Iv almost finnished installing a ( Doug Nash ) US Gears overdrive into my 66 F100. It is a .8 overdrive. the engine is a
352 4bl C6 3.07 Gears and 29 in tires. going to pickup the one piece Drive shaft tomorrow. All the rest is installed. Soooooooooo
A question about Tq converters and stall speed. The Tq converter I have is a stock one and I figure with the overdrive my highway RPM at 65mph to be around 1850 -1890 some where in there. Is the stock Tq converter going to
be ok or should I be looking a lower stall converter. The C6 Does have a shift kit in it. and will stay in whatever gear I select or shift thru the gears in Drive.

Anybody that could shed some light on this stall speed thingy ?

 

I show you running about 1707 rpm.

Novak Conversions - Gearing & Gearing Math for Jeeps

Stock stall speed may be just about 1700 or so, depending all the variables. This outfit sells tcs, talks about them etc:

TCI - TORQUE CONVERTERS: Descriptions

You sure you have a C6? C6 was not OEM in your truck.

 

It is a C6, I had it installed to replace the ageing manual 3 speed overdrive
that came with the truck.and as im also ageing i like the auto better

Is the stock Tq converter going to be ok then ?

 

I don't know the exact stall--it will not be much higher than 17-1800, gotta tach?

 

I sure Do