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Posted: Thu May 07, 2009 9:37 am
by jessie928
maverick01 wrote:I have a GQ on 35s with 4.11 diff gears and i was informed by a guy in the comp scene to put 4.88 diff gears in
Is that too much just for 35s
4.6's are the correct ratio for you if you are running 5 speed manual and 35's.
Posted: Thu May 07, 2009 9:41 am
by jessie928
GUEEY wrote:I had 4.3 in my TD42T wagon and they were spot on.
Speedo was within 1 Kph on the GPS.
Thank god i didnt go with 4.6 as most poeple surggested, my truck would of been over geared on the hwy & revin its arse off.
Maybe 4.6 from 3.9s are ok is you have a comp truck or a weekend warrior only.
I run was Runing 35 claws.
Cheers
Grant.
you can get away with 4.3's on some trucks that originally had 4.1's.
BUT, if you chucked the GPS on before you put 35's on you will find the speedo was out a fair bit also.
Jes
Posted: Thu May 07, 2009 10:34 am
by hulsty
benhl wrote:I can't believe this thread!!! It's pretty simple really, as Jet 6 i think said above.... you need to check what you already have first.
Most GU utes will have 4.1's std and
most GU 4.2L wagons 3.9's. You can check this on your compliance plate XXXXXX41HG or 39HG something like that anyway.
Once you have done that, for 35's go two ratios up. Crude method i know but also as said above it works for GU Patrols (to within 1 or 2 km/h) anyway. So... for utes with 4.1's std - go 4.6's for close to std gearing on 35's and for wagons with 3.9's std - go 4.3's for close to std gearing on 35's. Again for 37's, since it's another tyre size up from std - go another ratio up.... 4.88's and 4.6's respectively.
This could be a different story for
drivability however, with many people above using 4.3's on the utes with power ups etc that's personal preference. I've got 4.3's from std 3.9's in a wagon with power ups and find it good to daily drive and good in low range and towing is fine too. But it personal preference...
Hope that helps
Do patrol utes/wagons have different gearbox/transfer case ratios dependant on the final drive ratio?
You mention maintaining stock gearing on a wagon with 3.9 and a ute with 4.1 stock and going upto a different ratio 4.3 or 4.6. Or are utes just geared lower overall vai the diff due to the extra loads on the vehicle?
So a GU 4.2TD 5spd ute and wagon both with 35''s with the same diff gears say 4.3 would be turning at the same rpm at 100kmph? But to maintain stock gearing the ute would need to run 4.6 gears?
Posted: Thu May 07, 2009 6:14 pm
by A.J.
I have a TD42 GU wagon and I have 4.1s as standard. I don't know where the 3.9 myth comes from. I think the autos have 3.9s but there is no TD42 factory auto in a GU.
Posted: Thu Mar 18, 2010 5:20 pm
by tanz-e
could someone please explain the meanings behind each number for me?.
4.9=?
Posted: Thu Mar 18, 2010 7:52 pm
by dano80
A.J. wrote:I have a TD42 GU wagon and I have 4.1s as standard. I don't know where the 3.9 myth comes from. I think the autos have 3.9s but there is no TD42 factory auto in a GU.
Didn't the petty ones come out with 3.9's?
Cheers, Dano.
Posted: Thu Mar 18, 2010 10:06 pm
by turbo gu
dano80 wrote:A.J. wrote:I have a TD42 GU wagon and I have 4.1s as standard. I don't know where the 3.9 myth comes from. I think the autos have 3.9s but there is no TD42 factory auto in a GU.
Didn't the petty ones come out with 3.9's?
Cheers, Dano.
non turbo 4.2 gu had 4.1!
turbo 4.2 has 3.9 in wagons
Posted: Fri Mar 19, 2010 9:33 am
by bogged
A.J. wrote:but there is no TD42 factory auto in a GU.
... yes there is, just not in Australia
Posted: Fri Mar 19, 2010 11:47 am
by thehanko
tanz-e wrote:could someone please explain the meanings behind each number for me?.
4.9=?
4.9 would mean 4.9:1 but has been abbreviated.
its the ratio in the diff, i.e the number of turns the drive shaft will do per 1 revolution of the tyre.
3.9 will mean the drive shaft turns 3.9 times to 1 full revolution of your wheels.
4.1 is 4.1 times per 1 revolution of wheel etc.
Posted: Fri Mar 19, 2010 1:31 pm
by twodiffs
I swap tyres regularly between work and every day use and work purposes.
I don't want to run my good 35's permanently therefore i'm putting 4.3's in and turbo soon. I think that will be a good mixture.
I think with 4.625 or 4.88's you need to run 35's permanently.
Posted: Fri Mar 19, 2010 1:43 pm
by tanz-e
thehanko wrote:tanz-e wrote:could someone please explain the meanings behind each number for me?.
4.9=?
4.9 would mean 4.9:1 but has been abbreviated.
its the ratio in the diff, i.e the number of turns the drive shaft will do per 1 revolution of the tyre.
3.9 will mean the drive shaft turns 3.9 times to 1 full revolution of your wheels.
4.1 is 4.1 times per 1 revolution of wheel etc.
thanks mate... its just, im runnen 35's at the moment permenantly. its not to bad. the sluggishness of it doesnt bother me that much. however im yet to put a steel bar and winch on plus im half way through building a packrack so im thinking with all that extra weight maybe i should be considering getting a reduction in the diff.
then 37's/38's might open as an option for my next wheels also.
(although im pritty sure there illegal on vic roads)