Reduction gears
Submitted: Monday, Jul 23, 2007 at 14:39
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Member - Earvin (NSW)
Hi all,
I went out yesterday to test out my new mud terrains and found this steep
hill which I ended up having to reverse back down. It was a good chance to practice my stall recovery. When going down I found that the Patrol just wanted to run away a bit too much. The gearing is just too high.
So who has reduction gears? Which type and what do you think of them?
Reply By: Member - Roachie (SA) - Monday, Jul 23, 2007 at 15:31
Monday, Jul 23, 2007 at 15:31
I have the Marks Adaptor 2.8:1 and they are gr8 x 10000000!!!!!
AnswerID:
254037
Reply By: Grungle - Monday, Jul 23, 2007 at 19:02
Monday, Jul 23, 2007 at 19:02
I have the Marks Gearmaster Gears which are 3.743:1 ratio or 85% reduction. I installed them myself no worries but the job was made easier by the fact I had a spare transfer case.
They would have to be one of the best investments for a 4wd - especially if towing in rough terrain. The control they provide is fantastic. Negotiating bad washouts/rocks where a really slow, steady approach is needed is made so much easier. Steep climbs can be done in second with a camper or third/fourth without - its nice to know you have an extra gear to two gears if required.
I can't remember reversing down a
hill due to running out of oomph since they were installed and driving down steep hills is done without braking at all - usually in second as
well.
The torque multiplication is what makes them so good. I originally bought them for our 2.8 GU Patrol because of the poor torque and drive by wire control and they were exceptional. Now I have the 4.2T installed the control is even better.
Only a couple of problems. Top speed is about 25kmh in 5th (can push the revs higher if you want) and they can be a problem in really really soft sand.
Regards
David
AnswerID:
254091
Follow Up By: Trevor R (QLD) - Monday, Jul 23, 2007 at 19:36
Monday, Jul 23, 2007 at 19:36
I have the same ratio as David's and I too reckon they are the best addition to my 4.2 Patrol. Even more fun than the performance mods in my engine bay.
If you get the same ratio as roachie, there is no grinding of the inside of transfer case so if people DIY then they may be a little easier to install. If however you are paying for fitting then get the ratio that best suit (IMO the 3.7' are streets ahead, but I'm mad don't forget LOL!!!)
Also, if you run (or plan to) bigger wheels the lower gears will be a huge help. Like most things, once you get them you will wonder why you didn't get it done years ago.
Regards, Trevor.
FollowupID:
515159
Follow Up By: Member - Earvin (NSW) - Monday, Jul 23, 2007 at 19:54
Monday, Jul 23, 2007 at 19:54
I didn't think of the benefits for towing the trailer through rough areas. I don't think it will be too long before I get a set installed.
FollowupID:
515164
Reply By: loughma - Tuesday, Jul 24, 2007 at 22:01
Tuesday, Jul 24, 2007 at 22:01
While on this subject can somebody explain to me how these reduction gears work in an automatic 4wd?
Because I can't decide for myself which gear to travel in, how would it work?
The vehicle would want to start off in first gear and this would be 'way too low' gearing.
Can someone explain from first hand experience.
Thanks Loughma.
AnswerID:
254316