Transmission Problems [Archive] - GrandAmGT.com Forum

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Rogue9
01-11-2007, 05:11 PM
My transmission is surging/slipping when I'm accellerating. It's a moderate acceleration, it'll do it at slow acceleration with a load as well. (eg uphill)

Between 1000-3000 it'll sound and feel like its grabbing and slipping.
What kinda problem do I have? do I need a rebuild? I think I've heard clutch packs mentioned before?

I'm at about 190,000 KM's.
I do fluid/filter change every1 - 2 years.

I don't think it's the engine because I have no idle problems Only in gear.

Thanks.

gectek
01-11-2007, 06:05 PM
ok so what rpm does the trans surge to like when you have it driving in drive, which should be about 1800 or so at 60...what rpm will it surge up to? a few hundred or a few thousand?

Rogue9
01-12-2007, 10:58 AM
it'll only surge a few hundred.
like if I'm accelerating it'll be fine till about 1000-1500 then it'll start slipping then grabbing, then slipping and grabbing. It's not rough it's pretty smooth but you feel it and see it.

gectek
01-12-2007, 11:42 AM
ok so if it is during acceleration, then it will be your clutch packs, but if it is during cruising then it is either 1 of 2 things, either the torque converter clutch is slipping(which would mean a new torque converter and a fluid change...again) or the tcc solenoid, or a combination of the 2. so that will kind of narrow it down for you. i would go to a good repair shop or the dealer and have them pull any current code right when it slips, and let them go on a road test with you. if you pull any codes while you are driving, that should tell you more. if you dont and you see the input shaft speed is the same as the output shaft and the tcc is showing as applied then it could possibly be the tcc clutch. it is either of those 3, not of course it could be a leaking seal, but that would still result in fried clutches, so thats not good either.

if you can get any of that done, then get back to me with the results and i may have some solutions for you

on a side note, if your trans throws codes like p1870 or anymore trans codes, they dont always have to throw an SES light, but they can still store in your comps memory, thats why i say have a good scan tool to pull codes

Rogue9
01-12-2007, 04:43 PM
nope no engine codes. I got a scanner. I'll bring it to the dealer next week I guess.
and no the dealer doesn't screw me over.
Not when my mom works upstairs. lol...

gectek
01-12-2007, 06:40 PM
ok so when i read back over your post it says when you accelerating correct, it only slips when you are accelerating, so it is prob the clutches or a bad bonded piston letting fluid leak by. looks like a rebuild...srry

Rogue9
01-23-2007, 09:49 PM
Got it fixed.
$550 canadian later...

it was a clutch solenoid going wrong.
thanks all!.

gectek
01-23-2007, 10:00 PM
ok well that didnt say much, but it was prob the tcc sol. yah thatll cause sluggishness and dieing and bad driveability, because the tcc will apply without reason and bog the engine down, then release and the engine will surge back up with the power added back that was taken away by the tcc apply

Sprucegagt
01-23-2007, 10:45 PM
It was the pressure control solenoid. They are known to go bad in the 4T45. Mine would be doing the same thing if it wasn't for my Powrtuner.

gectek
01-24-2007, 12:08 AM
well i have seen alot of the tcc solenoids go wrong, and itll provide a slight disengagement of the tcc giving a rev in rpm

MMGT1
01-24-2007, 01:46 PM
It was the pressure control solenoid. They are known to go bad in the 4T45. Mine would be doing the same thing if it wasn't for my Powrtuner.


Just wondering what you did in your tuner to fix the problem?? How did you go about it?
..curious?? Maybe you can help all of us save a couple of bucks:)

Sprucegagt
01-24-2007, 02:25 PM
Well I'll be honest. It's more of a band aid fix than anything else. The only thing I did was up the 1-2 and 2-3 shift pressures. 1-2 in particular were seriously raised up. It is not a perfect fix because when my trans. temp exceeds 150 *F, it will slip on the 1-2 shift. So during the winter it's not a problem, but next summer it will be.

MMGT1
01-25-2007, 09:51 AM
HA HA HA.........sound like we are in the same boat! I've done the same thing with my tuner. Just seeing if there was something I had missed.
Thanks for the reply Andy :)

What setting have you gone with? This is what I have....

Foot pounds %pressure

20 2
40 6
60 15
80 19
100 21
120 27
140 31
160 50
180 56
200 62
220 67
220 67
240 72
260 76
280 82
300 86
320 91
340 93

Above that it is @ 96.....
These are the 1-2 shifts

MMGT1
01-25-2007, 09:54 AM
Your trans gets above 150*?? About 130 is as high as mine goes. What t-stat you running? Saw a dramatic drop in trans temps when I went with the 180* t-stat. Takes quite a while to get it abouve 100* now...

Sprucegagt
01-25-2007, 11:14 AM
I don't live in Canada so winters here are no where near as cold as they get for you. So I do see trans temps at or slightly above 150* but only after extended periods of city driving. Normally on the highway it stays around 135-140*. Now in the summer I have seen it jump up to 180*. This is with 180* t-stat and B&M trans cooler. As for my pressures I'll post them up later. I don't have my laptop with me at work.

gobraves00
07-17-2007, 09:36 AM
sorry to bring an old thread back up, but im getting p1870 code and my temp gauge is maxing out when i get above 65mpg, whats the next step, please dont say a new transmission

Sprucegagt
07-17-2007, 10:21 AM
It could be.

P1870 - Transmission Component Slipping

2001gt
11-21-2016, 03:13 PM
My trans is doing sort of the same thing. Light-moderate acceleration when the cars around 45 MPH the rpm bounces from about a grand up to about 2k. And the car chugs like it's missing or wants to shift but wont. If u give it more throttle it gets a bit better. Trans has been shifting a bit harsh lately. Car has over 165k miles on it

sleepyalero
11-21-2016, 08:52 PM
Torque converter is bad. Happened to mine.