I also forgot to mention that the Painless and TCI kits come with a low
vacuum switch that cuts out the torque converter under acceleration or
all-out foot to the floor. This is the way GM hooked it up for many years.
The switch is available at the auto parts store, sorry, I don't have a part
number handy.
----- Original Message -----
From: Keith <kvdurand@mail.esc4.com>
To: <oletrucks@autox.team.net>
Sent: Thursday, July 27, 2000 8:16 PM
Subject: Re: [oletrucks] 700R4 LOCKUP TORQUE CONVERTER?
> On my 700, I wired it to go into lockup as soon as it goes into 4th. I
also
> ran a wire straight out that will lock it in 2, 3, or 4 when power is
> applied. Both of these go to a switch on the dash. The connector has 4
> pins, so it can be rigged many ways. The $100 lockup kits are not worth
it.
> The B&M (even more expensive) kit locks the convertor at speeds over 43
mph.
> This is not necessarily the best way. The Painless and TCI kits lock it up
> in 4th. Both kits give good diagrams and options for locking in other
gears,
> locking manually, etc. The lockup convertor was for mileage, and really
> can't stand much abuse. The tranny's 4th gear is also not designed for
> abuse. 4th gear, especially on stock units without pump passages enlarged,
> starve the rear planets for lube when locked up. One purpose of the
throttle
> valve is to kick the tranny out of 4th at high speeds. The Corvette 3-4
> shift valve and the B&M counterpart risk really screwing up a tranny by
> keeping it locked in 4th at high speeds. The 700 is a great tranny, but
> shoudn't be abused. Use 4th for mileage, and 3rd for fun. As has been
> stated before, the TV cable has to be hooked up right, or the tranny is
> toast. Also, the comment about a 400 with overdrive is not quite correct.
> The 400 is much stronger than any 700. The 4L80E shares 3/4 of its parts
> with the 400. The 4L60 (aka. TH700-R4) and 4L60E are not so fortunate.
> Anybody that can afford the 4L80, have fun. I wish I had those resources.
> Complete, it will run about $2500, but it is indestructible. It is also a
> computer controlled trans.
>
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
|