Engine/Transmission (1998.5 - 2002) RPM drop going in lockup?

[cummin2pass]

I don't want to start war on whose transmission is better.

I have read where some people say the rpm drop is only about

200-300 rpm during lockup.

I was watching mine and it drops about twice that much.

Is that good or bad?

Is that something to do with the line pressure or TC?



Thanks for any help; I'm trying to understand this.

 

[illflem]

200-300 is about normal.

Could be your transmission is slipping excessively when not locked up.

 

[fox]

With a DTT converter you would see about half of what you see now.

It is not the line pressure that effect stall/slippage but the design of the converter.

 

[cummin2pass]

illflem

The transmission is newly rebuilt. I don't think it is the problem.

It does very good.



fox

That is what I thought but didn't know.

I can tell allot of difference from the stock TC and this one

on a slow start.

If I take off fast it is more like the stock one.

Do you know how to come up with the % TC it is?

 

[RCone]

Call BillK at DTT. Should not drop in RPM's that much.

 

[fox]

Rcone, he does not have bills converter. It is an aftermarket.

A friend has an aftermarket one and it has held up very well but is a loose converter.

A loose converter is a little quicker to spool a big turbo but once it spools the tight converter is the cats meow.

 

[RCone]

Right Fox. My error. I just rechecked his sig. I picked up on the fact that he had a DTT transmission upgrade but I obviously didn't read far enough wherein he stated that he had a non-DTT TC. Well then, you are right, his RPM drop is normal and the only way to fix that would be to go to one of the big boys aftermarket TC.

 

[cummin2pass]

RCone and fox.

It is not a DTT TC.

It is a after market but not a name brand.

It was made to have a 400 rpm lower stall but just a little better than stock on the rest.

I didn't know how a DTT or other proven brand TC did on take off.

 

[cummin2pass]

I wanted to ask the question in a different way.



Lets say my lock up drop in rpm is 600.



Then say the 89% DTT is 300 rpm.



Would it be that the 91% would have even a smaller rpm drop.



And the same for the 93%.



I know mine isn't the top of the line, but just the drop in lock up is the differance in the stall?

I'm trying to learn. All I ever read on the TC is the lock up.



Thanks for any more insite.

 

[fox]

You really need to call DTT to get it staight from them.

The 89% , 91% , 93% numbers are really just a number that DTT uses and is thier own in house reference number.

Ask them to explain it.