Another destroyed transmission....

[Dusty]

The high horse Hellcat guys are picking the left tire up noticably higher then the right front tire,and they're not breaking transmission cases,but that doesn't rule out frame twist under launch on the trucks not being the issue though. Both the cars and trucks use a viscose motor mount that allows a fair bit of motor twist under power. Combine motor mount flex and frame flex together and that might be why the regular cab shortbox trucks are breaking transmission cases

I've only ever seen two, maybe three cracked transmission cases in racing applications. But one thing I don't ever remember seeing is the bellhousing pulling away from the top of the rear apron of the engine like that.

Is that a clue? Don't know.

I'm beginning to think chaining the motor mounts is a good idea.

Regards,
Dusty
2019 Ram 1500 Billet Silver Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33-gallon fuel tank, factory dual exhaust, 18” wheels. Build date: 3 June 2018. Now at 78809 miles

 

[Wild one]

That profile picture was with a 1st gear leave with a built 8HP70, that was the last time that I have left the line from 1st gear. Now I launch from 2nd gear and front end stays on the ground. Does anyone offer any more suitable motor mounts for my application? Also where could I find that turnbuckle/chain that you used on the driver side of your engine?

I had the chain and turnbuckle laying around,but any hardware /farm store will have the chain and the turnbuckles in stock. I do know before adding the chain,if i floored the engine in neutral the truck didn't really move,after adding the chain to the frame,if i did the same floor it in neutral the truck would rock very noticiably,which means the motor mounts were moving/flexing a fair bit and not really transferring the motors motion to the frame,and that means the transmission would be the binding factor.Chaining the drivers side of the motor down has been around since i was knee high to a dinosaur,so basically since the dawn of time,lol

 

[Marshall]

I have seen quite a few chains , usually just go buy some good 3/8" good chain and #8n grade bolts, but is more in the old stock car dirt track boys with old ****** cars. I wonder ,if you are making that much power, and blowing up that much money, how about a good split drive shaft.
Also hang a camera under there to scan the trans, drive shaft.
just thinking out loud.

Back when the kids where running a 340 w duster with 4 sp and 4.10 rear, we bought, that body would twist so much it would pop the windows out of place on the doors, and had a door pop open . But those cars where not designed for that much hp.

 

[Josh22855]

I had some severe vibrations with a previous driveshaft so I had one made and it was a night and day difference. I am now convinced that the engine needs better mounts/chain.

 

[Wild one]

I had some severe vibrations with a previous driveshaft so I had one made and it was a night and day difference. I am now convinced that the engine needs better mounts/chain.

You could do both sides,but the pass side usually isn't done as the motor puts all the load on the drivers side mount when you're in a forward gear. There were rumours floating around awhile ago about solid mounts for the trucks,but i don't know if anybody ever got around to manufacturing them

 

[Josh22855]

You could do both sides,but the pass side usually isn't done as the motor puts all the load on the drivers side mount when you're in a forward gear. There were rumours floating around awhile ago about solid mounts for the trucks,but i don't know if anybody ever got around to manufacturing them

I did a search for them but cannot seem to find anything like that.

 

[RayC]

Not sure the torque, it's a stroker with a procharger....the torque is definitely there

Did you have the driveshaft checked for balance even though you can't feel anything. Cuz I'm sure at 133 with everything else going on your truck is probably not Cadillac smooth anyway so you may not notice a vibration.

 

[pacofortacos]

I had the chain and turnbuckle laying around,but any hardware /farm store will have the chain and the turnbuckles in stock. I do know before adding the chain,if i floored the engine in neutral the truck didn't really move,after adding the chain to the frame,if i did the same floor it in neutral the truck would rock very noticiably,which means the motor mounts were moving/flexing a fair bit and not really transferring the motors motion to the frame,and that means the transmission would be the binding factor.Chaining the drivers side of the motor down has been around since i was knee high to a dinosaur,so basically since the dawn of time,lol

I remember when some cars came with a torque strap on the DS motor mount from the factory. It wasn't quite like the chain since it wasn't under tension - it's main purpose was when the old biscuit motor mounts would break it would limit the motor rotation.
If I remember correctly there was one on my 69 Newport, DS motor mount broke would only last a month or so on that car.
After the second mount, I just let the strap do it's job.

Does the chain transmit engine vibration through the body since it looks like it is tight?

 

[Wild one]

I remember when some cars came with a torque strap on the DS motor mount from the factory. It wasn't quite like the chain since it wasn't under tension - it's main purpose was when the old biscuit motor mounts would break it would limit the motor rotation.
If I remember correctly there was one on my 69 Newport, DS motor mount broke would only last a month or so on that car.
After the second mount, I just let the strap do it's job.

Does the chain transmit engine vibration through the body since it looks like it is tight?

No,it's not that tight.The turnbuckle is only hand tightened,it's fairly snug,but not enough to squash the mount down to where it would transmit vibration to the frame that you would feel in the body.Remember the cab is also mounted on rubber mounts,so you'd need a pile of frame vibration before you'd start to feel anything in the body

 

[ppine]

Stop racing and your trans will last a long time.

 

[Wild one]

Stop racing and your trans will last a long time.

That's about as dumb a statement as i've heard lately. Would you say that to Ashley Force or her dad John Force when they blow up parts

 

[Dodge 1500 4X4]

Long live NHRA forever!!!

 

[mtwofeathers]

Not so much ripping the center bearing apart,but they are literally twisting the stock driveshafts into pretzels,but they're not breaking the tranny cases

I built up a 68re, case is a little better. billet output, tore center bearing out. Went to single heavy steel. Broke a rear axle. Next race tore ujoint our in front on pull. Eventually I will have broke broken all the parts. Tranny still holding up, so far.....

 

[crazykid1994]

Every time you strengthen a part you will find the next week link. Such is life unfortunately.

 

[Josh22855]

Little video of the damage.

- YouTube

Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.

youtu.be

 

[ppine]

I would say it to anyone that abuses machinery and expects it to last.
Doesn't matter if it is road construction, logging, mining or racing.
If you want to race then everything has to be built up, modified or replaced with something stronger.
You will definitely find the weak link in your chain.

Is this a racing site now?

 

[Wild one]

I would say it to anyone that abuses machinery and expects it to last.
Doesn't matter if it is road construction, logging, mining or racing.
If you want to race then everything has to be built up, modified or replaced with something stronger.
You will definitely find the weak link in your chain.

Is this a racing site now?

Why are you on this thread?? You don't really have anything constuctive to say. If you don't like the thread "scroll on by",nobody is forcing you to read anything.

 

[crazykid1994]

I would say it to anyone that abuses machinery and expects it to last.
Doesn't matter if it is road construction, logging, mining or racing.
If you want to race then everything has to be built up, modified or replaced with something stronger.
You will definitely find the weak link in your chain.

Is this a racing site now?

As a matter of fact the 8hp90 is behind the hellcat which is aimed towards high horse racing so maybe you should take a step back. Also this site is for all dodge/ram trucks whether it’s racing, daily driving, restoration, converting it for camping, towing upgrades, performance upgrades, troubleshooting, or if someone just wants to be an ****

 

[Wild one]

Little video of the damage.

- YouTube

Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.

youtu.be

Some JB Weld and Duct Tape will fix that right up, just kidding,lol. That must of got a bit noisy for a few seconds

 

[Josh22855]

I found out that these aftermarket stroker cranks require a $20 pilot sleeve for the torque converter. I am hoping this was the cause of the transmission destruction. Here are a few pictures of the destruction, viewer discretion advised .