in QLD and they have 9 bolt holes ..... any ideas .... it would seem from your note they should have 11 bolt holes .....its such a confusing issue getting specs and really appreciate anything you can add.

Centre as in housing centre, not crown wheel. Sorry for the confusion.


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[Engism]

I will n get back to you ... other forums point to 9 bolt is pre 90 and 11 bolt post 90 .... mines 1999 but others say H233 is 11 only .... whats frustrating is I am in the very north of Thailand at the moment ... will get a mate to check the housing bolts
thks for your time
ian

Hi Again, .... I have been reading my questions and I may have been using the wrong terminology for my questions .... I actually need to know how many holes in the H233 crown gear as I am changing ratio's ... not complete centres. The crown gears I got have 8 holes.

[Engism]

I will n get back to you ... other forums point to 9 bolt is pre 90 and 11 bolt post 90 .... mines 1999 but others say H233 is 11 only .... whats frustrating is I am in the very north of Thailand at the moment ... will get a mate to check the housing bolts
thks for your time
ian

I think i have been led down the garden path by looking too deep ..... seems there are a differing number of mount bolt on the diff centres but all crown gears have 9 holes and it was the crown gear mounting holes i was in need of knowing.
Thx for your time and hopefully my theory is right but I have still to physically confirm it ... wish me luck.

[Engism]

OK .... I have fitted the 5.13 crown and pinion gears (Nitro) in place of my original 4.625 ratio,s in my Y61 RD28 with BFG All-Terrain T/A 265/70 R16 Tyres and couldn,t be happier with how the truck now performs. For anyone interested the speeds and revs now in 5th gear 2WD are as follows:
60 Kph (Gps) = 1800 rpm = 68 Kph on original speedo
70 Kph (Gps) = 2100 rpm = 80 Kph on original speedo
80 Kph (Gps) = 2400 rpm = 92 Kph on original speedo
90 Kph (Gps) = 2700 rpm = 103 Kph on original speedo
100 Kph (Gps) = 3000 rpm = 116 Kph on original speedo
110 Kph (Gps) = 3300 rpm = 128 Kph on original speedo
Now in 4WD Low the truck is a delight in the bush .... I also placed a stiff sponge under the throttle pedal after another posters suggestion to fix the sensitivity of the Fly By Wire throttle pedal system and it has completly stopped any of the normal sensitivity that caused the jerky throttle response in the rough .... over all the machine is exactly how I feel Nissan should have set it up from the factory ... very happy camper.

[MudRunnerTD]

OK .... I have fitted the 5.13 crown and pinion gears (Nitro) in place of my original 4.625 ratio,s in my Y61 RD28 with BFG All-Terrain T/A 265/70 R16 Tyres and couldn,t be happier with how the truck now performs. For anyone interested the speeds and revs now in 5th gear 2WD are as follows:
60 Kph (Gps) = 1800 rpm = 68 Kph on original speedo
70 Kph (Gps) = 2100 rpm = 80 Kph on original speedo
80 Kph (Gps) = 2400 rpm = 92 Kph on original speedo
90 Kph (Gps) = 2700 rpm = 103 Kph on original speedo
100 Kph (Gps) = 3000 rpm = 116 Kph on original speedo
110 Kph (Gps) = 3300 rpm = 128 Kph on original speedo
Now in 4WD Low the truck is a delight in the bush .... I also placed a stiff sponge under the throttle pedal after another posters suggestion to fix the sensitivity of the Fly By Wire throttle pedal system and it has completly stopped any of the normal sensitivity that caused the jerky throttle response in the rough .... over all the machine is exactly how I feel Nissan should have set it up from the factory ... very happy camper.

Awesome. Glad your happy with it. Where did you get those ratios? What did you do with your 4.6s?? You should have sourced some 3.9s cheap and swapped them and sold your complete 4.6s centres for good coin.

[MB]

Man......I’m a mechanical nuffy but honestly thought Nissan was slow arsed maxed at 4.6ers? Which country/variants had slower diif ratios like these torque monster coggs?
Must say Australian highway travelling behind great mates with their 4.6ers becomes tiresome at 100kmph. All that’s really needed I newly found was transfer case LR reduction gears for off-road stupidly steep slow stuff, still highway flying along.


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[mudski]

Awesome. Glad your happy with it. Where did you get those ratios? What did you do with your 4.6s?? You should have sourced some 3.9s cheap and swapped them and sold your complete 4.6s centres for good coin.

Superior Engineering sell them Daz. Also mate, unless im reading this wrong going 3.9's would be the totally opposite of what the op was wanting to achieve.

[MudRunnerTD]

Superior Engineering sell them Daz. Also mate, unless im reading this wrong going 3.9's would be the totally opposite of what the op was wanting to achieve.

Yeah you read it wrong. The 4.6s are worth coin in the carriers as complete 3rd members. Pull them out and sell them set up. Grab a set of 3.9s at a dime a dozen and strip them for the 5.1s into. you'd be at least $700 better off id reckon.

[mudski]

Yeah you read it wrong. The 4.6s are worth coin in the carriers as complete 3rd members. Pull them out and sell them set up. Grab a set of 3.9s at a dime a dozen and strip them for the 5.1s into. you'd be at least $700 better off id reckon.

Yeah after re reading it, that makes sense.