Suncoast converter on a DTT trans?

[Swayse]

My DTT converter is slipping in lock up, I've only got a few thousand miles on it. From the big HP guys I have talked to, this is normal for a single disk not too hold very long. So I'm thinking of going with a suncoast converter on a DTT trans, 3 disk or a 5 disk, I'm not sure yet. I wish DTT made a 3 disk or a 5 disk converter, I hate mixing brands.



I'm not really sure why I'm posting, I just wish I would have known that the DTT converter couldn't handle much HP for very long, I would have gotten a Suncoast trans instead. Just a heads up if you plan on making big power and using it.

 

[Fred Swanson]

Swayse, you need to discuss this with Bill, somethings not right. I've had more than a few high HP trucks holding with their TC without incident.

 

[zstroken]

Give Goerend a call. He has a sweet low stall triple disk.

 

[Jetpilot]

My DTT converter is slipping in lock up, I've only got a few thousand miles on it. From the big HP guys I have talked to, this is normal for a single disk not too hold very long. So I'm thinking of going with a suncoast converter on a DTT trans, 3 disk or a 5 disk, I'm not sure yet. I wish DTT made a 3 disk or a 5 disk converter, I hate mixing brands.



I'm not really sure why I'm posting, I just wish I would have known that the DTT converter couldn't handle much HP for very long, I would have gotten a Suncoast trans instead. Just a heads up if you plan on making big power and using it.

Hmm,



Lets see our shop trucks makes over 830 RWHP and runs a DTT setup with no slippage. Then there was my old p-pumped 24v that made right at 900 RWHP it too was DTT and had no slippage. There was also my 01 truck that ran a DTT but it was only around 750 RWHP and it too had no slippage..... Jim Julmer runs a DTT transmission and he has over 870 RWHP and no problems.



This being said I know of no other converter that is holding the amount of HP that a DTT unit does. I would call Bill K. @ DTT and discuss the problem. A DTT transmission/TC will hold the HP with no problems so something is going on.



Doug

 

[Bandit1]

i agree dtt is holding the highest hp trucks around and still going strong, something else is going wrong inside that trans. do you have an entire upgraded trans or just a tc and vb?

 

[Swayse]

I've got the whole trans, billet in and out but not middle. Billet 3rd gear drum, 48RE valve body. Guys, I'm sure it's good torque conveter, I don't think it can handle trips down the track. I go 1,2,3 unlocked, then hit lock up in 3rd at 3000 rpm, and at first the rpms would drop down to 2300 to 2400 and the motor would just roar, when the converter was new. But now it'll only drop to about 2700. When I'm running down the road in OD, lock up torque converter with a switch, hold it back with the brakes and the rpms will go up 200 rpms instantly and go back down when I let off. I'm in contact with DTT.

 

[Cooker]

I agree, something doesn't seem quite right?

 

[RBratby]

i thought when you hit the brakes the trans would unlock. my 95 w/ a dtt auto did. if i was driving down the road with the converter locked i touched the brakes it would unlock. then when i let off it would lock back up.

 

[rockjeep73]

as far as i know, the converter WILL unlock when you hit the brakes driving down the road, so that does not mean that your lockup clutch isnt holding.

 

[RBratby]

i was not trying to say that his clutch was not holding. i was saying that if you hit the brakes the rpm will raise about 200 rpm. he said he goes into lockup and holds the truck back with the brakes. as soon as he hit the brakes the rpm would go up about 200rpm. when he let off the brakes it would go back down.

 

[CumminsAholic]

I dunno If I'm reading it right, but it seems like he's saying with a lock-up switch on he can hold the brakes and the converter will slip the 200 rpm? Does a converter unlock when you hit the brakes even with a lock-up switch? I dunno as I don't have a lock up switch... . yet.



I agree something's not right though, it will not slip if it's right.

Corey

 

[Jim Fulmer]

Jetpilot is right I haven't had any issues with slipping... . ever. What I can do though is back off on the TV all the way and make it do what feels like slipping... ..... long ago misadjustment. It will more than likely be an adjustment that is needed. Locking the converter with a switch and holding against the brakes going down the highway is not a good thing anyway but sometimes needs to be done for the tailgaters :-laf



Jim

 

[Swayse]

TV cable is still where it should be, it still shifts like it all ways has. The converter don't have a lot of miles on it, but it has seen quite a few runs down the track, at least 50. I did feel the converter getting soft before my nitrous runs, but the nitrous slipped it bad. I've never had the trans over 190 degrees.



