Underdrive in the rear differential

[RockGarden]

under drive in the rear is were it sounds like it works the best.. So much info this is great thanks for the help ( and this is not even my post )

[Kanine38]

Originally Posted by James003

the only benefit from both overdrive in front and underdrive in rear is for turning in my opinion. i've seen a rig perform with it on and it's almost like dig.

but I think it's too much, he also had a hard time with reversing. I have the under drive in the rear and I love it. I think it's all you need

[mudman1]

Anybody have a part# for the underdrive set?

[jagg]

Originally Posted by mudman1

anybody have a part# for the underdrive set?

ax30420 43/13
ax30401 36/14

[mudman1]

Originally Posted by jagg

ax30420 43/13
ax30401 36/14

I think you meant ax30402 but I got it anyways. Thanks for your help.

[jagg]

Originally Posted by mudman1

I think you meant ax30402 but I got it anyways. Thanks for your help.

Yah sorry bout that. 12hr shifts are really catching up to me, or maybe it was the brown bottle pops . I'll be ordering a set tomorrow.

[TruckerBrad]

I run the standard HD gears in the front and the underdrive in the rear. It helps with the TT and makes it a little easier to tune the TT out more using link placement, etc.

I've seen some scalers that have OD front and UD rear. They didn't seem to do too bad. I wouldn't like to see what happens if you get it bound up really bad though.

[rockerrc]

got my rear gears today can't wait to put them in and try it out will post up after with results

[liverkiller1]

jsut got my order from rpp and put the 43/13 gears in the rear, and vp knucks for my bta, with a little testing its hard to notice a difference, ppl say it helps with steering but it hard for me to tell at this point since i did the new knuckles too cant wait to take it to the homebrew course at the buddies house and do some real testing

[98zj5.9]

A couple in our club installed the under drive in the rear. Love it! Good luck

[DickyT]

I have the 43\13 in the rear of mine. There is a noticeable torque twist difference. I am very happy with how it drives with this setup.

[73fordhighboy]

Originally Posted by RockGarden

That might be a worry i have in the back of my head the trany... Has anyone running this setup ever ran into a trany problem?

have the rear gear. front driveshaft set screw loosened up and tore up the output on the transfer case. well worth it though.

[masscwlr]

I have a 9lb scale rig with rs pro 21.5 and plastic gears in the trans, I have the od front ud rear, it helps with all control. the truck did not want to go straight, had tqt. The gears helped alot. I also have the od/ud in my comp crawler, with very little wieght in the rear, same motor esc as scaler,vp dig, it has been bound up sevral times (plastic gears in trans), I have no problems so far. I have another crawler with the ud only, it does not work as well as my comp rig in turning or climbing. As far as reverse I have not noticed any problems (reverse adds points). I hope I've helped.

[racerfred]

So there is no answer on which one to get, if you could only get one. I wanted to get the under drive but not yet. What prices have you guys seen it for? Here a cheap link to over drives.

http://cgi.ebay.com/Axial-AX30401-AX...item4a9f03cbd7

[TruckerBrad]

Originally Posted by racerfred

So there is no answer on which one to get, if you could only get one.

If you could only get one I'd go with the UD for the rear. It will reduce your torque twist quite a bit.

[skywker51]

Originally Posted by RockGarden

That might be a worry i have in the back of my head the trany... Has anyone running this setup ever ran into a trany problem?

I havent had an issue with mine yet, Im runnin the 43/13 in front, stock in back.

Originally Posted by rockerrc

I'm tring the rear also thanks for the info

Thanks for in the info, This thread made me go out and try it. I like it much better now!

[salmonfacesalad]

[QUOTE=skywker51;2391474]I havent had an issue with mine yet, Im runnin the 43/13 in front, stock in back.


I thought the 36/14 was for the front, and the 43/13 is for the rear axle.

I assume you have undrive for your front axle.

[JesterSpec]

http://www.rpphobby.com/product_p/ax30401.htm

The lower gear range set reduces torque twist (43/13) (Rear 3.31)
The higher gear range offers higher top speed (36/14) (Front 2.57)
Use the gears in different combinations front and rear to reduce torque twist in the rear and overdrive the front axle to help pull you through climbs easier

4

[rockerrc]

just put my underdrive gears in last night there quite and very cool love the climbing and turning I'd say nice add on!

[rockerrc]

[QUOTE=salmonfacesalad;2391699]

Originally Posted by skywker51

I havent had an issue with mine yet, Im runnin the 43/13 in front, stock in back.


I thought the 36/14 was for the front, and the 43/13 is for the rear axle.

I assume you have undrive for your front axle.

thats diffrent how's the underdrive in the front work?