Another 700R4 oopsie... help!
Thread Starter
Melting Slicks
Joined: May 2007
Posts: 2,382
Likes: 2
From: Kathleen FL
I'm gonna have to rethink of where I wanna go. So the old transmissions have no lock up for streetability. 700R4s will break under high rpms unless built correctly with higher rpm capability. The cost might be a lot more than I'm willing to put on a tranny. Torque converters can and will break if spun to the upper limit. T5 manuals are just plain weak, at least from my experience. T56/ZF6 manuals could stand a beating, but are much more expensive to build than an auto. A powerglide would cost more than this car as it is right now. I'm quite surprised my 10 bolt didn't break yet, but then again, my 60' times aren't exactly something to be proud of. Decisions decisions decisions...
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
I'm gonna have to rethink of where I wanna go. So the old transmissions have no lock up for streetability. 700R4s will break under high rpms unless built correctly with higher rpm capability. The cost might be a lot more than I'm willing to put on a tranny. Torque converters can and will break if spun to the upper limit. T5 manuals are just plain weak, at least from my experience. T56/ZF6 manuals could stand a beating, but are much more expensive to build than an auto. A powerglide would cost more than this car as it is right now. I'm quite surprised my 10 bolt didn't break yet, but then again, my 60' times aren't exactly something to be proud of. Decisions decisions decisions...
All reasons why I personally avoid high rpm combinations.
Decisions, decisions.
Pro
Joined: Oct 2007
Posts: 679
Likes: 4
From: TremontonUT UT
I am from the old school and I mean back when we were building 301s out of 283s. I was there when the 302 came out. Transmissions are the tip of the iceberg of the things that will break at those RPMs in a street rod. Later! Frank
Thread Starter
Melting Slicks
Joined: May 2007
Posts: 2,382
Likes: 2
From: Kathleen FL
Don't really think that is an option for a 10 bolt. Plus if it was, the ring gear teeth would be so thin the sorry thing would just blow to pieces if you dead hook. Heh, I have 3.73s on it and even with a 4000 stall, I'm still cutting 2.00 60' times at best. Oh and that's with some bogging. At least this thing revs higher than all of the VTEC Hondas every kid likes. 
I'll probably end up getting tired of this motor and part out the rotating assy. and put a stockish crank back in if worst comes to worst. For now, I'm gonna call it a rev happy money pit.
I'll probably end up getting tired of this motor and part out the rotating assy. and put a stockish crank back in if worst comes to worst. For now, I'm gonna call it a rev happy money pit.
Thread Starter
Melting Slicks
Joined: May 2007
Posts: 2,382
Likes: 2
From: Kathleen FL
Thread Starter
Melting Slicks
Joined: May 2007
Posts: 2,382
Likes: 2
From: Kathleen FL
With how bad my 60s are, I'm thinking that my set up might not have enough torque to even worry about it.
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Thread Starter
Melting Slicks
Joined: May 2007
Posts: 2,382
Likes: 2
From: Kathleen FL
Sad day. From what it looks like the rear planetaries went first and basically all the gear pieces from the planetaries mangled up everything from there. I can't even identify the pieces of clutch bands. Should have taken pics, but unfortunately I forgot to bring the camera with me... durrr. Cut my finger open when putting the crap back together so I'm quitting for the night. I guess this transmission is nothing more than a piece of $2200 metal scrap. Maybe I can use this as a core for my next transmission project. I think it is also time for this motor to go. It was nice while it lasted. Anyone wanna make me an offer on this 8500 rpm mill?
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
I have never seen a combo that put 8500 rpm through a 700r4. They tend to centrifically apply the clutchpacks when pushed above 6500. Transgo has higher tension springs that help prevent that, and should be considered on a future build. If you still have a stock size, and weight converter, it can be deadly to a super high rpm package.
Speculating what you broke is not nescessary. Sounds like you broke it bad, for lack of a more technical reply. Take it apart and inspect the carnage. You likely destroyed the rear planetary assembly, reaction shaft, and reaction shell at a minimum. The internals of the pump may have shattered as well.
If you did suffer hardpart failure, the converter is junk too.
Speculating what you broke is not nescessary. Sounds like you broke it bad, for lack of a more technical reply. Take it apart and inspect the carnage. You likely destroyed the rear planetary assembly, reaction shaft, and reaction shell at a minimum. The internals of the pump may have shattered as well.
If you did suffer hardpart failure, the converter is junk too.
Advanced
Joined: Nov 2007
Posts: 79
Likes: 10
Likely it is the transmission because of the noise while idling.
However with no park it could be the rear-end also.
Put it in part and look under while pushing a foot or so, see if the driveline is turning. If it is rebuild the transmission.
Best of luck.
However with no park it could be the rear-end also.
Put it in part and look under while pushing a foot or so, see if the driveline is turning. If it is rebuild the transmission.
Best of luck.
