700r4

[profe56]

Hi folks: I was just about talk about 700r4.
I just install a 305 engine, Quadrajet carb, edelbrock intake,3.42 rearend and 700r4.
And I only have about 11 miles/gallon.
Forgot to say I don't have the lock up.

[clinebarger]

Originally Posted by profe56

Hi folks: I was just about talk about 700r4.
I just install a 305 engine, Quadrajet carb, edelbrock intake,3.42 rearend and 700r4.
And I only have about 11 miles/gallon.
Forgot to say I don't have the lock up.

The lock-up needs to function!! The Planetary gear sets oil through the lock-up circuit while in 4th gear. A long hot trip in 4th can destroy them.

[Bigdav160]

Originally Posted by clinebarger

The lock-up needs to function!! The Planetary gear sets oil through the lock-up circuit while in 4th gear. A long hot trip in 4th can destroy them.

I'm not at work and do not have any of my books with me.

No disrespect meant but doesn't the cooler circuit come off of the converter clutch valve? For all gear ranges? not just fourth?

I don't remember if the cooler circuit is restricted during lock up or not.

I'll agree that overdrive transmissions need a lockup converter (in OD) to reduce the chance of overheating the fluid. This is especially true in heavier vehicles.

[clinebarger]

Originally Posted by Bigdav160

I'm not at work and do not have any of my books with me.

No disrespect meant but doesn't the cooler circuit come off of the converter clutch valve? For all gear ranges? not just fourth?

I don't remember if the cooler circuit is restricted during lock up or not.

I'll agree that overdrive transmissions need a lockup converter (in OD) to reduce the chance of overheating the fluid. This is especially true in heavier vehicles.

That's correct, The lube circuit is routed through the TCC apply valve in all gears, But there is a "restricted" & a "full-flow" path for the lube/cooler circuit. The "full-flow" path is only open when the TCC apply valve is in the stroked position.

The Lube/cooler gets its oil from the pressure regulator valve......It provides plenty of fluid in all cases except 4th when pressure is reduced.

If you run in 4th with the converter un-locked, It effectively "double restricts" Lube/Cooler flow.

This is the reason if you run a Non lock-up converter, A aftermarket Lube Valve is required to correct flow. TransGo 7-CCV for example.