Recommened Hellcat Axle Upgrade?

[Marc W]

All I'm finding is pst in new jersey. Performance Suspension Technology.

I found them.

. Precision Shaft Technologies

 

[DavidKFla]

. Precision Shaft Technologies

I talked to them and they need measurements. HHP has an aluminum one in stock along with the lock outs so I ordered it. I can always replace it later.

 

[MiHiHemi]

I went Redeye half shafts and ended up having to source them from a donor car at salvage. They worked out great though and super happy so far.

 

[RGPIII]

Definitely time to upgrade driveshaft and axles. I've run a DSS aluminum and currently have a QA1 carbon shaft. Running Demon axles. The BMR lockout is absolutely worth it as well. quick note, the 2021 widebody cars have the Redeye axles in them.

 

[Marc W]

I talked to them and they need measurements. HHP has an aluminum one in stock along with the lock outs so I ordered it. I can always replace it later.

I’ve come to believe that the cradle lock outs are the number one critical piece to start the rear end process. I believe that DSS requires them to warranty their stuff. David here actually documented how much that cradle can/will move, impacting the shaft and transmission.

 

[DavidKFla]

I’ve come to believe that the cradle lock outs are the number one critical piece to start the rear end process. I believe that DSS requires them to warranty their stuff. David here actually documented how much that cradle can/will move, impacting the shaft and transmission.

I'm setting up getting them put in now. No warranty without them.

Next Tuesday for the lockouts and driveshaft install. Now I can make a hit and not worry so much about breaking it.

Axles are next.

 

[Speedy!]

I'd do the drive shaft and Per4mance Development big boy diff brace and call it a day. I'm on stock axles and have a stack of time slips an inch thick most of which are 10.00 or better. If it ain't broke don't fix it.

I also just confirmed with my buddy who's got the quickest 6spd Hellcat (I think) and he's still on stock axles and he's been racing it since 2015. He broke one axle a couple years back but that's it in 8 years. His car is pretty well modified 15" conversion, big sticky tires, 2.65 upper pulley, and he has a 2 step set at like 5,000 RPM. He won the stick shift shootout at Moparty the past 2 years.

 

[DavidKFla]

I'd do the drive shaft and Per4mance Development big boy diff brace and call it a day. I'm on stock axles and have a stack of time slips an inch thick most of which are 10.00 or better. If it ain't broke don't fix it.

I also just confirmed with my buddy who's got the quickest 6spd Hellcat (I think) and he's still on stock axles and he's been racing it since 2015. He broke one axle a couple years back but that's it in 8 years. His car is pretty well modified 15" conversion, big sticky tires, 2.65 upper pulley, and he has a 2 step set at like 5,000 RPM. He won the stick shift shootout at Moparty the past 2 years.

I've had the big diff brace for a couple of years now. It was 1 of my 1st mods. Added the front brace earlier this year. I'm getting it gone through again on Wednesday so hopefully the axles and driveshaft look good for testing on Friday.

 

[DavidKFla]

I recently added a PST Carbon Fiber to mine. It’s tested to 2800 lbs torque. The same 3.75” shaft is available for the Hellcat now. The only caution would be that you will need to do a serious job of heat shielding the exhaust if you are running on the street. I think that shaft is running right around $2k. It’s super light and balanced/rpm limit rated to 14,000 rpm. View attachment 86029 View attachment 86030 View attachment 86031

Where did you get the driveshaft loop at. I have 1 and it looks like 1/4 the strength of yours.

 

[Marc W]

Where did you get the driveshaft loop at. I have 1 and it looks like 1/4 the strength of yours.

That is a TH400 crossmember/trans mount with the loop. Not for you. Yet 😂 we sell them when you’re ready.

 

[DavidKFla]

That is a TH400 crossmember/trans mount with the loop. Not for you. Yet 😂 we sell them when you’re ready. View attachment 86056 View attachment 86057

If I ever change it will probably be a 4L80E or whatever it's called. In case I do drag and drive.

