LS6 TH400 transmisssion

[Ziggysdad]

My Ls6 has the original drivetrain with a TH400 and 3.31 rear. It seems like this converter has much more slippage then what I would think normal. At 60 MPH I am taching 3000+/-. Is this normal? Everything shifts properly and under WOT it does not shift until 6500rpm/ Fluid is pink and clean with no burning what so ever.

[WILMASBOYL78]

Assuming you have a stock converter and stock tire size your RPM's at 60 mph with 3.31 gear should be less than 3 grand...more like 2600-2800 from my experience.

wilma

[Ziggysdad]

Car is absolutely stock and original. Tires are repro F70x14 bias ply wide ovals.

[WILMASBOYL78]

Any chance you can try another tach for comparison...maybe just hook up a steering wheel mount unit and lay it on the seat for comparison. Has the car always been like this or has it just started....???

[PeteLeathersac]

And shifting properly means it's not hanging up like a sticking kickdown acts w/ higher revs before the shifts occur?.


~ Pete

[WILMASBOYL78]

Another thought on WOT shift...is 6500rpm's a little high..?? Our L78 auto cars with 3.55 gearing upshift around 6200...maybe it doesn't matter

[nuch_ss396]

On a similar note, anyone know who rebuilds these CX/CY converters to stock specifications?

Nuch

[ORIGLS6]

[ QUOTE ]
My Ls6 has the original drivetrain with a TH400 and 3.31 rear. It seems like this converter has much more slippage then what I would think normal. At 60 MPH I am taching 3000+/-. Is this normal? Everything shifts properly and under WOT it does not shift until 6500rpm/ Fluid is pink and clean with no burning what so ever.

[/ QUOTE ]

Those are my exact numbers with a 4.10 rear.