Someone on our enthusiasts forum can give you an answer if you post the question and give them a few more details. 2WD or 4WD etc. Many members have Chiltons or factory repair manuals.
www.trailvoy.com
9 hours
It pays 8 or something but you can easily do it 3 hours if you've done it before prolly 2 or 2.5
i got quoted 12 hours
It is well documented in our forum at www.trailvoy.com It takes a few hours to complete and should probably include a water pump change if your truck is older and you plan to keep the truck for any length of time.
Total repair is @$380.00 1.8 hours for labor plus parts.
about 3 hours
4 to 5 hours
It can take between five and eighteen hours to change an automatic transmission in a Dodge Neon. It may take more time than that, it all depends on the person or group of people working on the change.
approx. 4 - 6 hrs peace
Mitchell labor estimating guide for a 99-2000 silverado 4wd 4.9 hrs and with skid plate add .2 engine and trans combos would make a little dif
are u sure is the timing chain? because cult it by the timing sensor or the timing auctueror sprocket There is no timing belt on a trailblazer only a single timing chain. After some research I found out that the timing chain is still in service in vehicles that have over 150,000 miles without issues. It does not appear to be a weak link in this very strong Atlas LL8 design. The posted labor to change it out is listed at 16 hours. Not really a driveway job but based on history not a problem on these trucks.
21/2 hours if you know what you are doing