I was considering going with the 65 because of the larger size and potentially higher CCA. In my experience the larger batteries seem to last longer and perform better than the smaller ones.
Has anyone converted over to a Group 65 battery? I have the top-post adapters. The battery tray looks too small for a Group 65 though. I was thinking of grinding out the lip or taking a tray out of a different vehicle and adapting it to the GMC's bolt pattern. 1998 K2500.
I have a hunch the fuel filter has never been replaced. I bought the truck surplus from my job and I see no records at all for a fuel filter. I'm going to replace it first and see what happens.
I have a similar concern on my 1998 GMC K2500 Suburban with the 5.7. Noticeable engine tick at idle and under light load. Compared to my other vehicles with lifter tick it sounds different, a bit deeper in both tone and location. But it's rhythmic with half engine speed, so it's most likely a...
I suggest you do a fuel pressure check. If you get full fuel pressure at initial prime but it quickly drops off then you have a "leak" of sorts in the fuel system, and it is likely leaking back to the tank.
My 1998 K2500 is having a slightly similar problem with losing fuel pressure prime. If I...
Your brake fluid looks quite low. Check your brakes, if you have lots of pad material you probably have a master cylinder leak.
If you have a lot of miles on the vehicle it may be worth it to do both the master cylinder and the hydroboost unit at the same time. Take a look underneath the dash...