Sorry guys, Mr. Cummins and Mr. Adrian have gently corrected me. The 4L80E
is the tranny that is based on the old TH-400. The 4L60E is the 700R-4,
and is a newer design that is not as heavy duty as the 4L80E. It sounds
like the 4L80E is the 3/4 and 1-ton tranny. Now I get to go back and tell
my friend at the local "auto recyclers" that he was wrong. So how much
stronger is the 4L80E than the equivalent 4L60E/700R-4? What are these two
transmissions rated at for torque/hp? My 88 1/2-ton has the 700R-4, and I
have done a lot of towing with it. My 86 Blazer (full-size) also has this
same tranny. I have had really great luck with both of them. Is this a
fluke or is the 86 and up 700R-4 that much better? Thanks again for
correcting me, it only hurts a little =^).
Kevin Lake
56 GMC Suburban/napco
----------
> From: w cummins <wac@gene-o-tech.com>
> To: Kevin Lake <lakek@oit.edu>
> Subject: Re: [oletrucks] '59 Chevy 3/4 ton tranny?
> Date: Sunday, April 18, 1999 12:04 AM
>
>
> -----Original Message-----
> From: Kevin Lake <lakek@oit.edu>
> To: Bruce Ford <Booomie@worldnet.att.net>; Bob bdfentr
> <bdfentr@zeus.symet.net>; 'Chevy Trucks' <oletrucks@autox.team.net>
> Date: Saturday, April 17, 1999 9:44 PM
> Subject: Re: [oletrucks] '59 Chevy 3/4 ton tranny?
>
>
> >
> >The 700R-4 is the 4L80. GM came out with the TH-700R-4 in the early
1980's
> >(1982 if I am remembering my GM history). It is similar to the old
TH-400,
> >but with a lock-up torque converter for the added fourth gear. In about
> >1990 GM added the 4L60 designation, as far as I know there were no
> >physical changes to the transmission. In about 1992 or 1993 they added
> >electronic control and it became the 4L60E and the 4L80E, I have been
told
> >that the difference between these two is mainly shift points and the
torque
> >converter. The 700R-4 is a very strong transmission, but you have to
take
> >a few precautions with the earlier transmissions: 1) You must not tow
in
> >Over-drive. 2) You must change the filter and fluid on a regular basis.
3)
> >And it is a VERY good idea to add an extra transmission cooler.
>
>
> nope the message below is correct the 700R became the 4L60e and was
> NOT based on the TH400. The 4L80E is based on the TH400
> the 700r is not a HD tranny at all infact GM had tons of problems with
> them
> for years the 4L80 is a HD tranny, the tranny in your 88 chevy is the
> later model
> 700r ( after 86 they got better stuff in them)
>
>
> >----------
> >> From: Bruce Ford <Booomie@worldnet.att.net>
> >> To: Bob bdfentr <bdfentr@zeus.symet.net>; 'Chevy Trucks'
> ><oletrucks@autox.team.net>
> >> Subject: Re: [oletrucks] '59 Chevy 3/4 ton tranny?
> >> Date: Saturday, April 17, 1999 11:32 AM
> >>
> >> Another option, besides the 700, would be a 4L80 or 4L80E, which is
> >basically a TH400 with an overdrive. The is an electronic controlled.
> >They are much more durable than the 700s. Everyone I talk to say that
the
> >700s will break no matter what you do to them. Just another option.
> >Also, in rebuilding my rear for my monte carlo, I was able to replace
the
> >axles, posi unit, ring and pinion for all under $1000. So that might be
> >another good option.
> >>
> >> Just some thoughts....
> >> Bruce
> >>
>
>
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