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WHAT DIFF RATIO IS IN A GQ, 4.2LTR PETROL AUTO, 1990

General Tech Talk

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WHAT DIFF RATIO IS IN A GQ, 4.2LTR PETROL AUTO, 1990

Post by bucketofbolts »

just wanting to know without pulling it apart, what ratio is in my patrol, 4.2ltr petrol 1990 model auto,
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Post by 4wdnut »

3.9
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Post by bucketofbolts »

thanks mate,
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Post by CRUSHU »

Could also be 4.1

Check the tag in the engine bay, the first digits are the diff ratio from factory.
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..

Post by JemmyBubbles »

^^

What he said

It will say HG41 or HG39
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Post by bucketofbolts »

HG39, 3.9 ratio

i wondered what them codes where,

thanks guys
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Post by Vulcanised »

you wanna try 38" tyres on that diff ratio :armsup: it's an experience!! :D Driving back from the watagans yesterday with a head wind.... i think i averaged about 40 litres per 100 :armsup:
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Post by bucketofbolts »

yeah i bet, just chasing some 4.1's, at the moment
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Post by Vulcanised »

with the auto, i would go with 4.33 gears.

I'm biding my time and getting some 4.88's....... again :roll:
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Post by jessie928 »

you will find that its the maverick's that usually have the ratio's that are " exceptions to the rule"
if its a 4.2 patrol auto it should have 3.9's , manual 4.1's
maverick manuals have 3.9's and 4.1's
maverick auto's likewise.
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Post by bucketofbolts »

what does 37.9 mean, is it 37 devided by 9, = 4.11
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Post by jessie928 »

bucketofbolts wrote:what does 37.9 mean, is it 37 devided by 9, = 4.11
yes
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Post by bucketofbolts »

thats what i wanted to hear
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Post by CRUSHU »

My 89 TB42 auto Patrol was 3.9, my 93 TB42e auto Patrol was 4.1, friends 89 TB42 manual patrol was 3.9.
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Post by ST391GQ »

4.3 gears would be heaps better for your application as Patrolden said.
If you are lookin for those they are standard gears in a patrol fitted with RB30 (3 litre) petrol donk and manual gearbox.


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Post by bushy555 »

bucketofbolts wrote:yeah i bet, just chasing some 4.1's, at the moment
Got a pair of 4.1's from a 1998 GU TD42 going cheap if your interested...
They have 210,000 klicks on them. They came out when 4.6's went in.
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Post by bucketofbolts »

bushy555, jusy sent you a pm,
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Post by pongo »

bucketofbolts wrote:bushy555, jusy sent you a pm,
I have relos down that way and i need to go down before the end of feb. I can bring em to syd for beer money if you need ;)
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Post by bucketofbolts »

thanks, will keep that in mind,
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