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I just had my trans go hd2 and servos installed and from 1st to 2nd gear slams your head against the seat but the rest of the gears shift perfect. would a retune fix this problem or do i need the transmission people to drop the line pressure? it should be stock line pressure
Put the line pressure back to stock in the tune. How many washers did they put in the servos?
I have a HD2 and vette servos and with the stock pressure settings in the tune it is perfect.
the tune is from nelson and i didnt have any tranny mods when i got it so i figured the he didnt change the line pressure from stock and the tranmission guy didnt change it so i figured it was stock still
How many washers did he put in?
my WT does the same thing, i have jacked up line pressure but i added 2 washers or 1 i cant recall and man its hell on the 1-2
Did your builder install the 1-2 Accumulator Valve Spring that came with the kit. Mine did the same thing,this's a vid on there about how bad is was, I have to pull the valve body and install the stock spring. If most don't know the 1-2 accumulator valve spring is small about one inch long, that controls the line pressure going to the 1-2 accumulator on the side of the case. I had to install a new spacer plate and not drill out 2nd gear hole, install stock 1-2 accumulator valve spring, install stock accumlator springs with no washers, with stock tranny pressure in tune just to get mine to shift ok, still barks 2nd wot. I think it is my carbon firber band.
http://i545.photobucket.com/albums/h...ics/405111.gif
the 1-2 valve spring is 370 or you may have the valve 372 upside down witch would cause very hard 2nd apply
if it's a nelson tune, can almost guarantee he bumped up the shift pressure...unless you asked him specifically not to. Have him set it back to stock.
Yep I agree everything I tune I give it more line pressure makes stock tranny shift so much better, better shift quality and feel.
BB
yeah its a nelson tune i changed out my tune with my stock computer and it fixed it its got nice firm shifts but the 1-2nd is neck snappin anymore so must have been tune
mine shifts hard from 1-2 with 10psi still added in the tune. i dont even have the hd2 just the vette servo. like they said above just set the pressure back to stock. either add pressure manually (shift kit) or electronically(tune) not both imo