 

[drag racer]

yep, having OD of some sort is the way to go for D&D events then you can gear more optimally for 1/4 mile perf.

 

[ACMAVRO]

That is a TH400 crossmember/trans mount with the loop. Not for you. Yet 😂 we sell them when you’re ready. View attachment 86056 View attachment 86057

Those are sweet! I’ve gotta find or make one for an m6 with dss and Barton. The gforce has terrible fitment. Almost got sent home the other night for not having it.

 

[vortecd]

If I ever change it will probably be a 4L80E or whatever it's called. In case I do drag and drive.

How fast you plan on going? The 8 speed will go well into the 8s if not the 7s

 

[DavidKFla]

How fast you plan on going? The 8 speed will go well into the 8s if not the 7s

Nothing to do with speed.

 

[ACMAVRO]

I'd do the drive shaft and Per4mance Development big boy diff brace and call it a day. I'm on stock axles and have a stack of time slips an inch thick most of which are 10.00 or better. If it ain't broke don't fix it.

I also just confirmed with my buddy who's got the quickest 6spd Hellcat (I think) and he's still on stock axles and he's been racing it since 2015. He broke one axle a couple years back but that's it in 8 years. His car is pretty well modified 15" conversion, big sticky tires, 2.65 upper pulley, and he has a 2 step set at like 5,000 RPM. He won the stick shift shootout at Moparty the past 2 years.

I've seen his posts of progress at the other place, but I dont think he post anymore. Do you know if he's still using that rxt1200? I ended up going with mantic, but his success with the mcleod really kept me second guessing what to get.

 

[Marc W]

Those are sweet! I’ve gotta find or make one for an m6 with dss and Barton. The gforce has terrible fitment. Almost got sent home the other night for not having it.

Problem is there aren’t enough M6 cars drag racing to warrant mass producing one. I don’t doubt that we could build one just like that for your M6 but it would probably run you $1k for the labor at the shop rate. Those loops that bolt to the stock crossmember with a couple bolts are bs. That DS ever breaks, it will tear one of those right out and start twirling it around.

 

[Marc W]

How fast you plan on going? The 8 speed will go well into the 8s if not the 7s

You don’t have to look any further than Zdung to see how fast you can go with a hp90. 7.7’s at 184 mph now😵‍💫. You need to be sponsored by a trans company like he is (Paramount) to do that. I just saw the picture of him smiling as he changed his broken 8 spd at the track before making his omg pass. He’s got that down now 😂. The new internals available make the hp90’s a lot stronger than in the past, so unless you’re running a M6 (easy swap to the 400) or are planning on going past 1200 whp, I think you’re good with one of the improved 8 speeds.

 

[Jack_Toepfer]

I have both the front and rear diff braces so that's covered.

What’s a front diff brace? Is it an extra piece for the diff? (The only diff on the car.)

I also just confirmed with my buddy who's got the quickest 6spd Hellcat (I think) and he's still on stock axles and he's been racing it since 2015. He broke one axle a couple years back but that's it in 8 years. His car is pretty well modified 15" conversion, big sticky tires, 2.65 upper pulley, and he has a 2 step set at like 5,000 RPM. He won the stick shift shootout at Moparty the past 2 years.

My buddy has an E85 M6 ‘Cat and he broke an axle the first time he had traction. Fewer than 10 hits on the car. Breaking axles isn’t as common on the A8 cars because there isn’t as much shock, I don’t think. Especially when you consider how many stock axles are running 9s or 8s vs total M6 cars in the 9s. M6 cars with traction and a clutch should consider bringing a spare to the track.

 

[Speedy!]

Chad isn't have problems with his M6 and races all the time. He did go to DSS axles for one race and they "clunked" his words not mine so he went back to stock. That was 4 years ago. Maybe your buddy isn't loading the drive line at launch or something? I always brought my clutch up to the grab point before letting her rip back when I raced an M6.

I guess my point is that if those stock axles are working in Chad's M6 running 9s (a lot) then they should be good to go in an A8. With all the issues I hear about on upgraded axles, if I did anything at all it would be going to Redeye versions.