Electronic Transmission Control

[nacelp]

> The stock HD (Vette/Trans Am/Z-28/Formula etc) 700R4/4L60/4L60E is rated
at
> 375 ft/lbs...lesser standard duty 700's (S-10 etc) at 325 ft/lbs...

CA, HP.  My 325 HP SBC ate several 84 MY versions.

> Note that the mid 1988 and later 700R4...4L60...and 4L60E's are
essentially
> identical with the exception of the E's electronic controls...

When I changed to a 89 core, they lasted much longer.

> 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...

Again, CA HP.

> Not sure about the stock 2004R's torque rating except that "stock" it's
> somewhat less than the "stock" 700 family...remembering that "stock"
T-Types
> and GN's aren't that quick...

Ya, right, but with a little tuning run 12s, and the trannies last in stock
form.  How many easily tunable 12 sec applications were the 700s used
in?......

now a aftermarket 2004R can be built to be
> similar in torque capability to a aftermarket 700...and the fast GN's etc
chew
> them up regularly...

Try, some more research.  A fast GN is what low 11s high 10s, how much work
would a 700R take to live in those conditions?......

> I've run a aftermarket (Toy Shop in LA, CA) 700R4 in my 71 Vette with a
"warm"
> 400hp...455ft/lbs...406ci for seven years and counting...it's ran a best
of
> 12.87/112 mph on street tires...many passes and no trans
problems...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?)...

There are lots of 500HP Gns doing very well with 200R4s with hardened
shafts, and a updated converter.
>
> The wide ratio 700 can be a advantage in a street car (good off the line
and
> easy cruise)...and a disadvantage in a race car (rpm recovery too
low)...but
> keep in mind that the 2004R is actually a wide ratio box as well (compared
to
> the standard TH-350 and TH-400's) though it's ratio spread isn't as wide
as
> the 700's...I'd venture that the same car (with optimized rear gear)
should be
> a tenth or two quicker with the 2004R...

Xactly
Grumpy
>
> 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
>
> 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...
>
> As far as living behind a 300HP 350ci...either member of the 700 family or
the
> 2004R would be the best bet...
>
> Regards...
>
> Doug
>
>
>
> MysticZ wrote:
> >
> > Swayze wrote:
> > >
> > > this is not an answer, but another question.
> > > which of the later OD  GM trans should I look for,needing only TCC
and
> > > 300HP+ survivability in a street driven car; 700R4,200??,4L60?,4L80?
(BOP)
> > > my trans knowledge is from the twospeed TC powerglide days.
> >
> > My 4L60E isn't complaining about 350 horsepower or 400 foot pounds. It's
> > not the horsepower that trashes a tranny, it's the torque. But with 300
> > HP, you shouldn't have a problem with a 700R4 or 4L60E. The -80E weighs
> > a ton and the rest have no overdrive, so I'd stick with the 700R4/4L60E.
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