Electronic Transmission Control

[Tom Sharpe]

<snips>

Doug Dayson wrote:

> Hi All...
>
> Note that the mid 1988 and later 700R4...4L60...and 4L60E's are essentially
> identical with the exception of the E's electronic controls...
>
> The aftermarket can add "beef" to the 700 family to approximately 450 ft/lbs
> (TCI/B+M)...475ft/lbs (Premier Performance/Toy Shop)...and 500ft/lbs is
> claimed by Art Carr...
>
> Not sure about the stock 2004R's torque rating except that "stock" it's
> somewhat less than the "stock" 700 family...

Any one claim that a 200R4 can handle 500+ FT LBS.  HOW MUCH CAN IT HANDLE???

> .however a
> friend's 89 Vette equipped with a 535ft/lb Lingenfelter Super Ram'd stroker
> can't keep a 700R4 in one piece for long with Drag Radials...he's thinking
> 4L80E (if it'll fit?)...
>

> Ratio comparison...
>
> 700R4/4L60/4L60E ratio's...3.06...1.62...1.00...0.70
>
> 2004R ratio's...2.75...1.57...1.00...0.67
>
> 4L80E ratio's...2.48...1.48...1.00...0.75
>
> TH-400 ratio's...2.48...1.48...1.00
>
> TH-350 ratio's...2.52...1.52...1.00

from th '60s (and still valid), you need ~ 12.5/1 in first w/ small slicks or drag
radials.

> The 4L80E is perhaps the best bet from a racer's or towing standpoint as it's
> got the closest ratio spread and it's torque capacity is the highest...but
> it's physically longer and slightly larger in diameter than it's cousin the
> TH-400...and it weighs 100 lbs more than the others excepting the TH-400...and
> it's parasitic drain is about 50HP more than the others...
>
> Also of note concerning the 4L80E's...I've heard that their sprags are weak
> compared to a TH-400's...fortunately the TH-400 sprags will retrofit...

I'm running a T350 and 10" converter and 2.75 axle because 700R4's annual costs
are too high.

TomS

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