What final drive diff gears are you running? - Land Rovers Only

300bhp/ton · 10-31-2006, 02:12 PM

Been thinking of swapping out the diff gears to 4.75:1 anyone have any experience with non-stock gears?

p76rangie · 10-31-2006, 02:23 PM

I run 4.11's with reverse cut front gears.

Ian

300bhp/ton · 10-31-2006, 02:47 PM

What size tyres? And is that a diesel or V8? Cheers.

Disco Mike · 10-31-2006, 02:50 PM

I am running 4:11's, from Great Basin Rovers, and 265/75/16 tires.
Why are you thinking about such low gears?
Mike

p76rangie · 10-31-2006, 06:32 PM

I run 34 inch tyres and a 4.4ltr V8. With this size tyre the end gearing is absically the same as stock.

Ian

Hank · 10-31-2006, 09:42 PM

4.75's in a Rover is getting pretty weak. Be fine for a pavement pounder, though. Be fine off-road, too. But, you would be on borrowed time with a large tire.

300bhp/ton · 11-01-2006, 04:15 AM

Well I've been looking at the gears from Kamdiffs.

They offer 4.75, 4.1 and 3.8:1

http://www.kamdiffs.com/ratios_detailed.htm

According to them the 4.75 gears should be pretty strong, I know a few people who have broken ring/pinion teeth. They also offer upgraded driveshafts, although I don't think I'd worry until I actually broke one.

I run 33.11.50 R15 at present. This is up from stock 28" tyres for 1991 models. These tyres really kill on road accelaration and I'd like something that is capable of going slower in low 1st when off roading. Also the extra umphf offer by the lower gears should be a benifit.

Do you think 4.75 is over kill and I'd be better off with 4.1:1 gears instead. I just don't want the engine bogging on steep inclines while off roading. The diesel makes great low end torque, but only once the turbo's kicked in.

jhmover · 11-01-2006, 06:36 AM

4:75's are awful low. Pinion gear will be tiny, too. Were it me I'd go with the 4:11's.

300bhp/ton · 11-01-2006, 07:12 AM

Well all Series Land Rovers use 4.7:1 so it's not as if they are out of this world.

p76rangie · 11-01-2006, 12:56 PM

But the series landrovers had no power to break them. As soon as the went to V8's they went to 3.54's.

jhmover · 11-01-2006, 07:55 PM

Not only no power to break them, no power at all, so they needed the gears to go anyplace. You can go anywhere with real low gears and little HP, but when you add the HP then stuff is going to break. My dad had a 46 Willys Jeep when I was a kid, had 5:33's in it, never broke anything due to the whopping 40 or so HP the flathead 4-banger made. Would climb a tree figuratively speaking but top speed was about 45-50 in overdrive downhill with a large tailwind.

10-31-2006, 02:12 PM	#1 (permalink)
300bhp/ton The Best 4X4XFar Join Date: Mar 2005 Location: England, home of the Land Rover Posts: 598 Gallery: 0	What final drive diff gears are you running? Been thinking of swapping out the diff gears to 4.75:1 anyone have any experience with non-stock gears? __________________ Land Rover Discovery (3 Door) 200Tdi 5-speed Mods:Allisport LARGE FMIC \| Allisport Tuned \| Simex Jungle Trekker II 33.11.50R15 Tyres \| 15x8 8 Spokes \| Heavy Duty Uprated Suspension (shocks & springs) \| Wheel arch Flares \| 1" Wheel Spacers \| Custom Straight Thru Exhaust \| Custom Trimmed Front bumper with twin NATO Hooks \| Custom Rear Bumper with single Large NATO Hook 360˚ Swival \| Front Light Guards \| Custom Aluminium Rear Floor \| Bonnet Straps \| 100w Spot Lights \| Upgraded Headlights The Best 4X4XFar

10-31-2006, 02:47 PM	#3 (permalink)
300bhp/ton The Best 4X4XFar Join Date: Mar 2005 Location: England, home of the Land Rover Posts: 598 Gallery: 0	What size tyres? And is that a diesel or V8? Cheers. __________________ Land Rover Discovery (3 Door) 200Tdi 5-speed Mods:Allisport LARGE FMIC \| Allisport Tuned \| Simex Jungle Trekker II 33.11.50R15 Tyres \| 15x8 8 Spokes \| Heavy Duty Uprated Suspension (shocks & springs) \| Wheel arch Flares \| 1" Wheel Spacers \| Custom Straight Thru Exhaust \| Custom Trimmed Front bumper with twin NATO Hooks \| Custom Rear Bumper with single Large NATO Hook 360˚ Swival \| Front Light Guards \| Custom Aluminium Rear Floor \| Bonnet Straps \| 100w Spot Lights \| Upgraded Headlights The Best 4X4XFar

