Broke the flexplate on my 97 K1500
have a 375HP 383e stroker installed 25k miles ago
do a LOT of towing, almost exclusively used to tow with.
while the trans is out, replaced the trans front seal, even though there
were no leaks. Engine rear main seal is fine.
Torque converter looks fine, old trans fluid looked/smelled a little
burnt, but not bad and was due for a change anyway
Thinking of replacing the TC with a low stall unit, just on GP.
Or should I just throw the old one back in?
I'd stay with stock. Unless that trans has had some work it is likely
borderline with that engine. Don't want even more torque through it.
If that trans has not been apart, I'd be tempted to open it up and do
all the recommended upgrades to it now. Like a better sun shell, bore
and sleeve the valve body, replace the clutches and steels. Of course if
that was already done, don't bother.
As for the flex plate, use a HD aftermarket unit and check the trans
Turns out the flexplate was completely broke at the center hub. It also
shows signs that it had been damaged for a long time. Multiple cracks
and some bent parts.
The good news is that the torque converter is fine and is a low stall
speed unit, 1397rpm stall. It also had zero sign of damage and looks
like a new one. Fluid was just slightly dark and with a very slight
smoky smell, but nothing serious. Took the old trans filter out and cut
it apart to find... nothing. No metal shavings, no dirt, not even dirty.
Put in a new filter and after completely allowing the converter to drain
out, put in 11 quarts of new fluid and reassembled the parts and with a
few tries at properly shimming the starter, it starts, shifts and runs
like new. Also replaced the trans front seal, which was a real bitch to
take out but went back in like a hot knife through butter.
Next on the agenda is to drain and refill the transfer case, but there
wasn't enough time to do it today. Next week. Also going to put in an
aftermarket trans fluid cooler. Every little bit a lower heat helps,
right? Maybe a trans fluid temp guage too.
Thanks to everyone who offered advice. This group rocks.
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