STD C6 converter acting like a high stall? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

dezza · 04-24-2007, 06:18

I need some advice on a standard stall converter in my c6 auto that seems to be acting like a 3000 high stall. The gearbox has been fully rebuilt except for the torque converter and works well except for stalling up to about 3200 rpm and seem to be worse when cold. After start up when cold it revs to about 2500 just reverseing out the driveway which is abit uphill. Could it be that the converter is stuffed or maybe other problem? Car info is 75 F100 4x4 with 393 clevo, 2v well ported heads, edelbrock torqer manifold, 214-224@50 cam, rollers ect. Gearbox has extra clutches,R code billet servo,shift kit, 4.11 gears 39 inch tyres. I dont really mind the stall speed as it launches well but I do a lot of 4x4 driving and tow a big trailer and this slipping becomes annoying. Any ideas would be a help.

Sand1 · 04-25-2007, 21:02

If it wasnt doing this before the rebuild, I would think something needs adjusted in the tranny. Using the old convertor on a new rebuild isnt recommnended at all. That is unless you know without a doubt that it is in very good condition and very clean.

Most transmission shops will advise you to install a new convertor with the new build. It could be that the convertor is weak. It really shouldnt be doing that. The problem is, when its doing that, its creating a lot of heat. And heat is a transmissions worst enemy.

I would go back to the shop that rebuilt it and see what they have to say. I would also spring for a new convertor. Which reminds me, I need to order a bigger stall for mine lol.

dezza · 04-26-2007, 03:56

Thanks for the info. I am not sure if it was doing it before as I converted it from manual to auto and got the box from a wreckers condition unknown. I rebuilt it myself and being short of funds thought I would risk it using original converter. I think that gamble has not payed off.

Sand1 · 04-26-2007, 04:20

Its not a total loss. The tranny may just need some adjusting. I would go ahead and buy a convertor to stick in it while I had it out though. Take it to a shop and have them check it out for you. It may not cost that much since you already have all the new stuff in it.

I'm thinking the bands may not be adjusted right. They could check that easy enough. The pump could be weak too. It might cost a little more to get it right, but you will get it.

dezza · 04-28-2007, 20:31

The Band is right but I think I should get a oil pressure guage and check pump pressure as you say. The pump looked fine in rebuild, but thought it would shift harder with the shift kit and R code billet servo but it only shifts like std box. Maybe pressure is down.