11-01-2006, 04:15 AM	#7 (permalink)
300bhp/ton The Best 4X4XFar Join Date: Mar 2005 Location: England, home of the Land Rover Posts: 598 Gallery: 0	Well I've been looking at the gears from Kamdiffs. They offer 4.75, 4.1 and 3.8:1 http://www.kamdiffs.com/ratios_detailed.htm According to them the 4.75 gears should be pretty strong, I know a few people who have broken ring/pinion teeth. They also offer upgraded driveshafts, although I don't think I'd worry until I actually broke one. I run 33.11.50 R15 at present. This is up from stock 28" tyres for 1991 models. These tyres really kill on road accelaration and I'd like something that is capable of going slower in low 1st when off roading. Also the extra umphf offer by the lower gears should be a benifit. Do you think 4.75 is over kill and I'd be better off with 4.1:1 gears instead. I just don't want the engine bogging on steep inclines while off roading. The diesel makes great low end torque, but only once the turbo's kicked in. __________________ Land Rover Discovery (3 Door) 200Tdi 5-speed Mods:Allisport LARGE FMIC \| Allisport Tuned \| Simex Jungle Trekker II 33.11.50R15 Tyres \| 15x8 8 Spokes \| Heavy Duty Uprated Suspension (shocks & springs) \| Wheel arch Flares \| 1" Wheel Spacers \| Custom Straight Thru Exhaust \| Custom Trimmed Front bumper with twin NATO Hooks \| Custom Rear Bumper with single Large NATO Hook 360˚ Swival \| Front Light Guards \| Custom Aluminium Rear Floor \| Bonnet Straps \| 100w Spot Lights \| Upgraded Headlights The Best 4X4XFar

11-01-2006, 07:12 AM	#9 (permalink)
300bhp/ton The Best 4X4XFar Join Date: Mar 2005 Location: England, home of the Land Rover Posts: 598 Gallery: 0	Well all Series Land Rovers use 4.7:1 so it's not as if they are out of this world. __________________ Land Rover Discovery (3 Door) 200Tdi 5-speed Mods:Allisport LARGE FMIC \| Allisport Tuned \| Simex Jungle Trekker II 33.11.50R15 Tyres \| 15x8 8 Spokes \| Heavy Duty Uprated Suspension (shocks & springs) \| Wheel arch Flares \| 1" Wheel Spacers \| Custom Straight Thru Exhaust \| Custom Trimmed Front bumper with twin NATO Hooks \| Custom Rear Bumper with single Large NATO Hook 360˚ Swival \| Front Light Guards \| Custom Aluminium Rear Floor \| Bonnet Straps \| 100w Spot Lights \| Upgraded Headlights The Best 4X4XFar

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10-31-2006, 02:23 PM	#2 (permalink)
p76rangie Ian Matthews Join Date: Jan 2006 Location: Melbourne Australia Posts: 1,958 Gallery: 0	I run 4.11's with reverse cut front gears. Ian

10-31-2006, 02:50 PM	#4 (permalink)
Disco Mike Moderator Join Date: Aug 2004 Location: Parker, Colorado Posts: 5,166 Gallery: 0	I am running 4:11's, from Great Basin Rovers, and 265/75/16 tires. Why are you thinking about such low gears? Mike

10-31-2006, 06:32 PM	#5 (permalink)
p76rangie Ian Matthews Join Date: Jan 2006 Location: Melbourne Australia Posts: 1,958 Gallery: 0	I run 34 inch tyres and a 4.4ltr V8. With this size tyre the end gearing is absically the same as stock. Ian

10-31-2006, 09:42 PM	#6 (permalink)
Hank Banned Join Date: Feb 2005 Location: VA Posts: 914 Gallery: 0	4.75's in a Rover is getting pretty weak. Be fine for a pavement pounder, though. Be fine off-road, too. But, you would be on borrowed time with a large tire.

11-01-2006, 06:36 AM	#8 (permalink)
jhmover Senior Member Join Date: Aug 2005 Posts: 310 Gallery: 0	4:75's are awful low. Pinion gear will be tiny, too. Were it me I'd go with the 4:11's.

11-01-2006, 12:56 PM	#10 (permalink)
p76rangie Ian Matthews Join Date: Jan 2006 Location: Melbourne Australia Posts: 1,958 Gallery: 0	But the series landrovers had no power to break them. As soon as the went to V8's they went to 3.54's.

11-01-2006, 07:55 PM	#11 (permalink)
jhmover Senior Member Join Date: Aug 2005 Posts: 310 Gallery: 0	Not only no power to break them, no power at all, so they needed the gears to go anyplace. You can go anywhere with real low gears and little HP, but when you add the HP then stuff is going to break. My dad had a 46 Willys Jeep when I was a kid, had 5:33's in it, never broke anything due to the whopping 40 or so HP the flathead 4-banger made. Would climb a tree figuratively speaking but top speed was about 45-50 in overdrive downhill with a large tailwind.

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