I got 73K on the Odo on my 1997 Yukon, 5.7Vortec. Got the 4L60 tranny (I
think?) ...so far no sunshell issues, but have a odd "weight shift forward"
sensation when I come to a dead stop? Tranny Guy tells me that it's probably
one on the valves (can't remember the acronym he used for it?) ...recommends
a shift kit , states It upgrades the valves/modules and improves the tranny
performance??? Wants approx. $250 to do the job?
Any comments from the group? Would appreciate your help!
because anytime you mess with shift timing and /or clutch and band apply
rates, you are asking for codes to be set
the ECM is looking for ratio changes within a certain time after commanding
a shift, get too far outside the programmmed values and it's 'Check Engine
if you do the overhaul and install of the kit at the same time, you can
follow the kit manufacturer;s recommendation for clutch pack clearances to
avoid any conflicts
as far as the actual kit goes, I'd suggest the Superior 4L60E
kit.......simple to install, crystal-clear instructions
I asked another Tranny company today regarding the "shift kit" and they
agree with Gary...waste of time and asking for shift timing problems, etc.
They explained that the "weight shift" I described is from the lack of lube
in the driveshaft splines (they dry out) and the DS
releases/suction/pops-loose from the yoke after I come to a stop...they
described the sensation exactly!! Like someone tapped your rear bumper from
behind! They recommended a fluid change and to service the splines with a
better quality lube than OEM....around $100 and to skip the shift kit!
I've heard a lot of people having good experiences with the
Trans-Go kits. I think the older 98 and below 4L60's benefit
the most. The new ones are real picky with how they operate,
and the computer steps in to try and make it operate how it
'thinks' it should, and will sometimes throw codes.
If you check out a site like:
-They give you some info on what part/kit does what.
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