|
|
Veteran
Posts: 158
 
Location: Ottawa, ON | Hi,
my Dodge recently developed the following problem: When the engine (and the transmission) is cold (around 59°F/15°C) the part throttle upshift 1-2 happens really late at aorund 20-15 mph followed directly by the 2-3 upshift. both shifts seem to be fast and direct. i also have the feeling that when still cold also the breakaway from standing to driving is a little softer and takes more rpm.
as soon as the engine is warmed up, everything is fine.
kickdown and reverse work fine.
ATF looks and smells as new, i changed it around 1000 miles ago and adjusted the bands according to specs.
the kickdown/throttle linkage might be a bit "floppy" due to missing rubber bushings but worked like this for the last 3500 miles, the problem just occured recently.
any suggestions what to check?
thanks!
|
|
| |
|
Expert 5K+
Posts: 7409
 
Location: northern germany | i suggest replace the missing rubber bushings immediately as the t flites are very sensitive when it comes to linkage adjustments. make sure there is absolutely no free play in the linkage. not sure if that fixes the problem but i would start with a transmission that is adjusted up to specs and work from there. |
|
| |
|
Veteran
Posts: 158
Location: Ottawa, ON | Hey sid, I will do so as soon as possible. Though I don't quite get how a misadjusted linkage could result in a temperature dependant Problem? I thought it could have something to do with the pressure because the only thing that changes is the viscosity of the atf or am I completely wrong on this? |
|
| |
|
Expert 5K+
Posts: 7409
Location: northern germany | yep its unlikely that the linkage bushings are the culprits if the transmission shifts fine at operating temperature but i'd always start with a transmission that is adjusted up to specs. in theory the missing bushings change the throttle lever adjustment and shiftpoints and this could cause transmission damage in the long run. i even stiffened the kickdown lever linkage/improved the bushings as i found out these makes a noticeable difference.
Edited by 1960fury 2015-09-15 9:34 AM
|
|
| |
|
Veteran
Posts: 158
Location: Ottawa, ON | I'll see what I can do next time i'm lying under my car. :-) |
|
| |
|
Expert
Posts: 3575
 
Location: Netherlands | I would pull the oilpan and have a look at the filter.
A partly clogged filter could perhaps slow down oilflow at colder temps, when the ATF is slightly thicker.
|
|
| |
|
Veteran
Posts: 158
Location: Ottawa, ON | ok thanks, i will check that too! |
|
| |
|
Board Moderator & Exner Expert 10K+
Posts: 13054
Location: Southern Sweden - Sturkö island | To me it sounds like an internal leakage when the seals are cold and hard. Try some Omega 917 seal saver and see if that helps. http://www.lubrite.co.za/wp-content/uploads/2013/10/odis917.pdf
|
|
| |
|
Veteran
Posts: 158
Location: Ottawa, ON | I'll try to adjust the linkage, see if i can build a new bushing out of a tire valve or something similar, test the transmission, if the problem is still there i'll drop the pan and clean the strainer (although i really hope there should be no debris whatsoever, hence the recent oilchange) and if this doesn't help i'll try the omega stuff. Wizard, do you have an advice how to use this seal saver? like how much to put in there and for how long? just in case...
|
|
| |
|
Board Moderator & Exner Expert 10K+
Posts: 13054
Location: Southern Sweden - Sturkö island | It's a small bottle of 177ml (6 ounces) and you just pour it down the filler neck. The Omega will blend with the transmission fluid and soften up all rubber seals.
Since it's not cheap, be sure to change the transmission fluid before you pour in the Omega 917 (that's if you intend to change it) |
|
| |
|
Expert
Posts: 3778
Location: NorCal | wizard - 2015-09-15 8:13 AM
To me it sounds like an internal leakage when the seals are cold and hard.
That was my first thought too. |
|
| |
|
Expert
Posts: 3575
Location: Netherlands | My reasoning was that hardened seals would not show up all of a sudden, unless one of them broke perhaps.
The transmission in my '57 Chrysler always had a very very, really verrrry slow engagement when putting it in Drive everytime I started it cold.
In the beginning it actually took up to 20-40 seconds before the trans would engage after pressing the Drive-button.
Knowing the transmission would most likely be up for an overhaul, as a test I've poured some amount (1 or 2 cups) of brakefluid into the transmission to see if that would soften/swell up the seals.
The engagement time of the Drive-button has been shortened to 5-10 seconds now...
|
|
| |
|
Veteran
Posts: 158
Location: Ottawa, ON | :-/ hardened Seals sound like a near future rebuild. I can not really get familiar with that idea. ;-)
I guess i'll try everything else first, then try some "magic in the bottle" and if that doesn't work I think I know what to do over the Winter...
Thanks a lot anyway to all of you guys! |
|
| |
|
Expert
Posts: 2312
Location: Arizona | I got my 89 700R4 to keep going several extra years and about 20K extra miles by using different "magic in a bottle" stuff. Most of the stuff will soften and swell the seals to reduce the amount of internal leakage past them. I also put in 2 bottles of STP oil treatment to make the ATF "thicker" when hot. That also helps ensure the clutch packs can build up enough apply pressure. I've use the stuff in several vehicles and it's never caused any problems as far as I could tell.. either it helps or nothing changes. |
|
| |
|
Veteran
Posts: 158
Location: Ottawa, ON | Turns out Sid was right, although I have no idea why the transmission shifted right when it was warm. Anyway, I made new rubber bushings, adjusted the linkage and now everything works fine, cold and warm. Thanks for all the advice! |
|
| |
|
Expert 5K+
Posts: 7409
Location: northern germany | glad to hear that! |
|
| |
|
Board Moderator & Exner Expert 10K+
Posts: 13054
Location: Southern Sweden - Sturkö island | Really good that it worked with new bushing and adjustment - less is more in this case! |
|
| |
|
Veteran
Posts: 158
Location: Ottawa, ON | Yes, I am also really happy that it was something so simple (and cheap). :-) |
|
| |
|
Board Moderator & Exner Expert 10K+
Posts: 13054
Location: Southern Sweden - Sturkö island | A bottle of Omega will only do your transmission good, see it as preventive maintainence |
|
| |
|
Veteran
Posts: 158
Location: Ottawa, ON | I'll try it when the next ATF exchange is due, so I'll get most benefit from it....although I don't really trust any "magic in the bottle". |
|
| |
|
Board Moderator & Exner Expert 10K+
Posts: 13054
Location: Southern Sweden - Sturkö island | You need to get over that treshold my friend  I was totally against all "miracle formulas" before, but I have changed my mind - there are good stuff (and then theres totally wortless crap).
I have tested several products and recommend and sell the good stuff to a close circle of friends.
Omega 917 is one of those Products...... |
|
| |
|
Veteran
Posts: 158
Location: Ottawa, ON | As I said, I will try it. Only because I trust your expertise ;-) |
|
| |
Late 1-2 upshift when cold
