Engine/Transmission (1998.5 - 2002) Later shift wanted w/ my DTT

[snowracer69]

Hey all,



First off, let me say my DTT was setup by Fred @ Desert Diesel, and it was done perfectly for what I had at the time (PE Comp)... . but, the BOMB bug came and went, and now I have DD3's, 4" exhaust, and my KSB1-B. I think I'll be putting billet shafts in sometime, but not for a while, and I will have Fred probably reset everything to this setup when that is done... in the meantime, here's my problem...



My KSB1-B is barking something fierce EVERY TIME my pickup shifts into 4th gear, under light to medium accelleration. If I'm getting on it, trying to get +30 PSI, there is no problem, but if just pulling away from a stop sign or the like, when it hits anywhere between 15-25 PSI, the turbo will start chattering and barking and my boost will pop back and forth 3-5 PSI. I've talked to Kurt, and he says this problem has only been seen on 2 other trucks. My buddy Denis has the identical setup to mine and his does not do this.



Kurt's plan is going 2 ways... first we want to try to get my transmission to shift 200 RPM's later, so it will be spinning faster when it locks up in 4th (goes from 3rd lockup to 4th lockup on the shift). If we can't do this w/o dropping my pan, I'm going to be the test dummy for a different compressor wheel once I get to Phoenix in about 2 weeks.



Love my turbo, but it has this one annoyance... can I change the shift point from 3-4 w/o dropping the transmission pan?



Thanks, Josh

 

[Cummins4Life]

Here are some scans from the DTT instruction manual I got with my transmission, hope it helps.



WOT shift adjustment instructions

WOT shift adjustment pictures



Line pressure and mid throttle shift adjustment < You can adjust these without dropping the VB it just takes an allen wrench with the short end ground a little shorter to fit between the VB and the case.



HTH

-Zach

 

[Piston Slapper]

Most Excellent Post! Thanks for the pics. . have been wanting these! You rock!

 

[Stefan Kondolay]

If you adjust your kick down cable it affects all your shifts. The least affected is your shift into 4th. 4th and lockup are electronically controlled by the pcm. The best way to proceed is to simply lie to the computer. I am not sure how Bill does it, but if you give him a call i am sure he will give you a hand with it.