Trans slipping

[justabuickv6]

I am locking my CK 9x11 3600 up at the line so that it locks up in 2nd. I have ran with and without it locked and I picked up .2 in the 1/8 mile locked when the converter was new. The converter now has about 2500 miles on it and maybe 10 passes.

Either the tranny, converter lockup or both is weak. Can you advise?

12.07 pass
1-2 shift 5250. Dropped to 4750. Difference of 500 RPM.
2-3 shift 5275. Dropped to 4200. Difference of 1075 RPM.

12.15 pass
1-2 shift 5200. Dropped to 4775. Difference of 425.
2-3 shift 5175. Dropped to 4200. Difference of 975.

12.22 pass
1-2 shift 5650. Dropped to 4475. Difference of 1175.
2-3 shift 5500. Dropped to 4175. Difference of 1325.

12.23 pass
1-2 shift 5200. Dropped to 4450. Difference of 750
2-3 shift 5000. Dropped to 3775. Difference of 1225.

Viewing in DS, it's no longer a "saw tooth" pattern on the shifts. What are ya'lls thoughts?

I can no longer do WOT passes because it shifts and the shift light stays on because the RPM's never drop.

I haven't check it lately without locking up the converter.

[LV GN]

I am locking my CK 9x11 3600 up at the line so that it locks up in 2nd. I have ran with and without it locked and I picked up .2 in the 1/8 mile locked when the converter was new. The converter now has about 2500 miles on it and maybe 10 passes.

Either the tranny, converter lockup or both is weak. Can you advise?

12.07 pass
1-2 shift 5250. Dropped to 4750. Difference of 500 RPM.
2-3 shift 5275. Dropped to 4200. Difference of 1075 RPM.

12.15 pass
1-2 shift 5200. Dropped to 4775. Difference of 425.
2-3 shift 5175. Dropped to 4200. Difference of 975.

12.22 pass
1-2 shift 5650. Dropped to 4475. Difference of 1175.
2-3 shift 5500. Dropped to 4175. Difference of 1325.

12.23 pass
1-2 shift 5200. Dropped to 4450. Difference of 750
2-3 shift 5000. Dropped to 3775. Difference of 1225.

Viewing in DS, it's no longer a "saw tooth" pattern on the shifts. What are ya'lls thoughts?

I can no longer do WOT passes because it shifts and the shift light stays on because the RPM's never drop.

I haven't check it lately without locking up the converter.really need to know a few more things here. what is the rpm's at the end of the run going over the line? are they higher now then when the trans was working? how does locking it up effect the rpm's now? can you feel the shifts?

[justabuickv6]

The above info is with the converter locked. Locked on all passes.

The slower times were from about 6 months ago. The 12.07 pass was about 2 months ago.

At low RPM, I can feel the converter lock. Low RPM and no torque that is. Just normal driving around. At WOT, I can not tell that it is locked and the numbers sure doesn't show it either. I think I should get more that a 500 RPM drop when shifting from 1st to 2nd without locking it. Even more of a RPM drop with it locked.

Highway driving, I can lock the converter manually and it takes exactly 5 seconds before it actually locks. I can feel it. When I release the lockup manually, it unlocks immediately.

12.23 pass trap RPM was 5000 at 110 MPH
12.22 pass trap RPM was 5100 at 110 MPH
12.15 pass trap RPM was 5300 at 110 MPH
12.07 pass trap RPM was 5400 at 110 MPH

[LV GN]

The above info is with the converter locked. Locked on all passes.

The slower times were from about 6 months ago. The 12.07 pass was about 2 months ago.

At low RPM, I can feel the converter lock. Low RPM and no torque that is. Just normal driving around. At WOT, I can not tell that it is locked and the numbers sure doesn't show it either. I think I should get more that a 500 RPM drop when shifting from 1st to 2nd without locking it. Even more of a RPM drop with it locked.

Highway driving, I can lock the converter manually and it takes exactly 5 seconds before it actually locks. I can feel it. When I release the lockup manually, it unlocks immediately.
12.23 pass trap RPM was 5000
12.22 pass trap RPM was 5100
12.15 pass trap RPM was 5300
12.07 pass trap RPM was 5400thats some good info. seems like a delay in locking up. really the next thing to do is drop the pan and look for any clutch or metal. it could be the converter is coming apart or the forward clutchs are starting to slip at wot. what stall is this converter? was it new when you bought it?

