They made a running change to the pumps in late 03 or in 04 and from there all the service replacements were new style. The tstat was not available from GM on the old style....probably why they changed the design. So.....the aftermarket charges more for the housing and tstat than for the tstat only. Besides, the older style was such a bad leaker that most of these trucks (half?) have the new style now anyway.
...haha still rockin the original pump/thermostat ... after 140k on truck AND our tahoe
you can buy replacement stats for old style, they are just like $40 instead of $7
blown transmissions are about as useful as 97% of the guys on this forum
Mine was only leaking from the gaskets which is common but I didn't want the front bearing to fail later and destroy something under hood.....seen that before too...
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