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Diff gears for 37's on GQ

Tech Talk for Nissan owners.

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Posts: 27
Joined: Fri Aug 08, 2008 10:39 am
Location: Melbourne

Diff gears for 37's on GQ

Post by nosdivad15 »

Hi All

I have bought some 37's for my GQ TD4.2, Turbo/intercooled

Would 4.6 gears be the best ratio to run ?

Cheers in advance Cal
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Re: Diff gears for 37's on GQ

Post by 5inchgq »

Depends on what you intend to use the truck for.

Personally I went for 4.3's because I still have to run 33's daily, so it was a comprimise but 4.6's would be a better choice.
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Re: Diff gears for 37's on GQ

Post by unmass »

Hi there 4.6's will bring in particular a 35 inch tyre back to the stock 4.1 ratio on a TD42. This ratio would be a good compromise and allow you to run 35's on the road should the need arise. If your after some gears we stock 4.6's I work for

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Re: Diff gears for 37's on GQ

Post by outlawgq »

Depends on what you mainly use your rig for. If you do a fair bit of traveling & are going to run smaller tyres for this the 4.6's might wear there welcome out pretty quick. Then I'd go 4.3's & use reduction gears in the transfer to compensate the 37's when wheeling. If your going to run the 37's all the time opt for the 4.6's. 4.6's should near give stock rpm on 37's at 100klm/h maybe a little under. 4.5's suit 35' tyres but they don't make that ratio for a patrol so some opt for 4.625 others 4.375. Use a tyre ratio calc & put in the desired RPM at 100 klm/h along with the tyre diameter in mm, diff ratio & 5th gear ratio & it'll give you the speed for that combo at those revs so you can work out what suits you.

cheers.
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Re: Diff gears for 37's on GQ

Post by sidewayz »

As mentioned above,

if your not running the 37's all the time and have 33's or similar for daily duties, id look at reduction gears and leave the diffs how they are.
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Re: Diff gears for 37's on GQ

Post by Nelso »

I run 37's all the time and have 4.6 gears but I also have 85% reduction gears in the transfer. 4.6's are a good combination for me because of the transfer reduction offroad but 4.8 diff gears would be closer to standard ratios and would be a better choice if you have standard transfer gears. Mine is still about 10% over on the speedo.
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Re: Diff gears for 37's on GQ

Post by SIM79 »

Nelso wrote:I run 37's all the time and have 4.6 gears but I also have 85% reduction gears in the transfer. 4.6's are a good combination for me because of the transfer reduction offroad but 4.8 diff gears would be closer to standard ratios and would be a better choice if you have standard transfer gears. Mine is still about 10% over on the speedo.
Did you check your speedo with a GPS?

From what I have see 4.3 with 35s makes the speedo accurate when checked with GPS and I thought 4.6s with 37s was the same.
Nitto Mud Grapplers, Lockrite, 4.3s, Trail Ready BL, PTO, High pinion rear,Gu diff with Buds Customs armour and heaps of Superior gear, 24% Reduction .
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Re: Diff gears for 37's on GQ

Post by A.J. »

SIM79 wrote:
Nelso wrote:I run 37's all the time and have 4.6 gears but I also have 85% reduction gears in the transfer. 4.6's are a good combination for me because of the transfer reduction offroad but 4.8 diff gears would be closer to standard ratios and would be a better choice if you have standard transfer gears. Mine is still about 10% over on the speedo.
Did you check your speedo with a GPS?

From what I have see 4.3 with 35s makes the speedo accurate when checked with GPS and I thought 4.6s with 37s was the same.
You are correct, I have 4.3s and a brand new set of 35"s and the speedo is spot on. Checked with 2 GPS units, 100%, not even 1km/h out :armsup:
2001 GU Patrol DX wagon, TD42, Air Lockers, twin spare carrier, Barrett HF, 35" Treps, high pinion rear, Staun beadlocks, 60l Engel and more!
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Re: Diff gears for 37's on GQ

Post by nosdivad15 »

Ok thanks for the replies
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Re: Diff gears for 37's on GQ

Post by stevejl »

I have 4.8 in my gq and at 100km the speedo reads 98km that is on 37 treps
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Re: Diff gears for 37's on GQ

Post by nosdivad15 »

Hi steve funny question your Patrol is it Blue/silver with some tricky suspension mods..?
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Re: Diff gears for 37's on GQ

Post by stevejl »

Hi nosdivad15

Yer the old patrol has a trick or two up it's sleve about 1200mm of flex from ground to tyre
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