CHANGING FROM MAXI'S TO GQ DIFFS IN RANGIE

Joined: 16 May 2008 Location: BUNDABERG

HI GUYS. I'M IN THE MIDDLE OF BUILDING A WINCH CHALLENGE TRUCK AND HAVE DECIDED TO CHANGE MY DIFF OVER. NOT KNOWING MUCH ABOUT RANGIES I'M UP FOR SUGGESTIONS. I HAVE FULLY BRACED DIFFS FRONT & REAR WITH MAXI DRIVE LOCKERS AND AXIALS AND SUPPOSED TO HAVE 4'11 RATIOS. I;VE BEEN TOLD THE FRONT GQ CONVERSION IS STRAIGHT FORWARD BUT TO PUT REAR GQ IS A BIT HARDER. SOMEONE ALSO SAID THAT 80SERS REAR DIFF IS THE GO. SO IF ANYONE CAN THROW SUGGESTIONS MY WAY IT WOULD BE GREAT. CHEERS. Smile

Joined: 01 Jul 2007 Location: gold coast as of 2009

how much for the front axle disc to disc

Joined: 29 May 2003 Location: hidin frm da wiminz!!!

how much for both Very Happy

Joined: 01 Jul 2007 Location: gold coast as of 2009

Joined: 15 Jan 2004 Location: gold coast

turn your caps lock OFF

Joined: 19 Feb 2003 Location: Perth, WA

defmec wrote:

how much for the front axle disc to disc

Me 2!

But to answer your question - 80 series rear is what you want.

Joined: 16 May 2008 Location: BUNDABERG

I thought i was asking for advise , not posting a 4sale. They will be up 4sale once i have finished building this truck. What r they worth guys? Apparently they must be hard 2 find. Any how i'll let you all know when that happens. Meanwhile anymore advise would be great. CHEERS

Joined: 10 Feb 2005 Location: Gold Coast QLD

Have 80 series in rear of mine and GQ front

finally got all sorted Laughing

(used to have GQ rear) bad choice Rolling Eyes

Anyways i'm looking at another Rangie.. would like to go Maxi

Not worth much anymore since they don't make em.. will give you say 1.5k for the lot armsup

Camo

Joined: 16 May 2008 Location: BUNDABERG

Thanks CAMO!! what was the prob with GQ rear? Is the maxi system better?

Joined: 01 Jul 2007 Location: gold coast as of 2009

go gq diffs the maxi,s suck ........................i,ll give ya $1500 for the front Very Happy

Joined: 01 Sep 2004 Location: BrisVegas

NUMB wrote:

Thanks CAMO!! what was the prob with GQ rear? Is the maxi system better?

The problem with the Nissan diff is the location of the pumpkin. Being a centre-mounted diff means that the angle for the drive shaft is too great and causes vibration issues and possible premature failing of the unis and pinion bearings.

The 80 series rear lines up pretty well with the transfer output, that is why most people use the 80 series rear instead of Nissan.

Joined: 10 Feb 2005 Location: Gold Coast QLD

Micka wrote:

NUMB wrote:

Thanks CAMO!! what was the prob with GQ rear? Is the maxi system better?

The problem with the Nissan diff is the location of the pumpkin. Being a centre-mounted diff means that the angle for the drive shaft is too great and causes vibration issues and possible premature failing of the unis and pinion bearings.

The 80 series rear lines up pretty well with the transfer output, that is why most people use the 80 series rear instead of Nissan.

Yep what he said Very Happy

Joined: 16 May 2008 Location: BUNDABERG

Thanks for that guys. Hows the track line up between the 80 and GQ?

Joined: 10 Feb 2005 Location: Gold Coast QLD

Same track width on both Smile

It really does work well.. plus having a wider track than the rover is great too

Camo

Joined: 21 May 2008 Location: Coffs Harbour, Australia

Hi,

the diff of the GQ is so big that you need 3" bigger tyres to get the same clearance under the diff.

And to get the same ratio nissan/toyota you need a diff centre from the 75 series in the back.

Stay on the maxis or do a toy conversion.