It's kinda like a single disk clutch that South Bend sells, it's rated for 550 hp, but it won't hold long in a 400 rwhp truck if you speed shift alot, and they tell you that too. My truck makes a little over 600rwhp, and the converter did really well at first. But slowing the engine down from 3000 to 2300 under full power, something has to give.

 

[Forrest Nearing]

I thought DTT you weren't supposed to do locked shifts

 

[Jetpilot]

It's kinda like a single disk clutch that South Bend sells, it's rated for 550 hp, but it won't hold long in a 400 rwhp truck if you speed shift alot, and they tell you that too. My truck makes a little over 600rwhp, and the converter did really well at first. But slowing the engine down from 3000 to 2300 under full power, something has to give.

Something is not right..... All of my trucks mentioned above were raced at the track numerous times running tons of fuel + nitrous and locked shifts with no TC slippage. What did Bill K. say about things?

 

[I-6DZL]

Who built/Installed the unit????



The trans is only as good as the install... ... .



I think Jim Fulmer and Doug have more than proved how well DTT trannie's perform.



If you really want to know if the TC is slipping hook up to a heavy load and get right after it all the way through lock up.



Does the truck shudder after you hit the L/U switch ?



Curtis

 

[Swayse]

Now you guys have got me thinking. Maybe my trans has never been right. I'm on my second DTT. The first one had a bearing problem, it started to hang in the gear when you put it in N or P, it would just sit there chugging in gear, in park for awhile, then it would slip out, and sometimes I had to kill the motor before it would release the gear. And it also didn't wanna go in gear, unless you reved it up a bit. Changed oil and there where lots of metal shavings in the oil. I took it back to my DTT installer, and he tore into it. Found that a plug had come out of the middle shaft and that had starved a bearing of oil and that took out the bearing. I paid to upgrade to a 48re valve body, and paid to go to a higher stall converter. Installer made me a real good deal on labor. $1500 bucks and I was back on the road. My DTT rebuilder/installer is 600 miles from my house, I really hate to go all the way back up there if I can just slap a converter on it and call it good, but now I don't know.



I haven't driven the truck since I found out how bad the converter was slipping, I'm afraid it will take out the rest of the trans filling it with trash from the converter.

 

[Bandit1]

good thought on not driving it until it is right. with the vb you have and pressures that it runs (i have the same setup plus gauges to monitor presures) there is no way that the trans is correct. something is out of "line", there are so many parts in the trans and all have to work "in line" with each other for the trans to be bulletproof. get ahold of bill k. he is the designer of that beast and will know what is going wrong. post your findings.

 

[c-hawk]

I've got the whole trans, billet in and out but not middle. Billet 3rd gear drum, 48RE valve body. Guys, I'm sure it's good torque conveter, I don't think it can handle trips down the track. I go 1,2,3 unlocked, then hit lock up in 3rd at 3000 rpm, and at first the rpms would drop down to 2300 to 2400 and the motor would just roar, when the converter was new. But now it'll only drop to about 2700. When I'm running down the road in OD, lock up torque converter with a switch, hold it back with the brakes and the rpms will go up 200 rpms instantly and go back down when I let off. I'm in contact with DTT.

I run very similar times to you and i've got 80000 miles and hundreds of runs at the track. Like the others who have posted here i've never had any slippage. My trans sounds about exactly like yours and i lock in third with a lock-up switch. I believe something is not right in the setup. Once the setup is right it will definitely hold.

 

[c-hawk]

I dunno If I'm reading it right, but it seems like he's saying with a lock-up switch on he can hold the brakes and the converter will slip the 200 rpm? Does a converter unlock when you hit the brakes even with a lock-up switch? I dunno as I don't have a lock up switch... . yet.



Corey

With a lock up switch it will not unlock, period. If your running in O/d locked and try to stop without unlocking it will be like trying to stop a manual truck without pushing in the clutch. Once i hit my switch by accident and didn't realize it. When i put the truck in gear it stalled it out. I put it back in neutral and started it up. Dropped it in gear. It died instantly. Then i figured out i had hit the switch. Oops.



Chris