RCCrawler Forums

sambmx · 12-30-2004, 06:06 PM

Does anybody run a shafty with different ratios in their differentials? Ive been wanting to try to have a higher gear ratio in the front than the rear ( so the front tire turns faster than the rear) to try to create a pulling effect so as the truck climbs a ledge it keeps the front planted and pulls it over the top. I think someone around here runs this in there clod (Grizz i think). And are different pinnions/ring gears avalable for maxx differentals?

Anyone whos has/tryed this how did it work out? Thanks.

Jneves · 12-30-2004, 11:25 PM

I havent tested this in the RC world but this seems to be an Urban myth of 1:1 4wheelers... and I'm gonna make an assumption and say if it doesnt work in fullsize rigs it wont work so well in the RC world (and yes I've seen it in a fullsize rig and it doesnt help!)

SR5Dave · 12-30-2004, 11:30 PM

It works with a clod because there is nothing mechanical to bind. Also, the reason Griz does it is to stop motor stall on a clod... not a problem on an e-maxx.

Jneves · 12-30-2004, 11:35 PM

Quote:

Originally Posted by SR5Dave

It works with a clod because there is nothing mechanical to bind. Also, the reason Griz does it is to stop motor stall on a clod... not a problem on an e-maxx.

exactly if the front and rear are mechanicly connected and have different ratios this means it will always be in a bind, so for the vehicle to move one end will always be spinning the tires (meaning constant broken traction)

fullmodtxt · 12-30-2004, 11:41 PM

Hi guys! This is an old mud bogging trick. Sometimes the axles ran the same R+P with different hieght tires to do it. The theory was kinda as mentioned here, it kept the front pulling so it was "light" over the mud (not planted). Now remember, a tire cannot be planted if it is spinning w/o traction. If you have 2 different ratios, it would theoretically force one end to spin or turn slower than the other; therefore forcing one axle to actually lose traction on a hard surface.
This wouldn't be a problem in mud because of the lack of traction. Like said before, nothing to bind between Clod axles. I don't think that there is a way to run different ratios in most shaftie diffs anyhow, is there? I know that Maxx and TXT/Jugg diffs are set permanently at thier own ratio. Wouldn't twin/mad force and x-factors be the same way?

SR5Dave · 12-31-2004, 10:34 AM

Quote:

Originally Posted by fullmodtxt

I don't think that there is a way to run different ratios in most shaftie diffs anyhow, is there? I know that Maxx and TXT/Jugg diffs are set permanently at thier own ratio. Wouldn't twin/mad force and x-factors be the same way?

Maybe with a limited slip center diff?

sambmx · 12-31-2004, 10:51 AM

The limited slip would deffenantly solve the binding, im wanting to try this now i just wish they had the parts. The way i figue it helping is when the rig is near or at vertical it will stop it from fliping backwards as the front tires ride over the top of the ledge.

Grizzly4x4 · 12-31-2004, 11:02 AM

I know that Toyo used to swap an MGT pinion into a TXT axle. So there is some possibility for swaps but I think they both had the same number of teeth.
The real problems are like said before, drivetrain bind and one set of tires being forced to slip. It works in a clod because there is no mechanical link between the front and rear axle (like Dave said).

However, if you had a motor and a tranny for each axle........you could have a Clod with driveshafts. I am planning to do this on a shafty and I saw it done on Kaetwo's TLT.

12-30-2004, 06:06 PM	#1
sambmx Pebble Pounder Join Date: Aug 2004 Location: orange county n.y. , building the hydro crawler Posts: 195	different differential gear ratios Does anybody run a shafty with different ratios in their differentials? Ive been wanting to try to have a higher gear ratio in the front than the rear ( so the front tire turns faster than the rear) to try to create a pulling effect so as the truck climbs a ledge it keeps the front planted and pulls it over the top. I think someone around here runs this in there clod (Grizz i think). And are different pinnions/ring gears avalable for maxx differentals? Anyone whos has/tryed this how did it work out? Thanks.

12-30-2004, 11:25 PM	#2
Jneves Rock Stacker Join Date: Oct 2004 Posts: 92	Re: different differential gear ratios I havent tested this in the RC world but this seems to be an Urban myth of 1:1 4wheelers... and I'm gonna make an assumption and say if it doesnt work in fullsize rigs it wont work so well in the RC world (and yes I've seen it in a fullsize rig and it doesnt help!)

12-30-2004, 11:30 PM	#3
SR5Dave I wanna be Dave Join Date: Jan 2004 Location: Flagstaff, AZ Posts: 2,399	Re: different differential gear ratios It works with a clod because there is nothing mechanical to bind. Also, the reason Griz does it is to stop motor stall on a clod... not a problem on an e-maxx.

12-30-2004, 11:41 PM	#5
fullmodtxt Quarry Creeper Join Date: May 2004 Location: Hartford, Connecticut Posts: 355	Re: different differential gear ratios Hi guys! This is an old mud bogging trick. Sometimes the axles ran the same R+P with different hieght tires to do it. The theory was kinda as mentioned here, it kept the front pulling so it was "light" over the mud (not planted). Now remember, a tire cannot be planted if it is spinning w/o traction. If you have 2 different ratios, it would theoretically force one end to spin or turn slower than the other; therefore forcing one axle to actually lose traction on a hard surface. This wouldn't be a problem in mud because of the lack of traction. Like said before, nothing to bind between Clod axles. I don't think that there is a way to run different ratios in most shaftie diffs anyhow, is there? I know that Maxx and TXT/Jugg diffs are set permanently at thier own ratio. Wouldn't twin/mad force and x-factors be the same way?

12-31-2004, 10:51 AM	#7
sambmx Pebble Pounder Join Date: Aug 2004 Location: orange county n.y. , building the hydro crawler Posts: 195	Re: different differential gear ratios The limited slip would deffenantly solve the binding, im wanting to try this now i just wish they had the parts. The way i figue it helping is when the rig is near or at vertical it will stop it from fliping backwards as the front tires ride over the top of the ledge.

12-31-2004, 11:02 AM	#8
Grizzly4x4 PapaGriz Yo Join Date: Apr 2004 Location: In the garage building the wife a crawler Posts: 13,137	Re: different differential gear ratios I know that Toyo used to swap an MGT pinion into a TXT axle. So there is some possibility for swaps but I think they both had the same number of teeth. The real problems are like said before, drivetrain bind and one set of tires being forced to slip. It works in a clod because there is no mechanical link between the front and rear axle (like Dave said). However, if you had a motor and a tranny for each axle........you could have a Clod with driveshafts. I am planning to do this on a shafty and I saw it done on Kaetwo's TLT.

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