transmission lag

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May 15, 2003 | 08:46 PM

lexoman

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From: California

transmission lag

i have noticed under heavy acceleration my car has started to lag between gears seems to be getting worse,shift points dont feel right,feels like fuel is being cut off for a second between gears under hard acceleration,checked trany fluid seemed ok.do i need trany service?,would bad spark plugs cause this.
need some help before i take her in.thanks
99 gs400 65000 miles.

May 16, 2003 | 11:38 AM

PHML

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From: Waipahu, Waikele, HI

Time for a tranny flush. I would also consider changing the timing belt, differential fluid, motor oil (Mobil Synth 5W-30), possibly the plugs too, etc...... At 65K miles and under heavy driving....it makes sense.

Pete

May 16, 2003 | 08:21 PM

lexoman

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From: California

had trany serviced,appears rmm tc is slipping,i can hear a short sqeal when car shifts from first to second,has this happened to any one else?,i bought the car used with rmm tc installed already.does rmm warranty there tc.and how much will a stock tc cost me.

May 16, 2003 | 09:22 PM

TTurboPimp

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From: Maryland

lexo, I think Im having the same problem with my RMM tc. Same deal, I bought the car with it on already, has low miles on it though. At first I thought it was the tranny slipping, but Im really leaning towards it being the TC. If my tranny was slipping like it did a few days ago, then it would still be slipping. It has been acting fine on and off, the tranny wouldnt just fix itself spuratically. I really think its the TC, but Im not sure how a shop would go about determining this. Does anyone know how to tell if a TC is slipping?

There are times when I first drive the car after sitting that it slips real bad for a the first 20 feet or so then its fine. Almost like its not getting fluid to it immediately, or something like that.

May 17, 2003 | 08:06 PM

roenick7

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From: CA

Ok I have the exact same thing 2 weeks ago I went to Matt at Under Pressure. He drove the car and thought it was the Tranny. Maybe the T/C , either way I have 375 HP to the wheels w/o NOS so I am having a tranny built. It should be done in 5-7 days now. They are going to pull the RMM T/C and check before reinstalling in the new tranny.

I will let you guys know. This question with the RMM T/C has come up before.

My slipping is hard excelleration between shifts, more so in "D" rather than the triptronic. It has also made a high pitch noise between shifts 2-3rd gear. I change the tranny fluid every 3000 miles along with Mobil One 5/30 and rear diff fluid. $$$

May 17, 2003 | 09:14 PM

Mr Johnson

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From: Illinois

Hmm.... How many miles do you have since installing the TC?

roenick7: Every 3K miles you flush the tranny?

I follow a slightly *ahem* less rigorous schedule though still more so than usual. Every year or 10K miles I'll do those services. I've got almost 20K on the car with TC and a touch more RWHP. No problems yet. "Knock on wood".

I'm curious to hear what the outcome of the inspection is. BTW: Who's doing the rebuild and what's involved?

Last edited by Mr Johnson; May 17, 2003 at 09:16 PM.