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Author Topic:   Torque-Link
Alltel
Dirt Maniac

Total posts: 180
posted March 19, 2005 07:13 PM  
I have a new 4-z setup for the first time. I put a double spring bar on for the torque link. It has a spring for acceleration and one for braking. I've ran twice and lost 2 drive shafts. The first one broke the yoke off on the transmission side, and the last broke the u-joint at the rear-end and bent the 8" yoke like a banana. My thinking is that the braking spring is allowing the rear-end to rotate too far and it's binding the u-joint up. Does anyone have any thoughts or experience on this? I've now spent over $210 on yokes alone and it's starting to get frustrating, plus the last time, it split the transmission in half. Can anyone confirm my thoughts, or offer any other suggestions as to what is happening?

dirtywrench13
Dirt Freak

Total posts: 324
posted March 20, 2005 05:24 AM  
sounds like you already know whats going on to me, i'd make sure driveshaft length is correct.how much travel is it getting? you may need to put in heavier springs to limit the movement.

HarrisMod#30
Dirt Freak

Total posts: 353
posted March 20, 2005 08:28 AM  
I dont even know if this is related, and i dont know if you have a shock on your rear end, but we had a bad shock on our rearend and it was snapping of u joints in the back, never the front though, just throwing some ideas out.

44nymod
Dirt Maniac

Total posts: 120
posted March 20, 2005 06:26 PM  
I just spoke this week to Afco and make sure you have it set up for your suspen. Put pre_load in for clamped and Zero for unclamped. One other thing is alot of people to my understanding think that since the bar is double action they don't run a shock on the rearend. The boy's from Afco told me to make sure I use a shock. Let me know if you are doing any of this or if anyone else is doing something diff that works. Besides the braking parts how was the bite? Any better? and setting the car?

Alltel
Dirt Maniac

Total posts: 180
posted March 20, 2005 06:38 PM  
I put the single spring bar on and reduced the pinion angle to 5*. I ran the double spring bar last year without the shock with no problems on a 3 link. I think it was the braking spring letting it gain too much pinion angle. At least, that's what I hope it was. If not, I might just have to quit racing for a while. The car had great forward bite, but it was too tight in. I couldn't really set the car, just had to throw it in. Track was very dry and it would get loose on me in the middle because of having to pitch it into the corner, but when I got back on the gas, it pulled great.

HarrisMod#30
Dirt Freak

Total posts: 353
posted March 20, 2005 07:43 PM  
Sounds very similar to what we were expiriencing when our shock went bad, car was so fricking tight going in it seemed like the car had no rear brakes, Id try a shock like the other guy reccomended and let us know what happened.

wingnut
Dirt Maniac

Total posts: 134
posted March 24, 2005 12:41 PM  
Hey guys,
Any updates on this , is it possible that the guys having problems did not have a shock on? Just wondering , because I was on the verge of trying to buy one , have any of you had any sucess stories with this deal?


Thanks

wingnut
Dirt Maniac

Total posts: 134
posted March 28, 2005 07:48 PM  
anyone ?? nymod, if you do get any new info on this , please keep us posted. I can't afford to make a mistake this pricey !! thanks

Dman
Dirt Freak

Total posts: 270
posted March 29, 2005 10:07 AM  
Wingnut,Run a shock. A 90/10 will be OK if you set the bar up as it should be according to the manufacturer.
Alltell,
Sounds like you have to much rear steer and not enough driveshaft. Best bet is to put the car on jackstands,remove the springs and run the rear susp.through its paces like it would travel during racing.

Alltel
Dirt Maniac

Total posts: 180
posted March 29, 2005 02:47 PM  
How much is too much rearsteer? I put a 1" shorter drive shaft on it. Where do you guys run the 8" yokes? I've got slightly less than half in the transmission.

Dman
Dirt Freak

Total posts: 270
posted March 30, 2005 08:04 AM  
Make sure your trans.tailshaft will accept all the yoke. Some tailshafts are not splined enough to take all the 8 ins. of yoke. This will cause big problems. Like I said earlier, do the homework. All these cars with big rear steer numbers need to be checked out because they all will steer differently according to spring, j-bar,bar length differences and track conditions. You can guess yourself out of a few driveshafts if you don't check it yourself.Pitching a driveshaft is a serious/dangerous thing. I would hate to be following you if you lost one.

HarrisMod#30
Dirt Freak

Total posts: 353
posted March 30, 2005 02:21 PM  
I had some tail that wouldnt accept 8 inches once also, opps wrong subject,lol, do what Dman said! Sorry guys i couldnt resist, I need to go racing!

Kromulous
Dirt Forum Champ
Total posts: 796
posted March 30, 2005 03:24 PM  
On the extended yoke, how much do you leave out of the tranny at ride height? i am plaaning on 2" to 2.5" out at ride height, this ok?

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted March 30, 2005 03:27 PM  
if it is the 8 inch yolk, i'd leave about 4.5 inches out... that leaves ample inside the tranny and enough for all the rear steer you can handle

Alltel
Dirt Maniac

Total posts: 180
posted March 30, 2005 06:46 PM  
It doesn't come within 2" of bottoming out, any way I move it at the house. This is why I think it may have been binding the u-joints. I've got 4.5-5" sticking out of a brinn transmission.

Weird thing Is, I ran this drive shaft, and it yanked it out of the housing last time, I put in a 1" longer one and it broke my last transmission in half, so I'm back to the original length, and I'm trying like crazy to limit the movement. I'm praying it was the stupid pull-bar. I guess I'll know this saturday.

Kromulous
Dirt Forum Champ
Total posts: 796
posted March 31, 2005 07:21 AM  
With those dual action pull bars, i would think you need to cut down your starting pinion angle, maybe about 5* max.

I used to run 7* with the a brake biscut, put with that spring on the front side, it may allow to much movement.

This year i made my own pull bar, spring on the backside, and a quickcar biscut in front. I should get better brake handling with the bigger biscut but i am going to cut down the static pinion angle to 5* to start.


Thanks Extreme, 4" inches is where i'll start.

Dman
Dirt Freak

Total posts: 270
posted April 01, 2005 07:24 AM  
Harrismod #30,
I knew someone would jump on it. It took all I had to refrain.

HarrisMod#30
Dirt Freak

Total posts: 353
posted April 01, 2005 02:58 PM  
lol been a long winter:P

Alltel
Dirt Maniac

Total posts: 180
posted April 03, 2005 02:17 PM  
Thanks to everyone. I guess I got it fixed. We came from 15th to 5th in the feature, then the motor blew, so it looks like we will be out for a while, but man was that thing fast.

wingnut
Dirt Maniac

Total posts: 134
posted April 03, 2005 07:15 PM  
alltell,
What did you change to fix the problem.
Thank you

Alltel
Dirt Maniac

Total posts: 180
posted April 04, 2005 05:50 PM  
put on an afco single spring bar, put on the 90/10 shock, used a 1" shorter drive shaft, and I took some pinion angle out of the rear-end. Couldn't tell you what did it, but I ain't gonna change it, if I get another motor. Car had great forward bite. I need to work on corner entry, besides that, it was wicked fast.

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