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  #1  
Old January 4th, 2013, 06:49 AM
sammyboyv8
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Sam
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USA members, help please!!

Hi all, im going to be running 33'' to 36'' tyres, what gearing do you guys run? Do you change the ring and pinion or the transfer box gearing?

Here in England theres not many people offer gear reductions, the few companies that do charge a small fortune.

I'd like first to be a crawler gear and plan on using 2nd and 3rd for general use (in low range)

Cheers

Sam.
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  #2  
Old January 4th, 2013, 07:50 AM
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Scott
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Most run 4.11 gears in the diffs with larger tires. I run them with my 35" tires.

For a crawler gear, I would suggest you pick up an Ashcroft under drive.
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  #3  
Old January 4th, 2013, 09:11 AM
sammyboyv8
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I was thinking 4.7:1 as im running a V8 so power and torque isnt an issue really, Ashcroft!! Have you seen their prices?! This is only an off roader it will never see the road again so spending alot of money isnt really necessary as long as it does the job.

Sam
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  #4  
Old January 4th, 2013, 09:33 AM
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4.7 is a good choice, since you will not be hitting any roads... But, I would still figure out a way to get the Ashcroft. I like that it is selectable.
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  #5  
Old January 4th, 2013, 09:37 AM
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Stephan Laputka
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Look at Great Basin Rovers in Utah. It's been a while since I last chatted with them but back in the day they had a number of final drive ratios for sale including ones taller than 4.11. I drive my truck on the road and only have 33s on it so I didn't do the final drive swap but I did do their transfer case re-gear. I was expensive (1200 bucks or something plus the labor) but my transfer case had thrown a bearing so it was one of those "while it's apart, might as well" type things. First gear low range for me now (95 NAS V8) is the same speed as a 300tidi with 4.11s in the same gear if not slower. High range is completely unaffected. I like it a lot. Plus I like the whine of the straight cut gears!

A combination of the transfer case re gear and 4.11 final drive would be a serious gear reduction.

http://gbrutah.com/cs_drivetrain_transfer%20case.html
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  #6  
Old January 4th, 2013, 09:45 AM
sammyboyv8
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Quote:
Originally Posted by sflash868 View Post
Look at Great Basin Rovers in Utah. It's been a while since I last chatted with them but back in the day they had a number of final drive ratios for sale including ones taller than 4.11. I drive my truck on the road and only have 33s on it so I didn't do the final drive swap but I did do their transfer case re-gear. I was expensive (1200 bucks or something plus the labor) but my transfer case had thrown a bearing so it was one of those "while it's apart, might as well" type things. First gear low range for me now (95 NAS V8) is the same speed as a 300tidi with 4.11s in the same gear if not slower. High range is completely unaffected. I like it a lot. Plus I like the whine of the straight cut gears!

A combination of the transfer case re gear and 4.11 final drive would be a serious gear reduction.

http://gbrutah.com/cs_drivetrain_transfer%20case.html

Thanks, thats the kind of thig i was looking for to be honest,it doesnt really matter how low first gear is, ive got another 4 to chose from if im bogging, a crawler gear is very much ascential in trials though as im running a manual gearbox not auto.

Sam
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  #7  
Old January 4th, 2013, 10:21 AM
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Bill Adams
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I know they're only ten spline, but can't one install Series third members? Those you should be able to find for stupid cheap.
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  #8  
Old January 4th, 2013, 10:29 AM
sammyboyv8
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Quote:
Originally Posted by o2batsea View Post
I know they're only ten spline, but can't one install Series third members? Those you should be able to find for stupid cheap.
I could do,i have thought about it but its the strength. There weak in comparison to a coiler 24 spline

Sam.
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  #9  
Old January 4th, 2013, 10:36 AM
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Yeah, well you can afford a whole lot of busted ten spline axles for what a set of ring and pinion gears plus installation will run you.
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  #10  
Old January 4th, 2013, 10:39 AM
sammyboyv8
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Its the hassle of chamging them in England, we have the rainy season all year round so were always in the mud,a wet field, a water hole etc etc Reliability is escential