Greetings
Chris

Joined: 11 Jul 2003 Location: Melbourne

PacMan wrote:

Hi,

1)the diff of the GQ is so big that you need 3" bigger tyres to get the same clearance under the diff.

2)And to get the same ratio nissan/toyota you need a diff centre from the 75 series in the back.

3)Stay on the maxis or do a toy conversion.

Greetings
Chris

1)No. You loose 10mm under the diff (STD GQ Rear - in comparison to a ROUND rover rear, the flat bottom may gain an extra 5mm or so)

That equates to 1'' greater in diameter, Not 3''.

2) No. 4.10 to 4.11 is 0.0024% difference (ie negligible)

3) Each to their own

Cheers
Dave.

Joined: 11 Jul 2003 Location: Melbourne

I've just started this conversion.

I'm using adjustable rear control arms to ensure that the GQ pinion flange is parallel to the TC output flange at ride height to reduce / remove vibrations.

I'm also using GQ tail shafts, as the uni's are also bigger to combat this issue.

For what I paid for both front and rear diffs, I'm having a go using the GQ diff.

Good luck

Dave.

Joined: 06 Sep 2005 Location: Melbourne

Quote:

2) No. 4.10 to 4.11 is 0.0024% difference (ie negligible)

Surprisingly, not as negligible as you might think:

http://www.outerlimits4x4.com/phpBB2/ftopic130440-0-0-asc-.php

Joined: 11 Jul 2003 Location: Melbourne

RangingRover wrote:

Quote:

2) No. 4.10 to 4.11 is 0.0024% difference (ie negligible)

Surprisingly, not as negligible as you might think:

http://www.outerlimits4x4.com/phpBB2/ftopic130440-0-0-asc-.php

There you go - interesting that there others running 4.1 to 4.11 without the same complaint though.

As is a comp car, I'd run it.

Cheers
Dave.

Joined: 21 May 2008 Location: Coffs Harbour, Australia

Hi,

a GQ axle in the back is always a problem because the drive shaft.

But anyway i am speak about the clearance under the front diff ( ~1.3" lower than RR front diff).

Greetings
Chris

Joined: 10 Feb 2005 Location: Gold Coast QLD

DaveS3 wrote:

I've just started this conversion.

I'm using adjustable rear control arms to ensure that the GQ pinion flange is parallel to the TC output flange at ride height to reduce / remove vibrations.

I'm also using GQ tail shafts, as the uni's are also bigger to combat this issue.

For what I paid for both front and rear diffs, I'm having a go using the GQ diff.

Good luck

Dave.

Have fun with the vibes #Rofl

My biggest regret was taking advise from an engineer.. said rear GQ would be fine if setup right.. biggest load of crap!!

Have fun with it though Dave... fine offroad but after an hour on the highway you will get sick of it real quick

Camo

Joined: 19 Feb 2003 Location: Perth, WA

V8 Rangie wrote:

DaveS3 wrote:

I've just started this conversion.

I'm using adjustable rear control arms to ensure that the GQ pinion flange is parallel to the TC output flange at ride height to reduce / remove vibrations.

I'm also using GQ tail shafts, as the uni's are also bigger to combat this issue.

For what I paid for both front and rear diffs, I'm having a go using the GQ diff.

Good luck

Dave.

Have fun with the vibes #Rofl

My biggest regret was taking advise from an engineer.. said rear GQ would be fine if setup right.. biggest load of crap!!

Have fun with it though Dave... fine offroad but after an hour on the highway you will get sick of it real quick

Camo

Camo, the difference in ratios is LESS than the variation you would get front-back in tyre diameter if you were running different brands or a couple of PSI difference in pressure. I don't doubt you experiencedd what you did, but I can't see how it was caused by the ratio difference.

Joined: 11 Jul 2003 Location: Melbourne

PacMan wrote:

Hi,

a GQ axle in the back is always a problem because the drive shaft.

But anyway i am speak about the clearance under the front diff ( ~1.3" lower than RR front diff).

Greetings
Chris

No worries.

I'm not sure where you got the 1.3'' from but anyway.

I'm dubious on others conversions as they CAN be set up with none if not minimal vibes (ie after 110 - 120+km/h)
I can certainly live with that.

