Best "test" to see if transmission is slipping or not?

[Jan Larsson]

I'm concerned my transmission might (or hopefully not) be slipping ... rebuilt the engine and the transmission been sitting (with oil in it) in the garage for 2+ years before being reinstalled (with new converter, oil/filter change) but felt a bit "weak" when I first started it, topped up the oil properly and felt better but not 100% sure as I've not driven it for so long ...

What's a good "in-car test" I can do to feel if each gear works properly?

 

[bison]

If it slipped the fluid would smell bad. It would only have to slip once at WOT and you would be able to smell it.

 

[Jan Larsson]

So even with new fluid it would smell if it was slipping on 1st, 2nd or 3rd for instance?

Not done a WOT as I got a newly built engine in there and only driven the car about a mile or so sofar and only up to 3rd ...

Just thought it felt a bit powerless in 1st when I drove up on some ramps recently but did not want to rev the engine too much at the time, topped up the trans fluid after that as it was a bit low and just want to make sure the transmission is ok ....

 

[Lee Thompson]

Just my opinion

I am a firm believer that you need to take it easy for quite a few starts before going WOT with new clutches. I just recently had my truck trans freshened by one of the best 4L60 builders in the US. The more I drive it the better it shifts. When I first picked it up I could not really tell much difference--definately better shifts now which is a week later.

 

[Silver Fox]

So even with new fluid it would smell if it was slipping on 1st, 2nd or 3rd for instance?

Not done a WOT as I got a newly built engine in there and only driven the car about a mile or so sofar and only up to 3rd ...

Just thought it felt a bit powerless in 1st when I drove up on some ramps recently but did not want to rev the engine too much at the time, topped up the trans fluid after that as it was a bit low and just want to make sure the transmission is ok ....

Jan,

What stall converter did you put in?

 

[JDSfastGN]

I am a firm believer that you need to take it easy for quite a few starts before going WOT with new clutches. I just recently had my truck trans freshened by one of the best 4L60 builders in the US. The more I drive it the better it shifts. When I first picked it up I could not really tell much difference--definately better shifts now which is a week later.

Ive definitely noticed this on my rebuilds as well. Almost all of them start to shift firmer after a hundred miles or so.

 

[Jan Larsson]

Only engine been rebuilt NOT the transmission (just fluid, filter and new converter). Converter is a Pats stock with antibaloon plates rated at 3000 stall probabrly more like 2800 I would guess (from fullthrottle.com see http://www.fullthrottlespeed.com/it...3EEVERESTE7ECFE4EE}~ic~6001202XHD~eq~~Tp~.htm) .

Transmission where rebuilt about 10k miles ago ... new clutches only and have not been raced since.

 

[Alky V6]

I am a firm believer that you need to take it easy for quite a few starts before going WOT with new clutches. I just recently had my truck trans freshened by one of the best 4L60 builders in the US. The more I drive it the better it shifts. When I first picked it up I could not really tell much difference--definately better shifts now which is a week later.

+1

It follows the same principle that brake pads need a breakin or bedding in procedure before being put to hard use.

 

[Gregaust]

If your new converter is higher stall than before that will give a softer type shift at lower rpm's