I just unloaded my latest bomb.a dtt 518a with a 91% l/u tq. the only problem is I wont be putting it in till next weekend

 

thats awesome, let us know how you like it once you get it in, DTT is awesome.

 

Cool! like rockjeep said, KEEP US UPDATED!! I`m dying to know how nice it is (I bet REALLLLL nice). I`m esp interested in how the truck leaves a stop with the 91% verter.

 

You said 518 with a lock up converter, arent those trannys rare? What year is your truck, or the transmission that you had built?

 

keep us posted! thats the next thing I want to do on my 90

 

Not a full lock-up Rock, it's a 91% lock-up.And I am also interested in the holeshot Chris.God almighty I cant wait.

 

Usually "lock-up" implies a full, 100% lock-up, correct? That 91% would apply, to I guess, "lock-up" or something... (How would you differentiate?) Anyways, I don't think any 518's had lock-up, but it's not like you want full lock-up, do you? It ain't needed in the quarter.


I'm saving for a tranny too. Can't wait. So far my savings' account balance reads, err, -200.00 dollars...


And now that you have a tranny, you can tweak to your hearts content and not worry about grenading anything. Awesome...

 

Full lock up would be nice for sure, just think, you can put 100% of the power youre making to the ground, plus better fuel mileage, and you wouldnt have to run such a tight converter because you would have the lock up to fall back on, and yes a full lock up will result in better times at the track. I have heard rumors of rare 518's with lock up converters from the factory in 93's? I have yet to see one and DTT doesnt seem to know anything about them. I think if you want a lock up converter in a 1st gen you have to go to a 47rh.

 

I think the lock up 518 is an urban legend,lol.

 

I think so too, but then there are still those few who tell you that they exsist

 

Actually you can make a 518 a full lock-up, but you need a 47 rh, and a 518 for donars.then you have to run a valet switch in the cab to control lock-up. I've been running this one through my mind for quite some time now. If I can come up with some personal knowlege in that department I will try it beings I have a 518 and 47rh in the shop.By the way, If I said that I had a 91% 518a, or a 518 a with a 91% converter,I wonder which parts would be missing to make it 91%

 

There is no reason to make an A518 into a lockup when you have a 47RH laying around. The 47RH is the exact same length as the 518, bellhousing adaptor is thicker to make room for the lockup clutch in the converter.

I put one in, looking for a deal on another one to do it another one of my trucks.

 

JD, does the 205 fit on the 47rhor do you have to do something there. I dont know what transfer the 2nd gen's used.I told you I needed more knowlege in this department, so keep it flowing.

 

The 2nd gens use like a np241 chain drive T-case and is a drivers side drop. Our np205 t-cases, which are way strong, will bolt up to the 2nd gen trannies. You just have to mate an automatic np205 to an automatic tranny. I.E the np205s in the automatic have a 23 spline input shaft and a 29 spline input shaft when they came behind the manual trannies. The 2nd gen autos were 23spline output and the manuals were 29 spline outputs also.

Oh and they will all bolt together fine, you may have to remove the input or output seal or something but then you just have to make sure and seal the bolting flange.

Make sense?

 

No Problem,

NP205 bolts right on, there is a seal that has to come out of the OD unit in the back if it still there from the 2nd gen transfer case. Seal up the joint with RTV. Don't try to put one on alone without help, heavy buggers they are. And you'll have to hack your 4x4 lever bracket alittle to clear the the reenforcing webbing around the 1st/rev. servo.

Like I said before, you need the newer bellhousing adaptor for the additional thickness, about an inch, for the lockup clutches. Don't use your 1st gen flex plate over again. Lockup will deffinately kill it. You'll also need a new starter as they changed the pattern slightly. This will be a 2nd gen starter.

Like you said before, you have to use a switch for lockup, that will work fine. Getting the right connector make the job so much easier too.

Lengthen the slots in the transmission mount plate to accomadate the additional thickness of the bellhousing adaptor.

Drive shafts might have to been modified, I didn't. I only relocated my carrier bearing with some flat stock.

Don't skimp on the trans, It took only 14,000 miles to kill mine in stock form. A good torque converter and valve body will do wonders.

That should be enough info to get one into a truck.