If I lived in Utah things would be a whole lot different

Sam.
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  #11  
Old January 4th, 2013, 10:40 AM
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Chris
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Quote:
Originally Posted by o2batsea View Post
Yeah, well you can afford a whole lot of busted ten spline axles for what a set of ring and pinion gears plus installation will run you.
Bust R&p is a pain in the you know where on a trail.....
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  #12  
Old January 4th, 2013, 10:42 AM
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Dave Lucas
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I have been on the trail with people that have busted rover 4.7 gears and they were not doing anything hard or thrashing the rig.

I think you would be better served with the underdrive or put some Toyota 3rds in.
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  #13  
Old January 4th, 2013, 10:45 AM
sammyboyv8
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Quote:
Originally Posted by dave_lucas View Post
I have been on the trail with people that have busted rover 4.7 gears and they were not doing anything hard or thrashing the rig.

I think you would be better served with the underdrive or put some Toyota 3rds in.

I'll be chamging to Unimog portals in a year or so, so its not a major issue as such. The portal reduction will make first gear a 12mph flat out in 1st!!

It would be nice to have a cheaper way of doing it but nothing in motorsport comes cheap does it!
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  #14  
Old January 4th, 2013, 03:39 PM
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Sam... I had GBR 4.1:1 on my old 90 when I ran 35's.... it brought the gearing back to damn near standard (maybe slightly undergeared... as in, could have done with a 6 speed box)

But it negated the 35" tyres easily... trouble was, I had to change everything else to fit the bloody things... suspension lift, then CV propshaft, cranked arms, long travel shocks and bigger bump stops.

Became a right royal PITA in the end.... so i dropped back to 255/85 tyres and OME HD springs. was great after that.
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  #15  
Old January 4th, 2013, 05:52 PM
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Quote:
Originally Posted by sammyboyv8 View Post
Hi all, im going to be running 33'' to 36'' tyres, what gearing do you guys run?
uh? You mean you'll run a)33" OR 36" b)33" and 36" tires?

I run 34" and 36" (35,5"), I fitted KAM 4.1(1) R&Ps.

I engage the underdrive very rarely, mostly due to the lack of properly sized rocks around here.

4.11 ratio is okay (slightly LOW) with 34", and enough with 36" (slightly high), in my opinion.
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  #16  
Old January 4th, 2013, 05:59 PM
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I'm running 4.7 rover gears with 24 spline axles (ARB carrier) and 255/85s (33"). It's certainly high rpm's on the road (3350 @ 70mph), but is nice on the trail (rarely lose traction because of the reduced gearing and crawling ratio). When the day comes I'll probably go with GBR's 4.11 gears...though we'll see, his 4.71 kit is tempting too and would keep things where they are but with a more robust r&p.
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  #17  
Old January 5th, 2013, 07:50 AM
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Quote:
Originally Posted by nathanwind
I'm running 4.7 rover gears with 24 spline axles (ARB carrier) and 255/85s (33"). It's certainly high rpm's on the road (3350 @ 70mph), but is nice on the trail (rarely lose traction because of the reduced gearing and crawling ratio). When the day comes I'll probably go with GBR's 4.11 gears...though we'll see, his 4.71 kit is tempting too and would keep things where they are but with a more robust r&p.
If timing were right this would be a match in heaven.
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  #18  
Old January 5th, 2013, 08:22 AM
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If timing were right this would be a match in heaven.
Is somebody parting with GBR gears?
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  #19  
Old January 5th, 2013, 08:37 AM
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I may be parting with my 4.11s in a few months.
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  #20  
Old January 5th, 2013, 08:42 AM
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I may be parting with my 4.11s in a few months.
GBRs?

I owe you an email back on that light stuff too...
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