Hi. I I got a 09 silverado 1500 5.3 4spd and I plan on installing the transgo hd2 shift kit. Sonnax pinless accumulator pistons for 1-2 3-4 and the vb forward one, and corvette servo and a sonnax billet 4th gear servo, and front pump / converter seal. I read the valve body gaskets in the kit don't work with the nnbs so I need to see if the dealer can get them. I I also plan on getting a yank truck thruster 3000. My question is should I do it all at once or do the shift kit stuff first incase there's an issue. Also what parts am I missing? the front pump seal is seeping so I figured if im gonna drop the tranny ill build it a little.

 

If i was to do it, id do everything at once. Screw doing the shift kit, seal and not slap the converter in.

 

What else should I do while I'm at it? I'm not a professional transmission builder but I've played with valve bodies before. I want to have every thing I need to have no down time.