Trannyman

Prior to me rebuilding my trans, I had the wbody shift kit with a DHP 1.5 file. When I'm driving around 38 mph, I could hit the performance shift button and get the downshift from 3-1 and get that nice firm quick shift from 1-2. For some reason, if I try to do the same thing with the transgo shift kit at 38 mph it feels as though the trans downshifts fine and the car lags for a sec and then it takes off. Its as if the RPM's jump to 5500 rpm or say and the car doesn't accelerate at all for a second and then it pulls. It reminds me of a turbo setup where it takes a second for the turbo to spool up and then it starts to pull. It might also be the car is hanging onto 1st to long and then shifts into second.

Any ideas what it might be? If I take off from a stand still, the car shifts great and doesn't slip at all. Prior to me modding my car, I never experienced the DHP 1.5 without the wbody shift kit. I put all my power mods on the same day so it was quite the improvement over stock. So what I might be describing is normal, but I really miss that firm shift.

Any recommendations on how to firm up the shifts. I would prefer to still utilize the transgo kit as it looks like a higher quality kit than wbody stores kit or zzp kit. I'm assuming the accumulator 1-2 spacer should be changed to be more in line with wbodystores size.

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1997 Black GTP 72k (4dr), 3.5 Pulley, Wbody Downpipe, Wbody Shift kit (street), DHP 1.0, NGK TR55ix Spark Plugs, GMP Handling kit, KYB AGX Struts, AT Italia Inox 235x50x18 Bfgoodrich KDWS, GMPP Springs, Corvette C5 Calipers, Blazertech 3200, DHP Powertuner (97-03), Built Trans, Torsen Diff

As I mentioned earlier the Transgo kit is not a performance kit and isnt going to produce a firm shift because it wasnt designed for that. What you can do to help out the 1-2 firmness is to add a spacer on top of the 1-2 accumulator inside the small spring just like the Transgo instructions show for the 2-3 accumulator and also how your wbody store shift kit spacers are set up. The long spacers on the bottom should be the same or an identical lenght so you shouldnt have to change those. So what you are saying the car does is at a 38mph WOT kickdown into 1st it DOES shift down but feels like the car is just freewheeling sitting at 5500 and then grabs after a second? That almost sounds more like a pressure or weak sprag problem. Are you using the same pcm that you had before you rebuilt the trans or is a different one? Tuning can really help out things like this if you have someone who has a tuner. You can try adding the spacer and it should help firm up the 1-2 a little bit. Outside of tuning to help out the other option is to take the valve body back off but Im sure you dont want to go through that again!

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My fuel pump just died this morning, so that could have been my issue with the skip shift. I'm assuming maybe the pump wasn't able to build fuel pressure quick enough for the 3-1 downshift which caused it to hesitate for a second and then it would go.

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1997 Black GTP 72k (4dr), 3.5 Pulley, Wbody Downpipe, Wbody Shift kit (street), DHP 1.0, NGK TR55ix Spark Plugs, GMP Handling kit, KYB AGX Struts, AT Italia Inox 235x50x18 Bfgoodrich KDWS, GMPP Springs, Corvette C5 Calipers, Blazertech 3200, DHP Powertuner (97-03), Built Trans, Torsen Diff