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Diff gears for 37's on GQ
Diff gears for 37's on GQ
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
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
Re: Diff gears for 37's on GQ
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.
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.
Re: Diff gears for 37's on GQ
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
Mitchell bros motor sports in Brookvale and we ship anywhere
Regards
Brooksy
Mitchell bros motor sports in Brookvale and we ship anywhere
Regards
Brooksy
"If you are gonna live life on the edge u better have some good balance"
Re: Diff gears for 37's on GQ
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.
cheers.
save our freedom shoot a green
Re: Diff gears for 37's on GQ
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.
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.
Re: Diff gears for 37's on GQ
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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I am an insomniac dyslexic agnostic. I often lay awake all night wondering if there really is a Dog.
Re: Diff gears for 37's on GQ
Did you check your speedo with a GPS?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.
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 .
Re: Diff gears for 37's on GQ
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 outSIM79 wrote:Did you check your speedo with a GPS?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.
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.
2001 GU Patrol DX wagon, TD42, Air Lockers, twin spare carrier, Barrett HF, 35" Treps, high pinion rear, Staun beadlocks, 60l Engel and more!
Re: Diff gears for 37's on GQ
Ok thanks for the replies
Re: Diff gears for 37's on GQ
I have 4.8 in my gq and at 100km the speedo reads 98km that is on 37 treps
Re: Diff gears for 37's on GQ
Hi steve funny question your Patrol is it Blue/silver with some tricky suspension mods..?
Re: Diff gears for 37's on GQ
Hi nosdivad15
Yer the old patrol has a trick or two up it's sleve about 1200mm of flex from ground to tyre
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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