[justabuickv6]

The stall was new when I bought it. It's a CK 9x11 3600. It has about 10 passes on it and only about 2500 miles.

I rechecked my DS files.

12:07 pass RPM at 104 MPH was 5100. Shifted in to OD automatically. OUCH!
12:15 pass RPM at 107 MPH was 5100
12:23 pass RPM at 110 MPH was 4900

I've been working on the car so it is getting faster. The 12:23 pass was some time ago. The 12:07 pass was recently. I wonder what it would run with any slippage.

[LV GN]

The stall was new when I bought it. It's a CK 9x11 3600. It has about 10 passes on it and only about 2500 miles.

I rechecked my DS files.

12:07 pass RPM at 104 MPH was 5100. Shifted in to OD automatically. OUCH!
12:15 pass RPM at 107 MPH was 5100
12:23 pass RPM at 110 MPH was 4900

I've been working on the car so it is getting faster. The 12:23 pass was some time ago. The 12:07 pass was recently. I wonder what it would run with any slippage. thats a lot of stall. what turbo do you have? 110. mph @ 4900 rpm's sounds good but the higher rpm's at lower mph looks like something is going on. let me know when you get the pan dropped. does the fluid smell burnt?

[justabuickv6]

Tranny pan is full of shavings.

Turbo is a PT52. Stock block.

I went bigger on the stall for two reasons. 1) CK Performance suggested it. It really woke the car up. 2) because of the upcoming motor rebuild and maybe a bigger turbo one day.

[SVT F15O]

Sounds like it is time to yank that trans and do an inspection..........

[LV GN]

Sounds like it is time to yank that trans and do an inspection..........yes it does sound that way. how old is the trans?

[justabuickv6]

The tranny is stock. 100k miles.

I purchased the car about 3 years ago. It ran low 14's stock. I got it running 13.50's immediately and then just kept tinkering. Running 12.00's now. The tranny just finally gave up I guess.

[LV GN]

The tranny is stock. 100k miles.

I purchased the car about 3 years ago. It ran low 14's stock. I got it running 13.50's immediately and then just kept tinkering. Running 12.00's now. The tranny just finally gave up I guess. sounds like you got your moneys worth out of that one. youll be in the 11's in no-time. get a good build up and it will last a while. you may want to send the converter in and have it cut open and cleaned.

[justabuickv6]

My fastest pass to date was done on a slipping tranny. A 12.07 @ 110

I was looking back on my old DS files when the tranny wasn't slipping.

Shifting at 5100, on the 1-2 shift is 1350 RPMs different between slipping and not slipping.

Converter locked when the tranny wasn't slipping
1-2 shift 5100 RPM dropped down to 3400 RPM

Converter locked and slipping
1-2 shift 5100 RPM dropped to 4750 RPM

[LV GN]

My fastest pass to date was done on a slipping tranny. A 12.07 @ 110

I was looking back on my old DS files when the tranny wasn't slipping.

Shifting at 5100, on the 1-2 shift is 1350 RPMs different between slipping and not slipping.

Converter locked when the tranny wasn't slipping
1-2 shift 5100 RPM dropped down to 3400 RPM

Converter locked and slipping
1-2 shift 5100 RPM dropped to 4750 RPM you will get an 11 when the trans is working. that was a good time on a slipping trans.

[justabuickv6]

That's what I am hoping. I will have to wait for a little time before I can afford to rebuild it and the converter. Baby #2 is about ready to be born.

The tranny is fine as long as you don't go WOT.

[lost2a6]

I have a CK 3500 9X11 as well. My car had the same symptoms as yours. Started off great, then got waaay too loose, the engine stayed on 5500. I sent it back to rusty at TCS, he restalled it a little lower. I haven't tried it yet; I'm working on my tranny. My trans looks pretty good. Rusty said that the converter looked good. Not trying to start anything, but Rusty said that Chris had ordered several converters that was too loose in his opinion. :albert:

[justabuickv6]

Interesting. In my case, I don't really think it's all the converters fault.

The converter has always worked flawless until the last couple of weeks.

I think it's tranny and converter related.