Engine/Transmission (1998.5 - 2002) Automatic Transmissions

[lebar]

Has any one had a DC Dealer come up with a fix for the neutral shift between 2nd and 3rd, and the delay into reverse? Mine is not that bad yet worse when cold



2002, 2500,4X4, auto

 

[LSMITH]

You are going to have to describe the problems you have in detail. Not sure what a nuetral shift is. Reverse should have no delay.

 

[lebar]

Auto Trans

The neutral shift is like double clutching a manual transmisson. Truck will be pulling in second gear then goes into neutral(RPM's go up as if truck is in neutral ) then shifts into third and pulls like normal. Reverse Truck starts to move, then acts as if you shifted into neutral (RPMS go up ) truck will then shift into reverse and continue without a problem. I hope this helps.

 

[inarush76]

Low fluid?

check fluid in neutral with engine running WITH PARKING BRAKE ON! First thing to check. Could be front clutch lip seal problem. Front clutch is used in reverse also. HTH

James

 

[lebar]

Auto Transmisson

Fluid Level is OK, Dealer has replaced valve body over a problem with the back up lights. I thought I read something about checking the pressures at three points to see if there is internal leaking. Will these test point to the lip seal problem

 

[inarush76]

pressure testing

Use of a gauge will tell you if there is a leak in the circuit. In the direct clutch circuit there are a number of areas that can be the culprit. There is the lip seals in the drum, the rings on the reaction support, the vavlebody to case, the front servo, etc. A known good gauge with a good hose(don't want hot oil bath in cab ) is needed. HTH



James

 

[lmills]

mine does it sometimes between 2 and 3, but I haven't had any trouble with reverse

 

[inarush76]

Pressure in reverse is considerably higher than forward and will often overrun the leak in the drum. The leak is still there, just not as noticeable.

James

DTT builder/installer

 

[TowPro]

my 02 don't do this. (it only has 5000 miles on it)

Yes it does have a very sloppy shift from 2 into 3, but the RPM does not rise during the shift.



And It goes into reverse quick. I have not tried reverse cold as I back into my parking spot. I did notice the OD lockout worked the other day, so did the 3 cyl idle, it was 12 when I started it (without being plugged in)

Originally posted by lebar

Has any one had a DC Dealer come up with a fix for the neutral shift between 2nd and 3rd, and the delay into reverse? Mine is not that bad yet worse when cold



2002, 2500,4X4, auto

 

[Rockcrusher]

The auto transmission does some tricky things 'locking' up between 2nd and 3rd and then 3rd and fourth. The older tranys didn't lock up.

I thought mine was going "crazy" until I took a drive with the transmission mechanic at the dealer. He's been around awhile and seems to know what he's talking about. Rare these days.

It is the worse in town around the 40 mph range. When you can stomp on it, its OK.



I went to a marine salvage yard in San Diego and got a 400 lb anchor to throw out so I can keep this thing under control. It has so much power its awsome.

 

[lebar]

Automatic Transmission

Thanks for the input so far, at least I don't have the only one. Does not do the neutral shift thing if I am driving hard, worse around town. I will be contacting the dealer to see if they have any answers yet

 

[HDH]

Have the dealer re-adjust the kick down cable, I had the same problem with mine. I re-adjusted it (i cant remember which way) and it has not done the double shift thing in 3yrs.

Ask Bill kondolay,Or go to his website, I think he may have the procedure posted there. www.dieseltrans.com

Hope this helps.

Doug.

 

[Lsfarm]

2nd-3rd Shift 'flare'

Hi lebar, actually your trans is probably just fine. Our automatic trans actually does several things when shifting from 2nd to 3rd. It has to release the second gear band, next [ believe it or not] shift into FIRST gear, then into third. [I'm pretty sure I have described this right. ]



If I remember my 'lesson' with Bill K, third gear has first and third clutches engaged at the same time. First gear clutches have to engage first, then the third gear clutches.



What you are getting is a slight 'flare' of rpm between the engagement of these clutches.



I may have this a bit wrong, if you want the straight scoop, call Bill K, or go their forums and read up on it, www.dieseltrans.com 1-866-504-4002



The slight flare that you are experiencing is actually desired, because this means that you are getting the correct sequence of events inside your trans. If not what can happen is a 'bind shift' where the clutches are engaged at the same time, [not in sequence], and the trans is for a moment binding internally, this creates very high wear and temperatures.



My DTT trans has this slight RPM 'flare' on the 2-3 shift under light throttle, but it is not there with lots of throttle. This is perfect according to Bill K.



When you get the 'hesitation' in reverse, is this the first motion you are requesting from the trans ? Say like backing out of the garage or parking space first thing in the morning? If so you are probably experiencing a bit of 'drainback' there is a check valve that leaks a bit, and allows some fluid to drainback into the pan overnight. If this describes your situation, just shift into neutral for a moment [before selecting reverse], this will circulate the trans fluid quickly, and you should not notice the hesitation as much if any.



I hope this helps. Greg L The Noise Nazi

 

[LSMITH]

Re: 2nd-3rd Shift 'flare'

Originally posted by Lsfarm



What you are getting is a slight 'flare' of rpm between the engagement of these clutches.



The slight flare that you are experiencing is actually desired, because this means that you are getting the correct sequence of events inside your trans.

I agree Greg.

 

[lebar]

Automatic transmission

The delay in reverse does happen after the truck has been parked for awhile. It has only happened a couple of times. The truck will start backing up a few feet, then acts as I moved the shifter to neutral. I will try letting it run in neutral first, and see what happens.



Thanks, Lebar