Cheers.

Joined: 11 Jul 2003 Location: Melbourne

V8 Rangie wrote:

DaveS3 wrote:

I've just started this conversion.

I'm using adjustable rear control arms to ensure that the GQ pinion flange is parallel to the TC output flange at ride height to reduce / remove vibrations.

I'm also using GQ tail shafts, as the uni's are also bigger to combat this issue.

For what I paid for both front and rear diffs, I'm having a go using the GQ diff.

Good luck

Dave.

Have fun with the vibes #Rofl

My biggest regret was taking advise from an engineer.. said rear GQ would be fine if setup right.. biggest load of crap!!

Have fun with it though Dave... fine offroad but after an hour on the highway you will get sick of it real quick

Camo

For my sake I just hope I have better luck Laughing

Either way, I'm willing to try as it is costing me not much more than my time.

Cheers
Dave.

Joined: 10 Feb 2005 Location: Gold Coast QLD

Must have go the GQ's cheap! haha

LC's only go for around $500..

Camo

Joined: 10 Feb 2005 Location: Gold Coast QLD

ISUZUROVER wrote:

Camo, the difference in ratios is LESS than the variation you would get front-back in tyre diameter if you were running different brands or a couple of PSI difference in pressure. I don't doubt you experiencedd what you did, but I can't see how it was caused by the ratio difference.

I know.. I couldn't understand it either.. normal driving was fine.. but when you put the centre diff lock in the car would start to shake after 20 meters on the tar. (brand new tyres all round)

Soon as I put the 4.11 in the rear i tried with the centre diff lock in and suprise suprise.. no shake at all!

One happy camper here armsup

.. cheap and easy fix.

time for some Pro Lockers in the next few weeks

Camo

Joined: 04 Apr 2008 Location: West Victoria

Has anyone put an 80 series diff in the front? What is the difference with the GQ?

Neale

Joined: 01 Sep 2004 Location: BrisVegas

Corgie Carrier wrote:

Has anyone put an 80 series diff in the front? What is the difference with the GQ?

Neale

Nissans have a bigger diff. 80 series is an 8" diff and the nissan is 9.25".

Joined: 22 Oct 2002 Location: brisbane

i still don't know why anyone would go to the effort of putting gq diffs in a rover??? no matter what you do the nissan diffs can't be built as strong a toy 60 series diffs for the same $$$. and the 60's are offset F&R!!! they are less prone to bending the front at the swivel ball like nissans, the kingpin inclination is better which makes them WAAAAAY less sensititve to castor changes (less nissan death wobbles). DAMN you can buy a WHOLE 60 series for <$500, the diff centers are interchangeable as are the lockers, the rear axles are stronger (better material and hardening process). there is SOOOOO much aftermarket stuff for them cheap!!!.

If you are going to go to the effort of a diff swap the do it properly, not just half-ar$ed. put decent mounts on the 60's diff, cut and rotate the knucles to get better shaft/pinion angles and put some good chromo bits in it!!! then wheel the beeejeesusss out of it!!! Rovers have such a good drivetrain, don't spoil it with nissan junk..

Joined: 20 Oct 2002 Location: Greenbank

1MadEngineer wrote:

i still don't know why anyone would go to the effort of putting gq diffs in a rover??? no matter what you do the nissan diffs can't be built as strong a toy 60 series diffs for the same $$$. and the 60's are offset F&R!!! they are less prone to bending the front at the swivel ball like nissans, the kingpin inclination is better which makes them WAAAAAY less sensititve to castor changes (less nissan death wobbles). DAMN you can buy a WHOLE 60 series for <$500, the diff centers are interchangeable as are the lockers, the rear axles are stronger (better material and hardening process). there is SOOOOO much aftermarket stuff for them cheap!!!.

If you are going to go to the effort of a diff swap the do it properly, not just half-ar$ed. put decent mounts on the 60's diff, cut and rotate the knucles to get better shaft/pinion angles and put some good chromo bits in it!!! then wheel the beeejeesusss out of it!!! Rovers have such a good drivetrain, don't spoil it with nissan junk..

I doubt the 60 series diffs are wide enough to fit under a rover.