03 4T65E slipping in 1st - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 09-29-2010, 01:41 PM   #1
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default 03 4T65E slipping in 1st

Just talked to Bob. The transmission now slips in 1st gear. He never really got on it till now to see how it works. This is for my L67 swap. The trans came out of a 3100 century with 86k miles.

Engine mods are 3.4, CAI, headers, high flow cat and 2.5" catback exhaust.

Any ideas? Bob'* guess is that it could be not enough pump pressure in 1st gear so he'* thinking of increasing the pressure and seeing if that helps anything. All other gears work perfectly fine. He even sent me a WOT video from 35 to 70 in 2nd and 3rd gear and no slipping at all.

Anyone run into this during engine swaps? Transmission really only has 86k on it according to where I bought it from and they said they were able to drive it in 1st and 2nd and it didn't slip at all, but for him its slipping even at medium throttle.

Update: he just laid a 30ft stretch of tire marks in 1st gear. He'* thinking it is the pressure. Any ideas?
xtremerevolution is offline   Reply With Quote
Old 09-29-2010, 01:46 PM   #2
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Ok, so now he'* not sure if the transmission was actually slipping or if it was the tires roasting. The tires don't make much noise at all when they squeal.
xtremerevolution is offline   Reply With Quote
Old 09-29-2010, 01:50 PM   #3
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

What did he use for a pcm, wiring harness and tune? The tune is where he'* upping the pressures. But here'* something to consider, the input seal/piston etc is known to be an issue area in our transmissions.
BillBoost37 is offline   Reply With Quote
Old 09-29-2010, 02:37 PM   #4
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Quote:
Originally Posted by BillBoost37 View Post
What did he use for a pcm, wiring harness and tune? The tune is where he'* upping the pressures. But here'* something to consider, the input seal/piston etc is known to be an issue area in our transmissions.
99 Monte Carlo LTZ PCM, he made the wiring harness himself, and he'* tuning with HPTuners.

Someone else just pointed out that if the trans was slipping, it should throw a code, DTC P1870. He'* going to check the codes later.

The trans did have only 86k miles and was bolted to a 3100 Century, so its not like it was abused. I saw pictures of the car it came out of and looked like a complete old lady car.
xtremerevolution is offline   Reply With Quote
Old 09-29-2010, 04:55 PM   #5
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Quote:
Originally Posted by BillBoost37 View Post
What did he use for a pcm, wiring harness and tune? The tune is where he'* upping the pressures. But here'* something to consider, the input seal/piston etc is known to be an issue area in our transmissions.
I just realized something. Wouldn't a problem with the input seal/piston cause an issue with slipping in all gears and not just first?
xtremerevolution is offline   Reply With Quote
Old 09-29-2010, 08:42 PM   #6
Senior Member
Posts like a Northstar
 
Join Date: Oct 2009
Location: Boston Mass
Posts: 684
Thanks: 0
Thanked 0 Times in 0 Posts
sgp358 is on a distinguished road
Default

Yes it would as the input clutch is on past 1st gear.
sgp358 is offline   Reply With Quote
Old 09-29-2010, 11:35 PM   #7
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Quote:
Originally Posted by sgp358 View Post
Yes it would as the input clutch is on past 1st gear.
An update for you guys. No code showed up, all other gears shift fine, and he'* going to raise the pressure and try it again tomorrow. He said his Impala did the same thing for a while and raising the line pressure fixed it. Here'* to hoping it does the same for me.
xtremerevolution is offline   Reply With Quote
Old 10-03-2010, 04:58 PM   #8
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Alright, so it seems that when the car is cold, gears engage really harshly. Its more of a jolt than anything. However, I let it sit and went inside to buy something at Target, then came back out, and it was shifting fine. However, it started its stupid light stutter/slip under acceleration from a dead stop. Bob told me his 06 Impala does the same thing. It doesn't do it at any other time except from a dead stop, and even then its not all the time. All the gears hold perfectly fine, and even 1st gear is perfectly fine is you're moving.

I'm not sure what it could be. I'm considering removing the transmission cooler as it seems that the transmission started getting a lot better once it warmed up, and that took a good 3-5 minutes.
xtremerevolution is offline   Reply With Quote
Old 10-03-2010, 05:27 PM   #9
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default

Just out of curiousity, what torque converter did you use?
95naSTA is offline   Reply With Quote
Old 10-03-2010, 05:42 PM   #10
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Quote:
Originally Posted by 95naSTA View Post
Just out of curiousity, what torque converter did you use?
The torque converter off the 3100 that the transmission came with. I used it because it presumably had a higher stall speed...
xtremerevolution is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
4T65E - 1st gear slipping 2005 Buick Terraza 2WD 95000 miles zchizhov Performance, Brainstorming & Tuning 8 06-07-2013 08:19 PM
2002 4t65e-HD into 1999 4t65e? buckykattnj Performance, Brainstorming & Tuning 6 02-15-2011 07:36 AM
4T65E-HD to 4T65E swap? woodturner2 General GM Chat 2 11-15-2010 08:53 AM
1st show 1st place in SSEi TaylorD Audio (and aftermarket electronics) 13 09-02-2003 06:31 PM
DTC P1870 (Transaxle Component Slipping (4T60-E Trans) throb 2000-2005 3 04-17-2003 02:48 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 08:21 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.